- Method of combined production of high-purity Schaffer's salt and G salt
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A method of combined production of high-purity Schaffer's salt and G salt comprises the following steps: 1) performing a reaction with 2-naphthol as a raw material and sulfuric acid as a sulfonating agent at 20-90 DEG C for 1-10 h to prepare a sulfonated solution; 2) adding water to the sulfonated solution for hydrolysis at 70-150 DEG C for 1-2 h to obtain a hydrolyzed solution; 3) adding ammoniato the hydrolyzed solution, maintaining temperature at 70-130 DEG C for 1-5 h to perform salting-out; 4) cooling the mixture to 40-50 DEG C and filtering the mixture, water-washing and drying a filtercake to obtain a Schaffer's salt product, mixing the filtrate and washing waste water, adding ammonia or ammonium sulfate and maintaining temperature at 70-130 DEG C for 1-5 h to perform salting-out,and cooling the mixture to 40-50 DEG C and filtering and separating the mixture, and drying a filter cake to obtain a G salt product. The method can achieve combined production of the Schaffer's saltand G salt at high purity; meanwhile, total utilization rate of raw materials and equipment utilization rate are increased. The method has simple processes, is environment-friendly and is economical.
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Paragraph 0028-0042
(2018/05/07)
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- Triphendioxazine dyestuffs
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The novel triphendioxazine dyestuffs of the formula STR1 in which the substituents R, R', T1, T2, X, Y and n have the meanings given in the description are highly suitable for the dyeing and printing of cellulose-containing or amido-containing material.
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- Process for aryl-quinone and aryl-naphthoquinone diazide sulfonic acids
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A process for the preparation of aryl-diazide-sulfonic acids by a series of sequential in-situ process steps. The process comprises the nitrosation of a hydroxyarylsulfonic acid; conversion of the nitroso-derivative to a sulfamate which is then diazotized to the diazide. Temperature and pH are maintained in predetermined ranges to maintain the reaction products in solution without the formation side-products or the need to isolate intermediates. The process of the invention is particularly useful in the preparation of light-sensitive materials such as naphthoquinonediazide sulfonic acids which are used in the preparation of photoresist compositions. The invention provides a high purity product at a high material efficiency, high equipment utilization, low effluent discharge, and reduced cost.
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- Excited-State Proton-Transfer Kinetics: A Theoretical Model
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The intersecting-state model is applied to excited state proton-transfer reactions.The results are consistent with those previously obtained for the analogous ground-state reactions.The transition-state bond order n* is similar in the ground and excited states: carbon acids have lower n* than nitrogen or oxygen acids.The mixing entropy parameter λ is found to be lower for excited-state than ground-state reactions.The mechanistic implications of this are discussed.
- Arnaut, Luis G.,Formosinho, Sebastiao J.
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p. 685 - 691
(2007/10/02)
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- Dynamics of Excited-State Reactions in Reversed Micelles. 2. Proton Transfer Involving Various Fluorescent Probes according to Their Sites of Solubilization
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Reversed micelles of bis(2-ethylhexyl)sulfosuccinate (AOT) in heptane were investigated with three acid fluorescent probes: 2-naphtol (NOH), sodium 2-naphtol-6-sulfonate (NSOH), and potassium 2-naphtol-6,8-disulfonate (NDSOH).These probes, which tend to undergo protolysis in the excited state, are well suited to the investigation of the acid-base reacitvity of water molecules forming the aqueous core.The rate constants for deprotonation and back-recombination were determined by phase fluorometry as a function of the water content w=/.These rate constants together with the spectroscopic properties of the probes provide information on their localization and the corresponding ability of the microenvironment to accept a proton. (i) NDSOH is localized around the center of the water pool and, at water contents, w, greater than about 10, its behavior regarding protolysis is identical with that in bulk water. (ii) NSOH resides in the vicinity of the interface and an amount of water of w 40 is required for observing the same deprotonation rate as in bulk water whereas the rate of back-recombination is still much faster. (iii) NOH is localized at the interface and does not undergo deprotonation in the excited state whatever the water content.Efficiency and kinetics of proton transfer are thus strongly dependent on localization.The ability of water to accept a proton is related to is H-bonded structure and its protolytic reactivity is an image of its structure which changes as a function of the distance with respect to the interface.
- Bardez, Elisabeth,Monnier, Eric,Valeur, Bernard
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p. 5031 - 5036
(2007/10/02)
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- Process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid
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A process for the preparation of 1-amino-2-ethoxy-naphthalene-6-sulphonic acid from 2-hydroxy-naphthalene-6-sulphonic acid which comprises: A. contacting 2-hydroxy-naphthalene-6-sulphonic acid with at least an equimolar amount of an alkali metal nitrite in aqueous solution or suspension in the presence of hydrochloric acid, solution or suspension having a pH in the range of 2 to 5 and being at a temperature of 0° to 20° C.; B. reducing the reaction product of step A in an aqueous suspension by contacting the same with excess iron in the presence of at least an equivalent amount of iron-II ions, relative to the reaction product obtained according to step A, in the presence of a mineral acid at a temperature from 50° to 120° C., and treating the thus-obtained reaction mixture with aqueous alkali metal hydroxide in the presence of iron oxide; C. contacting the product of step B with excess acetic anhydride in an aqueous solution or suspension at a pH in the range of 3 to 10 at a temperature from 0° to 100° C.; D. contacting the product of step C with an ethylating agent in the presence of an acid binding agent in an aqueous-organic solvent or diluent in a pH range from 8 to 14 at a temperature from 20° to 150° C.; and E. deacetylating the product of step D by contacting the same at reflux with an aqueous alkali metal hydroxide.
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- Barium laked phenylazonaphthalene dye containing sulfonic acid groups
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Azo dyes containing sulfonic acid groups laked with barium and derived from an anilinesulfonic acid as diazo component and a β-naphtholsulfonic acid as coupling component for example a dye of the formula STR1 The dyes are eminently suitable as pigments for coloring surface coating compositions, printing inks and particlarly resins.
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- Metallized phenyl-azo-naphthol compounds
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Metallized azo dyes of the formula STR1 wherein A is a sulfonyl, sulfonamido or carboxamido group, D is the residue of a phenol or naphthol, E is the residue of acetoacetanilide, a phenyl or naphthyl pyrazolone or the residue of a naphthol and M is a cation. The dyes are suitable for dyeing natural and synthetic polyamides, demonstrating good all-around fastness properties.
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