cas 110-88-3, 1,3,5-trioxane | Articles data

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The salt effect on the yields of trioxane in reaction solution and in distillate
Batch reaction experiments were performed to investigate the salt effect on the yield of trioxane in the reaction solution. The salts considered include NaHSO4, Na2SO4, NaH2PO4, Na2HPO4, KCl, NaCl, LiCl, ZnCl2, MgCl2, and FeCl3. The effects of the anionic structure and the cation charge density on the yield of trioxane in the reaction solution were elucidated and the mechanisms that govern such effects were established. It is shown that the first four salts exerted a negative effect on the yield of trioxane in the reaction solution and such an effect increased progressively from left to right. This trend is due to the formation of NaHSO4, H3PO4, or (H3PO4 and NaH2PO4), which decreased the concentration of H+ in the solution. The latter six salts showed a positive effect on the yield of trioxane in the reaction solution. The salt effect paralleled the ability of the salt to decrease the water activity of the reaction solution and followed the order KCl 2 2 3. Continuous production experiments were performed to investigate the salt effect on the concentration of trioxane in the distillate. The salts considered were KCl, NaCl, LiCl, ZnCl2, MgCl2, and FeCl3, and the salt effect increased progressively from left to right. Such an effect was shown to be determined by the ability of the salt to increase the yield of trioxane in the reaction solution and to increase the relative volatilities of trioxane and water and of trioxane and oligomers.
Yin, Liuyi,Hu, Yufeng,Zhang, Xianming,Qi, Jianguang,Ma, Weiting
p. 37697 - 37702
(2015)
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Influence of Silanol Defects of ZSM-5 Zeolites on Trioxane Synthesis from Formaldehyde
Abstract: The silanol defects in ZSM-5 zeolite have been recognized as an important factor in catalytic activity. Here, ZSM-5 zeolites with different amounts of silanol defect sites were synthesized from synthetic gels containing fluoride medium and were applied as catalysts for trioxane synthesis. The results of XRD, SEM, NH3-TPD, Py-IR, OH-IR, 27Al MAS NMR, 1H MAS NMR, and TG indicated that all ZSM-5 zeolites showed similar crystal size, relative crystallinity, porosity, and the number of Br?nsted acid sites. However, the silanol defects reduced obviously and the number of Lewis acid sites reduced correspondingly when a little NH4F was added in the synthesis gels and both of them decreased slightly with increase of F/Si ratio. Compared with ZSM-5 zeolite prepared in hydroxide medium, ZSM-5 zeolite prepared in fluoride medium displayed higher selectivity to trioxane and increased gradually with increase of F/Si ratio. Moreover, the lifetime of ZSM-5 zeolite prepared in fluoride medium was longer than that of prepared in hydroxide medium. Thus, ZSM-5 zeolite prepared in fluoride medium which contained the few silanol defects and low Lewis acid sites is an efficient catalyst for trioxane synthesis. Graphic Abstract: [Figure not available: see fulltext.]
Ye, Yuling,Yao, Mengqin,Chen, Honglin,Zhang, Xiaoming
p. 1445 - 1453
(2020)
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Study of trioxane production process with super- or subcritical fluid as solvent and extractant
A super- or subcritical fluid was used as a reaction solvent for nonaqueous trioxane synthesis instead of common organic solvents. The generation of trioxane from paraformaldehyde was observed in the presence of the catalyst when carbon dioxide reached a supercritical region, suggesting that the supercritical carbon dioxide acted as the reaction solvent. In the case of Freon 12, the trioxane was effectively produced even in a subcritical state. Copyright Taylor & Francis Group, LLC.
