Method for producing alkyl alcohol amine

Abstract

The invention provides a method for producing alkyl alcohol amine. The method is characterized by comprising the following steps of: under an alkylation reaction condition, repeatedly contacting alkylene oxide with alkylamine in a reactor; and repeatedly reacting alkylene oxide with alkylamine. On one hand, the side reaction of the alkylene oxide is reduced, and the yield proportion adjusting ranges of alkyl mono-alkylol amine and alkyl di-alkylol amine are expanded; meanwhile, raw materials are not required to be mixed in advance, and the safety of production is improved; moreover, alkylene oxide enters segmentally in a multipoint way, so that reaction heat is segmentally released, and a reaction is more stable; and furthermore, the content of the mono-alkyl alkylol amine can be controlled, so that the mono-alkyl alkylol amine is not required to be taken as a circulating liquid, and the yield of the reaction is increased.

Description

technical field [0001] The present invention relates to a process for the production of alkanolamines. Background technique [0002] In the prior art, the domestic and international production of alkanolamine generally adopts a batch production process, wherein the synthesis reaction is carried out continuously, while the distillation is a batch process. This limits the improvement of production capacity, frequently changes operating parameters, cannot produce continuously and stably, the unit consumption and energy consumption are high, the stability of product quality is difficult to guarantee, and the operation intensity of workers is high. [0003] In the prior art, the synthesis reaction is generally carried out in the form of alkylamine aqueous solution, which reduces the capacity of the reactor and increases a series of side reactions caused by water, and rectification must have a dehydration step, and some by-products are difficult to Separation from the desired pro...

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Problems solved by technology

This limits the improvement of production capacity, frequently changes operating parameters, cannot produce continuously and stably, the unit consumption and energy consumption are high, the stability of product quality is difficult to guarantee, and the labor intensity of workers is high.

[0003] In the prior art, the synthesis reaction is generally carried out in the form of alkylamine aqueous solution, which reduces the capacity of the reactor and increases a series of side reactions caused by water, and rectification must have a dehydration step, and some by-products are difficult to Separation from required products reduces product quality and increases unit consumption

In the production of some products, such as methyldiethanolamine, the existing production technology often uses methylmonoethanolamine as the circulating liquid, which not only reduces the capacity of the reactor, but also repeatedly distills and separates, greatly increasing energy consumption

In addition, in the existing production technology, the raw materials are mixed and then enter the reactor for reaction, which greatly increases the risk of the system and poses safety hazards

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