Method and equipment for continuously producing dimethyl succinylo succinate

Abstract

The invention discloses a method for continuously producing dimethyl succinylo succinate. Condensation reaction and acidification reaction can be continuously carried out, and rectification devices are additionally arranged on reaction kettles, so that condensation continuity is realized, and materials are prevented from being recycled. The invention also discloses equipment for continuously producing dimethyl succinylo succinate. The equipment comprises a condensation reaction kettle, the rectification devices, a middle kettle and an acidification reaction kettle. Through a reasonable designand reasonable process parameter setting, dimethyl succinylo succinate can be continuously produced. By adopting the continuous process and equipment provided by the invention, the yield is improved by 30 percent or above compared with a batch type, the reaction yield is improved to 85 percent or above, and the total production cost is reduced by around 20 percent.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a method for continuously producing dimethyl succinylsuccinate and special equipment for implementing the method. Background technique [0002] Quinacridane pigments (Quinacridane, referred to as QA) is a high-grade pigment, which was first put on the market by DuPont in 1958. Although quinacridone pigments have small molecular weight and simple molecular structure, they have excellent heat resistance, solvent resistance and migration resistance. Its color spectrum is red, purple and orange. Because of its good light fastness, weather resistance, and thermal stability, it is widely used in high-end car topcoats, repair paints, high-end paints, inks, and engineering plastics. [0003] Dimethyl succinylsuccinate (DMSS for short) is a key intermediate for the manufacture of quinacridone series of advanced pigments. In recent years, with the rapid development of China and the gl...

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Problems solved by technology

[0009] When the prior art adopts the above method to synthesize DMSS, most of them adopt intermittent batch reaction, which not only has low yield, high production cost, but also has defects such as unstable product quality between batches.

[0010] The Chinese patent application with the application number 201710409685.9 discloses a method for continuous production of dimethyl succinate, but its technical scheme only records that the reactant is continuously added dropwise to a certain liquid level, and then the material is continuously transferred. Obtain dimethyl succinyl succinate sodium salt, then acidify in batches to obtain dimethyl succinyl succinate, the process is relatively simple, but the actual continuous production needs to carry out complicated process and equipment design, according to the The method disclosed in the application continuously produces dimethyl succinyl succinate, and the improvement effect of product yield and quality is not satisfactory

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