System and technology for preparing N, N-diethyl acrylamide

Abstract

The invention discloses a system and a technology for preparing N, N-diethyl acrylamide. Diethylamine and methyl acrylate which are used as raw materials are subjected to a Michael addition reaction,an amidation reaction and a thermal cracking reaction to obtain theN, N-diethyl acrylamide, and a star mixer is used for reaction in the Michael addition reaction process. According to the technologydisclosed by the invention, a catalyst solvent used in the Michael addition reaction in N, N-diethyl acrylamide synthesis can be avoided, and the reaction temperature is relatively low.

Description

technical field [0001] The invention relates to a system and process for preparing N,N-diethylacrylamide. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] N,N-dialkyl substituted acrylamide is a kind of acrylamide derivatives, which can be used as a monomer to produce high polymers, and can also be used as an intermediate for the synthesis of fine chemicals such as pesticides. It is an important raw material for the modern material industry . Its molecule contains both a hydrophilic amide group and a hydrophobic hydrocarbon skeleton. The coexistence of amphiphilic groups makes the hydrolytic stability of N,N-dialkyl substituted acrylamide copolymers significantly improve...

AI Technical Summary

Problems solved by technology

The acryloyl chloride method is based on acryloyl chloride and diethylamine as raw materials, with alkaline substances (sodium hydroxide, sodium carbonate, etc.) The reaction temperature is low and the rate is fast, which effectively avoids the occurrence of the polymerization reaction. However, according to the inventors, acryloyl chloride is expensive and the source is difficult. It is mainly used in laboratory research at present, and there is no report on industrial application.

[0006] According to inventor's understanding, the main process of acrylate method is Michael addition reaction, amidation reaction, pyrolysis reaction and vacuum distillation etc., in Michael addition reaction process, have research to add catalyst (such as sodium methylate) to react , at the same time, it is necessary to add a solvent, which will increase the burden on the subsequent separation and purification, and the catalyst needs to be added in the process, which is easy to generate solid waste, and the temperature needs to be controlled at 35-60 °C

Some studies have directly used a high temperature of 75°C in the Michael addition reaction process to avoid the addition of catalysts, but the inventors found that when the high temperature of 75°C is used for addition, there is a risk of polymerization of methyl acrylate, and a polymerization inhibitor needs to be added , while the normal pressure boiling point of diethylamine is 55°C, and the normal pressure boiling point of methyl acrylate is 80°C. At 75°C, both raw materials are volatilized, especially diethylamine, so there must be a reflux device in the process , increases equipment investment, and makes the process cumbersome, and also requires heat energy consumption

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