Tanaka, Michio,Ogino, Kenji
p. 1927 - 1932
(2006)
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Fixation and spontaneous dehydrogenation of methanol on a triruthenium-iridium framework: Synthesis and structure of the cluster anion [HRu3Ir(CO)12(OMe)]-
The anionic mixed-metal cluster [RU3Ir(CO)13]- 1, found to be catalytically active in the carbonylation of methanol, reacts with methanol at 70°C to give, with O-H activation of the substrate, the cluster anion [HRu3Ir(CO)12(OMe)]- 2, which upon prolonged reaction loses formaldehyde to give the cluster anion [H2RU3Ir(CO)12]- 3; both anions 2 and 3 crystallise together as the double-salt [N(PPh3)2]2[HRu3Ir(CO)12(OMe)][H2Ru3Ir(CO)12] the single-crystal X-ray structure analysis of which reveals a butterfly Ru3Ir skeleton for 2 and a tetrahedral Ru3Ir skeleton for 3.
Haak, Susanne,Neels, Antonia,Stckli-Evans, Helen,Suess-Fink, Georg,Thomas, Christophe M.
p. 1959 - 1960
(1999)
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Selective Reduction of CO2 to CH4 by Tandem Hydrosilylation with Mixed Al/B Catalysts
This contribution reports the first example of highly selective reduction of CO2 into CH4 via tandem hydrosilylation with mixed main-group organo-Lewis acid (LA) catalysts [Al(C6F5)3 + B(C6F5)3] {[Al] + [B]}. As shown by this comprehensive experimental and computational study, in this unique tandem catalytic process, [Al] effectively mediates the first step of the overall reduction cycle, namely the fixation of CO2 into HCOOSiEt3 (1) via the LA-mediated C - O activation, while [B] is incapable of promoting the same transformation. On the other hand, [B] is shown to be an excellent catalyst for the subsequent reduction steps 2-4, namely the hydrosilylation of the more basic intermediates [1 to H2C(OSiEt3)2 (2) to H3COSiEt3 (3) and finally to CH4] through the frustrated Lewis pair (FLP)-type Si-H activation. Hence, with the required combination of [Al] and [B], a highly selective hydrosilylative reduction of CO2 system has been developed, achieving high CH4 production yield up to 94%. The remarkably different catalytic behaviors between [Al] and [B] are attributed to the higher overall Lewis acidity of [Al] derived from two conflicting factors (electronic and steric effects), which renders the higher tendency of [Al] to form stable [Al]-substrate (intermediate) adducts with CO2 as well as subsequent intermediates 1, 2, and 3. Overall, the roles of [Al] and [B] are not only complementary but also synergistic in the total reduction of CO2, which render both [Al]-mediated first reduction step and [B]-mediated subsequent steps catalytic.
Chen, Jiawei,Falivene, Laura,Caporaso, Lucia,Cavallo, Luigi,Chen, Eugene Y.-X.
p. 5321 - 5333
(2016)
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Controlling the Product Platform of Carbon Dioxide Reduction: Adaptive Catalytic Hydrosilylation of CO2 Using a Molecular Cobalt(II) Triazine Complex
The catalytic reduction of carbon dioxide (CO2) is considered a major pillar of future sustainable energy systems and chemical industries based on renewable energy and raw materials. Typically, catalysts and catalytic systems are transforming CO2 preferentially or even exclusively to one of the possible reduction levels and are then optimized for this specific product. Here, we report a cobalt-based catalytic system that enables the adaptive and highly selective transformation of carbon dioxide individually to either the formic acid, the formaldehyde, or the methanol level, demonstrating the possibility of molecular control over the desired product platform.
Chatterjee, Basujit,Cramer, Hanna H.,Leitner, Walter,Werlé, Christophe,Weyhermüller, Thomas
supporting information
p. 15674 - 15681
(2020/06/08)

