- A methane disulfonic acid sub-methyl ester preparation method (by machine translation)
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The invention discloses a methane disulfonic acid sub-methyl ester preparation method, the preparation method comprises the sulfonation reaction and dehydration condensation reaction, the sulfonation reaction is methane sulfonic acid with the sulfonating agent with the sulfonation reaction to obtain the methylene sulfonic acid; the dehydration condensation reaction is the sulfonation reaction for preparation of methylene sulfonic acid with formaldehyde compound dissolved in an organic solvent, in the presence of a dehydrating agent, carries out dehydration condensation reaction to generate methane disulfonic acid sub-methyl ester crude product, the resulting methane disulfonic acid sub-methyl ester crude product added to the water washing, drying shall get the methane disulfonic acid sub-methyl ester works. The invention relates to a methane disulfonic acid sub-methyl ester preparation method abandons the traditional to methylene sulfonic acid sodium as raw materials, by precipitation, acidification, dehydration to obtain intermediate methylene sulfonic acid. The sulfonation methane sulfonic acid directly obtained after the methylene sulfonic acid, the present invention production process is simple, and atom utilization rate high, three wastes, high yield. (by machine translation)
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Paragraph 0028-0035
(2018/12/12)
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- Method for preparing methanedisulfonic acid
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Disclosed is a method for preparing methanedisulfonic acid, comprising an acidification, wherein the acidification comprises that methanedisulfonate reacts with an acidifier to form a mixture containing methanedisulfonic acid. The disclosure has high yield, low cost, and the process are environmental friendly.
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Page/Page column 0034
(2016/01/10)
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- 3,5-Dimethylpyrazole promoted sulfonation of acetic anhydride by H 2SO4 to sulfoacetic acid and methanedisulfonic acid, and crystal structures of the complexes with Co2+, Zn2+, Ba2+, Pb2+ and Cs+
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Sulfuric acid can sulfonate acetic anhydride (but not acetic acid) to sulfoacetic acid, and also to methanedisulfonic acid in the presence of 3,5-dimethylpyrazole. Under the experimental conditions employed, sulfonation of 3,5-dimethylpyrazole with concentrated sulfuric acid in acetic anhydride/acetic acid as solvent leads to a mixture of approximately 47 mol% 3,5-dimethylpyrazole-4-sulfonic acid, 34 mol% sulfoacetic acid and 19 mol% methanedisulfonic acid, as determined by 1H NMR spectroscopy. The Co2+, Zn2+, Ba2+ and Pb2+ complexes of the sulfoacetate ligand, as well as the Cs+ complex of the methanedisulfonate ligand were isolated upon crystallization of the compounds obtained from the reaction of the above ligand mixture with the corresponding metal oxide or carbonate in water. Single-crystal X-ray crystallography of Co(O3SCH2CO2)(H2O)3, Zn(O3SCH2CO2)(H2O)3, Ba(O3SCH2CO2)(H2O), Pb(O 3SCH2CO2)(H2O) and Cs 2(O3SCH2SO3) reveals a variety of new coordination modes of the two sulfonated ligands within those structures.
- Jianrattanasawat, Sarut,Mezei, Gellert
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experimental part
p. 318 - 323
(2012/05/20)
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- Process for oxidation of methane to acetic acid
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Acetic acid or derivatives such as methyl acetate and acetyl sulfate, are produced from methane by contacting a methane-containing feed with an oxygen-containing gas in the presence of a palladium-containing catalyst and an acid selected from concentrated sulfuric acid and fuming sulfuric acid. The process is carried out using an oxygen partial pressure of from about 30 to about 300 psi and most preferably from about 60 to about 200 psi, a methane partial pressure of from about 100 to about 1000 psi, and most preferably from about 100 to about 400 psi, and a total pressure of oxygen and methane of from about 130 to about 1300 psi, preferably from about 200 to about 600 psi. The process is carried out in the absence of a catalyst promoter.
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Page/Page column 3-5; sheet 1-3
(2008/06/13)
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- Low pressure process for the preparation of methanedisulfonic acid alkali metal salts
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The invention provides a process for producing alkylpolysulfonic acid alkali metal salts such as methanedisulfonic acid alkali metal salts. The process involves heating an aqueous solution of about two molar equivalents of an alkali metal sulfite to a temperature of from about 70° C. to about 90° C.; adding about one molar equivalent of a dihaloalkane to the aqueous alkali metal sulfite solution at a temperature of about 70-90° C.; and then separating the resulting alkyldisulfonic acid alkali metal salt from the reaction solution. The dihaloalkane is added at a pressure of about 1.1 atmospheres or less.
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Page/Page column 2; 3
(2008/06/13)
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- TRANSFORMATIONS OF ANTHRAISOXAZOL-6-ONES IN HYDROHALIC ACIDS
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4-Halo-1-aminoanthraquinones are formed when anthraisoxazol-6-ones are refluxed in hydrohalic acids.The 3 position undergoes halogenation when 5-substituted isoxazoles are used.The process takes place via a one-proton mechanism with the participation of halide ion in the rate-determining step, possibly with the intermediate formation of N-haloaminoanthraquinones.
- Gornostaev, L. M.,Sakilidi, V. T.
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p. 1112 - 1114
(2007/10/02)
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- TRANSFORMATIONS OF 1-AZIDOANTHRAQUINONES IN HYDROHALIC ACIDS
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When heated in hydrohalic acids, 1-azidoanthraquinones are converted into 1-amino-4-halogenoanthraquinones.Under these conditions the 4-substituted azides are converted into the corresponding 2-halogeno-1-aminoanthraquinones.The kinetic data indicate the intermediate formation of N-halogenoaminoanthraquinones.
- Gornostaev, L. M.,Sakilidi, V. T.
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p. 562 - 565
(2007/10/02)
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