4433-79-8Relevant articles and documents
A 4 - chloro - 2, 5 - dimethoxy acetoacetanilide preparation method (by machine translation)
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Paragraph 0026; 0027; 0028; 0029; 0030; 0031; 0032-0035, (2017/08/25)
The invention relates to a 4 - chloro - 2, 5 - dimethoxy acetoacetanilide preparation method, its implementation are as follows: in a reaction container adding organic solvent and 4 - chloro - 2, 5 - two-anisidine, at a temperature of 10 - 100 °C lower, instillment pair ketene, about 0.5 - 5 hours after adding, canada finishes, thermal insulation reaction 0.5 - 4 hours, the reaction is finished, cooled to 0 - 10 °C, discharging the filter press, the crystalline substance is 4 - chloro - 2, 5 - dimethoxy acetoacetanilide, the filtrate is recycled. The method of the invention the resulting product quality is good, high yield, low cost, realizes the zero discharge of waste water or micro-discharge, accord with the green production requirement of environmental protection, the operation is simple, convenient for industrialization. (by machine translation)
Preparation technology of novel naphthol AS-IRG (2,5-Dimethoxy-4-chloroacetoacetanilide)
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Paragraph 0021; 0034, (2016/11/17)
The invention relates to a preparation technology of novel naphthol AS-IRG (2,5-Dimethoxy-4-chloroacetoacetanilide). The preparation technology is characterized in that a novel separated reaction kettle is firstly designed, a three-blade sweepback axial flow stirrer is arranged in a reaction kettle body, a material inlet is formed in the upper part of the reaction kettle body, a material outlet is formed in the lower part of the reaction kettle body, and the bottom part of the reaction kettle body is provided with a water gathering pipe and a water separating valve; reactions of esterification, hydrolysis, amidation and the like are carried out in the reaction kettle. The preparation technology disclosed by the invention is novel, green and high-yield, water which is produced in a reaction process is effectively separated, amidation reaction equilibrium is promoted to continuously move rightwards, and the product yield of the naphthol AS-IRG is greatly increased through optimizing reaction conditions.
Process for improving the application properties of disazo pigments
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, (2008/06/13)
Process for improving the application properties of disazo pigments obtained by coupling bis-diazotized chlorine-substituted 4,4'-diaminobiphenyls with acetoacetylaminobenzenes, which includes adding sulfite ions to the pigment suspension obtained in the coupling and then heating for one half to two hours at 50° to 100° C. The process produces, above all in large scale industrial batches, a product of uniform quality and having acceptable fastness to solvents, overlacquering, migration and bleeding.