Methanesulfinylation of Benzyl Halides with Dimethyl Sulfoxide
A phenyltrimethylammonium tribromide-mediated nucleophilic substitution/oxygen transformation reaction of benzyl halides with DMSO has been developed. In this transition-metal-free reaction, DMSO acts as not only a solvent but also a "S(O)Me" source, thus providing a convenient method for the efficient and direct synthesis of various benzyl methyl sulfoxides.
Fu, Duo,Dong, Jun,Du, Hongguang,Xu, Jiaxi
p. 2752 - 2758
(2020/01/31)

METHOD OF PRODUCING TRIOXANE
Disclosed is a method of producing trioxane, including: (A) preparing trioxane from a high-concentration formaldehyde aqueous solution in the presence of an acid catalyst; (B) distilling a mixture including trioxane; (C) liquefying the distilled gas mixture; (D) mixing the liquefied liquid mixture with an extraction solvent and separating the mixture into an aqueous phase and a solvent phase; (E) distilling the solvent phase to give trioxane, and mixing the aqueous phase with the extraction solvent to give a mixture, which is then separated into an aqueous phase and a solvent phase; and (F) discharging the aqueous phase separated in (E) out of the system, and recirculating the solvent phase so as to be reused in (D) and (E).
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Paragraph 0039-0041

(2016/04/09)

Method for synthesizing trioxymethylene by cyclic reaction of formaldehyde aqueous solution catalyzed by ionic liquid
The invention provides a method for synthesizing trioxymethylene by cyclic reaction of a formaldehyde aqueous solution catalyzed by ionic liquid. The method comprises the following steps: carrying out distillation reaction to the reactants formaldehyde aqueous solution and ionic liquid under atmospheric conditions at 97-102 DEG C so as to synthesize trioxymethylene; in percentage by weight, the addition amount of the formaldehyde aqueous solution is 30-80wt%, the addition amount of the ionic liquid is 0.1-6wt%, and water accounts for all the remaining percentage; and the ionic liquid is a liquid composed of anions and cations, wherein the anions are p-ClPhSO3-. The ionic liquid formed by 4-chlorobenzene sulfonate as anion is used as the catalyst of the method so as to synthesize trioxymethylene by cyclic reaction of formaldehyde; thus, the catalyst is high in catalytic activity and small in dosage; moreover, the reacted trioxymethylene is relatively high in concentration while the contents of the byproducts, including methanol, formic acid and the like, are low; and the reacted trioxymethylene is also good in selectivity.
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Paragraph 0114; 0115

(2017/01/17)

A three-poly process for the preparation of formaldehyde
The invention discloses a preparation method of trioxymethylene. The method comprises the following steps: delivering a formaldehyde water solution into a reaction kettle, and reacting under the catalytic action of sulfuric acid to obtain trioxymethylene; meanwhile, connecting a liquid discharge pipeline of the reaction kettle to a feed pipeline of a formaldehyde concentrating tower A so that the liquid in the middle part of the reaction kettle is discharged into the formaldehyde concentrating tower A, and recovering formaldehyde; and distilling the liquid in the reaction kettle, and separating to obtain the trioxymethylene. The method can recover the overhigh-concentration formaldehyde solution in the trioxymethylene reaction solution, and enhances and stabilizes the balance and conversion rate of the trioxymethylene synthetic reaction. The method effectively avoids the formation of solids and residues in the trioxymethylene synthetic reaction kettle, solves the problem of blockage of the pipelines and reboiler, and prevents the trioxymethylene production equipment from corrosion. The method implements zero discharge of the trioxymethylene synthetic reaction solution, enhances the raw material utilization ratio and saves the reaction cost. The method is simple and environment-friendly, is easy to operate and control, and relieves the pressure of the sewage treatment system.
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Paragraph 0030-0033

(2017/06/13)

Photocatalytic decarboxylation of lactic acid by Pt/TiO2
A photocatalytic route for the conversion of lactic acid to acetaldehyde in water is demonstrated. Direct UV photolysis of lactic acid yields CO2 and ethanol via a radical mechanism. Pt/TiO2 considerably increases the rate of lactic acid decarboxylation with acetaldehyde, H2 and CO2 as the main products. A concerted photodecarboxylation/dehydrogenation mechanism is proposed.
Liu, Kaituo,Litke, Anton,Su, Yaqiong,Van Campenhout, Bart G.,Pidko, Evgeny A.,Hensen, Emiel J. M.
p. 11634 - 11637
(2016/10/04)

