Continuous preparation process of dimethyl succinylo succinate

Abstract

The invention provides a continuous preparation process of dimethyl succinylo succinate. According to the continuous preparation process of dimethyl succinylo succinate, a dimethyl succinate meteringcontinuous feeding module, a sodium methoxide metering continuous feeding module, a condensation module, an acidification module, a strong acid metering continuous feeding module, a PH on-line monitoring module, a control system, a plate frame module, a filtrate layering module, a first rectification module, a refluxing channel, a refining module, a methanol metering continuous feeding module, a filtering module, a second rectification module, a waste water recovering module and a drying module. By the continuous preparation process of the dimethyl succinylo succinate, acidification is continued under on-line monitoring by the PH on-line monitoring module, manual sampling detection and intermittent acidification in the past are replaced, the production capacity of equipment is improved andthe labor intensity is reduced; meanwhile, the acidification temperature is easy to control, the hydrolysis condition of the dimethyl succinate caused by high temperature is avoided, consumption of the raw materials is reduced, the input proportion of the dimethyl succinate is reduced and the utilization rate is increased.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a continuous preparation process of dimethyl succinylsuccinate. Background technique [0002] With the rapid formation and development of industrialization and marketization of industries such as automobiles, real estate, and advertisements, the society pays more and more attention to the durability of automobiles, real estate, and advertisements. As a high-grade, high-value-added pigment intermediate, dimethyl succinylsuccinate is an important intermediate for the preparation of quinacridone-based high-grade organic pigments, 1,4-cyclohexanedione and photosensitive polymers. The competition in the production market is becoming increasingly fierce, which requires not only to ensure the quality of dimethyl succinate, but also to expand production and reduce its production costs in order to remain invincible in the fierce competition. [0003] In the existing condensation process ...

AI Technical Summary

Problems solved by technology

And this batch type reaction technology, more difficult to realize the accurate control of sodium methoxide drop rate and reaction temperature, and acidification temperature height, raw material hydrolysis ratio height, consumption of reaction raw material dimethyl succinate is large, production cost is high, and product yield is low , the quality of the product is unstable, and at the same time, workers need to take samples frequently during intermittent production, the labor intensity is high, the working environment is harsh, and there are safety risks, which is not conducive to the improvement of the market competitiveness of dimethyl succinate

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