93-01-6Relevant articles and documents
Method of combined production of high-purity Schaffer's salt and G salt
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Paragraph 0028-0042, (2018/05/07)
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.
Process for aryl-quinone and aryl-naphthoquinone diazide sulfonic acids
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, (2008/06/13)
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.
Excited-State Proton-Transfer Kinetics: A Theoretical Model
Arnaut, Luis G.,Formosinho, Sebastiao J.
, p. 685 - 691 (2007/10/02)
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.