(V)/Hydrotalcite, (V)/Al2O3, (V)/TiO2 and (V)/SBA-15 catalysts for the partial oxidation of ethanol to acetaldehyde
Vanadium-based catalysts have been investigated in the partial oxidation of ethanol to acetaldehyde with the aim of understanding relationship between vanadium structure and acetaldehyde productivity. Hydrotalcite, Al2O3, TiO2 and SBA-15 with and without a 5% of vanadium content were prepared to study the oxidative dehydrogenation of ethanol. They were characterized by XRF, TPR (H2), NH3-TPD, CO2-TPD, RAMAN, UV-vis, Nitrogen physisorption, XRD and SEM. The most easily reducible catalysts (as determined by TPR) were the most active ones. In the low temperature region (150 °C), the most active catalyst was the V/TiO2 which presented stable activity in the production of acetaldehyde up to TOS = 200 h. On the contrary, in the high temperature region (250 °C), the most active catalyst was the V/Al2O3catalyst. The most promising result was obtained over V/TiO2 catalyst that afforded a total ethanol conversion of 60.4%wt. and a selectivity to acetaldehyde of 76.2%wt. at TOS = 164 h and T = 150 °C. Also, hydrotalcite was tested for the first time for this type of reaction providing a conversion lower than 7%wt. with a selectivity of 100%wt. to acetaldehyde at T = 150-225 °C.
Hidalgo,Ti?ler,Kubi?ka,Raabova,Bulanek
p. 178 - 189
(2016/05/19)

INTEGRATED PROCESS FOR PRODUCING CYCLIC ACETALS AND OXYMETHYLENE POLYMERS
A process for producing cyclic acetals is described. A formaldehyde source is contacted with an aprotic compound in the presence of a catalyst to produce the cyclic acetals. The aprotic compound can increase conversion rates and/or efficiency. In one embodiment, the formaldehyde source is obtained from methanol. In particular, methanol can be converted into formaldehyde which is then converted into a cyclic acetal. In one embodiment, the cyclic acetal can then be used to produce oxymethylene polymers.
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Page/Page column 32-33

(2013/06/06)

PROCESS FOR THE PRODUCTION OF TRIOXANE
The present invention relates to a process for producing cyclic acetal comprising i) preparing a liquid reaction mixture comprising a) formaldehyde source, b) an aprotic compound and c) a catalyst; and ii) converting the formaldehyde source into cyclic acetals.
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Page/Page column 28

(2013/06/06)

PROCESS FOR PRODUCING A CYCLIC ACETAL
The present invention relates to a process for producing cyclic acetal comprising i) preparing a reaction mixture comprising a) a formaldehyde source in a liquid medium and b) a catalyst; ii) converting the formaldehyde source into cyclic acetals, wherein the final conversion of said formaldehyde source to said cyclic acetal is greater than 10% on basis of the initial formaldehyde source.
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Page/Page column 29

(2013/06/06)

PROCESS FOR PRODUCING A CYCLIC ACETAL IN A HETEROGENEOUS REACTION SYSTEM
A process for producing a cyclic acetal is disclosed. According to the process, a formaldehyde source is combined with an aprotic compound and contacted with a heterogeneous catalyst which causes the formaldehyde source to convert into a cyclic acetal such as trioxane. The catalyst, for instance, may comprise a solid catalyst such as an ion exchange resin. In one embodiment, the process is used for converting anhydrous formaldehyde gas to trioxane. The anhydrous formaldehyde gas may be produced form an aqueous formaldehyde solution by an extractive distillation.
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Paragraph 00119-00120

(2013/06/06)

PROCESS FOR THE PRODUCTION OF TRIOXANE FROM AQUEOUS FORMALDEHYDE SOURCES
The present invention relates to a process for producing cyclic acetal comprising i) preparing a liquid reaction mixture comprising a) a formaldehyde source, b) an aprotic compound and c) a catalyst; wherein the total amount of protic compounds is less than 40 wt.-%, based on the total weight of the reaction mixture; and ii) converting the formaldehyde source into cyclic acetals.
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Page/Page column 34

(2013/06/06)

