Catalytic cracking method for preparing N-(3-dimethylamino propyl) methacrylamide

Abstract

The invention discloses a catalytic cracking method for preparing N-(3-dimethylaminopropyl) methacrylamide, which comprises the steps that: an intermediate raw material of N-dimethylin-Beta-dipropylamino acrylamide and a catalyst of calcium nitrate are mixed and put into a reaction kettle, with the mixture ratio of the raw material to the catalyst to be 25:1 to 50:1; with the mixture ratio of the raw material to the catalyst to be 1000:0.5 to 1000:1, materials of certain quantity are sent to a high-post dripping tank by a storage-tank pump and dripped into a catalytic cracking reaction vessel at a stable speed when the pressure is reduced to the vacuum degree of 10mmHg and the temperature is raised to 220 DEG C, so that the concentration of the catalyst in the reaction vessel is kept basically stable in the reaction course; a hot water circulating pump is started to keep the returning temperature of the circulating hot water equal to or lower than 105 DEG C; a heat conducting oil heating system is started so that the temperature of the material in the reaction vessel increases to 220 DEG C; gaseous reacting materials are sent from the reaction vessel to a partial condenser; the cooled materials are sent out from the top of the partial condenser and enter into next process. With the same equipment parameters, the catalytic cracking method of the invention improves the production capacity of equipment and product yield rate and reduces energy consumption.

Description

technical field [0001] The invention relates to a preparation method of N-(3-dimethylaminopropyl)methacrylamide. Background technique [0002] N-(3-Dimethylaminopropyl)methacrylamide (DMAPMA) is a very important fine chemical intermediate and monomer. The polymer synthesized with it as the main intermediate belongs to the fourth generation flocculant and The third generation of oil extraction additives, which are widely used in coatings, resins, electroplating, printing and dyeing, water treatment flocculants, membrane technology, medicine, cosmetics and other industries. The global development and application of this product began in the 1960s. However, by the end of the last century, the application of this product was still not very extensive. After entering the 21st century, foreign countries have developed a large number of fine chemicals with very good quality using this product The new products include cosmetics, shampoo products, high-grade coatings, ionic membranes...

AI Technical Summary

Problems solved by technology

Therefore, the whole system is in the process of periodic changes, which affects the improvement of the reaction rate and reduces the utilization rate of public works

[0018] The heat transfer temperature difference of the catalytic cracking reactor is too high, which increases the residue and affects the yield of the product

[0019] The segregation system after catalytic cracking is unstable, and the separation efficiency is low, which brings a large load to the subsequent system

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