Method for continuously producing m-aminoacetanilide hydrochloride

A technology of m-aminoacetanilide hydrochloride and aminoacetanilide hydrochloride, which is applied in the field of synthesis of dye intermediates, can solve the problems of high energy consumption for heating and cooling, low production efficiency, etc., achieve continuous production process and improve production Efficiency, the effect of reducing the amount of refrigerant used

Active Publication Date: 2018-06-12
ZHEJIANG DIBANG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low production efficiency and high energy consumption for heating and cooling in the existing intermittent production process of m-aminoacetanilide hydrochloride, the present invention provides a continuous production method of m-aminoacetanilide hydrochloride

Method used

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  • Method for continuously producing m-aminoacetanilide hydrochloride

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Experimental program
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Effect test

Embodiment 1

[0030] (1) m-phenylenediamine and mother liquor water are pumped into the mixer by a metering pump at a flow rate of 300kg / hour and 1500kg / hour respectively to obtain mixture A. The temperature of mixture A is 70-73°C. The temperature of the mixture A is raised to 85-88°C, and the temperature of the mixture A is raised to 108-112°C through the reboiler. The mixture A enters the first-stage reactor, and continuously pumps acetic acid into the first-stage reactor. 175kg / hour, continuously feed hydrogen chloride gas into the first-stage reactor, the flow rate is 110kg / hour, the reaction temperature of the first-stage reactor is controlled at 135-138°C, the reaction material overflows to the second-stage reactor, and the first-stage reactor The reaction temperature of the second-stage reactor is controlled at 140-143° C. to generate a mixture B containing m-aminoacetanilide hydrochloride.

[0031] (2) The mixture B exchanges heat with the mixture A through the heat exchanger, and ...

Embodiment 2

[0037] (1) m-phenylenediamine and mother liquor water are pumped into the mixer by a metering pump at a flow rate of 300kg / hour and 1500kg / hour respectively to obtain mixture A. The temperature of mixture A is 70-73°C. The temperature of the mixture A is raised to 85-88°C, and the temperature of the mixture A is raised to 108-112°C through the reboiler. The material of the mixture A enters the first-stage reactor, and continuously pumps acetic acid into the first-stage reactor at a flow rate of 160kg / hour, continuously feed hydrogen chloride gas into the first-stage reactor, the flow rate is 100kg / hour, the reaction temperature of the first-stage reactor is controlled at 132-134°C, and the reaction material overflows to the second-stage reactor; The 2nd stage reactor is pumped into acetic acid, and the flow rate is 20kg / hour, and continuously feeds hydrogen chloride gas into the 2nd stage reactor, and the flow rate is 10kg / hour, and the reaction temperature of the 2nd stage rea...

Embodiment 3

[0044] (1) m-phenylenediamine and mother liquor water are pumped into the mixer by a metering pump at a flow rate of 300kg / hour and 1500kg / hour respectively to obtain mixture A. The temperature of mixture A is 70-73°C. The temperature of the mixture A is raised to 85-88°C, and the temperature of the mixture A is raised to 108-112°C through the reboiler. The material of the mixture A enters the first-stage reactor, and continuously pumps acetic acid into the first-stage reactor at a flow rate of 165kg / hour, continuously feed hydrogen chloride gas into the first-stage reactor, the flow rate is 110kg / hour, the reaction temperature of the first-stage reactor is controlled at 133-135°C, and the reaction material overflows to the second-stage reactor; Acetic acid is pumped into the second-stage reactor, and the flow rate is 10kg / hour. Hydrogen chloride gas is continuously fed into the second-stage reactor, and the flow rate is 5kg / hour. Mixture B of m-aminoacetanilide hydrochloride....

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Abstract

The invention discloses a method for continuously producing m-aminoacetanilide hydrochloride. The method includes (1), pumping m-phenylenediamine and mother liquor into a mixer by the aid of meteringpumps according to a mass ratio of 1:4-10, mixing the m-phenylenediamine and the mother liquor with each other to obtain mixtures A, heating the mixtures A by heat exchangers and reboilers, then feeding the mixtures A into a reactor, continuously adding acetic acid and hydrogen chloride gas into the reactor and generating mixtures B with m-aminoacetanilide hydrochloride finished products; (2), cooling the mixtures B by heat exchangers and coolers, separating the mixtures B to obtain the m-aminoacetanilide hydrochloride finished products and mother liquor and collecting and reusing the mother liquor. The method has the advantages that the m-aminoacetanilide hydrochloride can be continuously produced by the aid of the method, the production efficiency and the product quality can be improved,and the labor cost and the production cost can be reduced; heat exchange can be carried out on reaction materials by the aid of heat of finished product materials, accordingly, reaction waste heat can be effectively utilized, the usage of coolants for cooling and crystallizing the finished product materials can be decreased, and m-aminoacetanilide hydrochloride production energy consumption can be reduced.

Description

technical field [0001] The invention relates to the field of synthesis of dye intermediates, relates to a continuous automatic chemical production technology, in particular to a continuous production method of m-aminoacetanilide hydrochloride. Background technique [0002] M-aminoacetanilide hydrochloride is a widely used chemical raw material, widely used in disperse dyes, reactive dyes and pharmaceutical intermediates, mainly used to prepare reactive yellow K-RN and disperse dye intermediates, such as N,N-di Disperse dye intermediates such as ethyl-m-acetamidoaniline and N,N-diacetoxyethyl-m-acetamidoaniline are in great demand. [0003] In the synthesis process of m-aminoacetanilide hydrochloride, the general production process adopts m-phenylenediamine, acetic acid, hydrochloric acid and the previous cycle of mother liquor water after concentration, and the temperature is raised to react. After the reaction is completed, the temperature is cooled to about 30°C, and pump ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C231/02C07C231/24C07C233/43
CPCC07C231/02C07C231/24C07C233/43
Inventor 唐智勇徐万福赵小敏冯彦博
Owner ZHEJIANG DIBANG CHEM
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