METHOD FOR PREPARING 1,3,5-TRIOXANE
The present invention relates to a method for preparing 1,3,5-trioxane using a reaction distillation tower including a reactor and integrally formed distillation and extraction sections. Particularly, the present invention relates to a method for preparing 1,3,5-trioxane characterized in that the amount of formaldehyde discharged to the outside of the system is reduced, to thereby increase the yield of 1,3,5-trioxane by recirculating a portion of the water phase, which is discharged through the top of the reaction extraction tower, to the extraction section, and thus to the upper portion of the extractor supply stream which supplies extractant to the extraction section.
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Paragraph 0016; 0034; 0039

(2013/09/12)

METHOD FOR PREPARING 1,3,5-TRIOXANE
The present invention relates to a method for preparing 1,3,5-trioxane using a distillation tower including a reactor, a distillation section, and an extraction section. Particularly, the present invention relates to a method for preparing 1,3,5-trioxane, in which the water phase separated from the stream discharged through the extraction unit of the reaction distillation tower is used in the process of extracting 1,3,5-trioxane.
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Paragraph 0017; 0029-0036

(2013/09/12)

METHOD FOR PREPARING 1,3,5-TRIOXANE
The present invention relates to a method for preparing 1,3,5-trioxane using a reaction distillation tower including a reactor and integrally formed distillation and extraction sections. Particularly, the present invention relates to a method for preparing 1,3,5-trioxane characterized in that the amount of formaldehyde discharged to the outside of the system is reduced, to thereby increase the yield of 1,3,5-trioxane by recirculating a portion of the water phase, which is discharged through the top of the reaction extraction tower, to the extraction section, and thus to the upper portion of the extractor supply stream which supplies extractant to the extraction section.
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Paragraph 0045-0052

(2013/10/08)

Thermal and photochemical oxidation of 2-acetylcyclopentanone with atmospheric oxygen
The major products of thermal (acetone, CaCl2 excess, reflux) and photochemical (acetone or CCl4, room temperature) oxidation of 2-acetylcyclopentanone with atmospheric oxygen are 2-acetyl-2- hydroxycyclopentanone, 2-acetyl-2-hydroxy
Novikov,Shestak
p. 1099 - 1110
(2013/07/26)

PERFLOURINATED POLY(OXYMETHYLENE) COMPOUNDS
Compounds of Formula (I): R1-O-(CF2-O)n-R1, wherein: n is an integer from 2 to 100; and R1 is perfluorinated alkyl or substituted perfluorinated alkyl are described. Also described are methods of preparing the compounds of Formula (I). For example, compounds of Formula (I) can be prepared by providing a poly(oxymethylene) compound and fluohnating the poly(oxymethylene) compound, for instance, via direct aerosol fluorination.
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Page/Page column 20-21

(2010/07/10)

INTEGRATED METHOD FOR THE PREPARATION OF TRIOXANE FROM FORMALDEHYDE
An integrated process for preparing trioxane from formaldehyde, comprising the steps of: a) feeding a feed stream A1 comprising formaldehyde and water and a recycle stream B3 comprising predominantly water and additionally formaldehyde and trioxane to a formaldehyde concentration unit and separating it into a formaldehyde-rich stream A2 and a stream A3 consisting essentially of water;b) feeding a product stream C1 comprising trioxane, water and formaldehyde, a recycle stream E1 comprising trioxane, water and formaldehyde, and, if appropriate, the stream A2 to a first low-pressure distillation column and distilling at a pressure of from 0.1 to 1.5 bar, and withdrawing a trioxane-enriched stream B comprising predominantly trioxane and additionally water and formaldehyde, a bottom draw stream B2 consisting essentially of formaldehyde and water, and the recycle stream B3 comprising predominantly water and additionally formaldehyde and trioxane as a side draw stream;c) feeding the bottom draw stream B2 and, if appropriate, the stream A2 to a trioxane synthesis reactor and allowing them to react to obtain the stream C1 comprising trioxane, water and formaldehyde;d) feeding the stream B1 to a medium-pressure distillation column and distilling at a pressure of from 1.0 to 3.0 bar to obtain a low boiler stream D1 comprising methanol, methylal and methyl formate, and a stream D2 comprising predominantly trioxane and additionally formaldehyde and water;e) feeding the stream D2 to a high-pressure distillation column and distilling at a pressure of from 2.5 to 10.0 bar to obtain the recycle stream E1 comprising trioxane, water and formaldehyde, and a product stream E2 consisting essentially of trioxane; the stream A2 being fed either to the low-pressure distillation column or to the trioxane synthesis reactor or to both.
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Page/Page column 3

(2009/07/25)

Process For Synthesizing Trioxymethylene Using Ionic Liquid
The present invention relates to a process for synthesizing trioxymethylene, wherein an aqueous solution of formaldehyde is used as the reactant; and an acidic ionic liquid in an amount of from 0.01 to 10 wt % is used as a catalyst.
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Page/Page column 4

(2009/01/20)

Integrated Method For the Production of Trioxane From Formaldehyde
The invention relates to an integrated process for preparing trioxane from formaldehyde in which, in a first step, a stream A1 comprising water and formaldehyde and a recycle stream B2 consisting substantially of water and formaldehyde are fed to a trioxane synthesis reactor in which the formaldehyde is converted to trioxane to obtain a product stream A2 comprising trioxane, water and formaldehyde. Stream A2 and a recycle stream D1 comprising trioxane, water and formaldehyde are fed to a first distillation column and distilled at a pressure in the range from 0.1 to 2.5 bar to obtain a stream B1 enriched in trioxane, and the stream B2 consisting substantially of water and formaldehyde. Stream B1 is fed to a second distillation column and distilled at a pressure in the range from 0.2 to 17.5 bar to obtain a product stream C2 consisting substantially of trioxane, and a stream C1 comprising trioxane, water and formaldehyde. Stream C1 is fed to a third distillation column and distilled at a pressure in the range from 1 to 10 bar to obtain the recycle stream D1 comprising trioxane, water and formaldehyde, and a stream D2 consisting substantially of water.
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Page/Page column 3-4

(2008/12/08)

Method for separating trioxane from a mixture containing trioxane, formaldehyde and water
A process for removing trioxane from a mixture I of formaldehyde, trioxane and water, by a) distilling the mixture I in a first distillation stage at a pressure of from 0.1 to 2 bar to obtain a stream II which comprises formaldehyde and a stream III which comprises predominantly trioxane and additionally water and formaldehyde, b) mixing the stream III with a recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde to obtain a stream IIIa which comprises predominantly trioxane and additionally water and formaldehyde, c) distilling the stream IIIa, if appropriate after removing low boilers from the stream III or IIIa in a further distillation stage, in a second distillation stage at a pressure of from 0.2 to 10 bar, the pressure in the second distillation stage being at least 0.1 bar higher than the pressure in the first distillation stage, to obtain a stream IV of trioxane and a stream V which comprises predominantly trioxane and additionally water and formaldehyde, d) distilling the stream V in a third distillation stage at a pressure of from 0.1 to 4 bar to obtain a stream VI which comprises predominantly water and additionally formaldehyde, and the recycle stream VII which comprises predominantly trioxane and additionally water and formaldehyde, e) if appropriate, distilling the stream VI in a fourth distillation stage to obtain a stream VIII which comprises predominantly water, and a stream IX which comprises predominantly formaldehyde.
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Page/Page column 3-5

(2008/06/13)

METHOD OF SYNTHESIZING TRIOXYMETHYLENE FROM FORMALDEHYDE BY THE CATALYTIC ACTION OF AN IONIC LIQUID
The present invention relates to a method of synthesizing trioxymethylene from formaldehyde by the catalytic action of an acidic ionic liquid. In the method, formaldehyde solution with a concentration of 30?80 wt % is used as reactant, and an ionic liquid is used as catalyst. The cation moiety of the catalyst is selected from either imidazoles cation or pyridines cation, and the anion moiety of the catalyst is selected from one of p-tolyl benzene sulfonate, trifluoromethyl sulfonate, and hydrogen sulfate. In the present invention, ionic liquid is used, for the first time, as a catalyst to synthesize trioxymethylene from formaldehyde. The catalyst can be circularly used for continuous sampling.
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Page/Page column 1; 2-3

(2008/06/13)

TWO-STAGE METHOD FOR THE PRODUCTION OF TRIOXANE FROM A HIGHLY CONCENTRATED AQUEOUS FORMALDEHYDE SOLUTION, THE REACTION MIXTURE BEING STRIPPED FROM THE SYNTHESIS REACTOR IN A GASEOUS FORM AND BEING TRANSFERRED INTO A DISTILLATION COLUMN
The invention relates to a method for producing raw trioxane, comprising the following stages: - a highly concentrated aqueous formaldehyde solution is subjected to an acid catalyzed reaction so as to obtain a trioxane/formaldehyde/water mixture (stage I); and - the trioxane/formaldehyde/water mixture obtained in stage I is distilled in order to obtain raw trioxane (stage II). The inventive method is characterized in that the trioxane/formaldehyde/water mixture is stripped from the synthesis reactor (R) in a gaseous form in stage I.
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Page/Page column 2; 6

(2008/06/13)

TRIOXANE PRODUCTION METHOD WHEREIN A SIDE AQUEOUS FLOW IS DEDUCTED AT A FIRST DISTILLATION STAGE
The invention relates to a trioxane production method comprising the following stages: catalysed reaction in an acid medium of an aqueous highly concentrated formaldehyde solution (1) in a reactor (R) for obtaining a trioxane/formaldehyde/water mixture (2) (stage I); distillation of said trioxane/formaldehyde/water mixture (2) of the stage I for obtaining a raw trioxane as a head flow (3) (stage II), distillation treatment of the raw dioxane of the stage II in one or several stages for obtaining a pure dioxane (8), wherein a side aqueous flow (4) is deducted during the stage II.
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Page/Page column 4-7

(2008/06/13)

METHOD FOR THE PRODUCTION OF TRIOXANE
The invention relates to a method for producing trioxane from aqueous formaldehyde solutions in the presence of acid catalysts. The formaldehyde is reacted into trioxane in a reaction column comprising a circulating evaporator. The formaldehyde solution used as an initial solution is mixed with a lateral flow from the bottom of the reaction column and is fed to the top portion of the reaction column via a tubular reactor. The inventive method is characterized by the fact that it requires little energy and forms a small amount of secondary product.
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Page/Page column 5-7

(2008/06/13)

Synthesis of trioxane using heteropolyacids as catalyst
A high formaldehyde feed concentration and a low reaction temperature are among the advantages of using heteropolyacids (phosphotungstic acid and silicotungstic acid) as catalysts in the formation of trioxane; this cyclic trimer of formaldehyde (see scheme) is used in the industrial production of acetal resins. Compared to reactions with a conventional catalyst, like sulfuric acid, trioxane can be produced in higher yield and with higher selectivity.
Masamoto, Junzo,Hamanaka, Katsuhiko,Yoshida, Kohichi,Nagahara, Hajime,Kagawa, Kenji,Iwaisako, Toshiyuki,Komaki, Hajime
p. 2102 - 2104
(2007/10/03)

Preparation of 1,3,5-trioxane by homogeneous catalysis with heteropoly acids
Formation of trioxane and Cannizzaro reaction at 96.5°C in the presence of heteropoly acids as catalysts in aqueous solutions containing 54-56 wt % of formaldehyde were studied.
Balashov,Danov
p. 1014 - 1016
(2007/10/03)

Hydrolysis of Di- and Trimesylhydroxylamines and their Methylated Derivatives
The mesylhydroxylamines (CH3SO2)2NOH, (CH3SO2)2NOCH3, CH3SO2N(H)OSO2CH3, CH3SO2N(CH3)OSO2CH3 (1-4) and (CH3SO2)2NOSO2CH3 (5) were treated with basic, neutral, and acidic aqueous solutions.The reaction products were identified.Possible decomposition mechanisms were discussed.
Brink, Klaus,Mattes, Rainer
p. 351 - 354
(2007/10/02)

Zeolite catalyst and alkylation process
An improved alkylation catalyst is provided exemplified by a type X or Y zeolite with cesium, rubidium or potassium cations, and with a boron or phosphorous component added. The catalyst is useful in producing styrene from toluene and methanol.
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(2008/06/13)