Preparation method for alkyl alcohol amine

A technology of alkanolamine and alkylamine, which is applied in the field of preparation of alkanolamine, can solve problems such as increasing the difficulty of water separation, reducing the utilization rate of alkylene oxide, and hydrolysis loss of alkylene oxide, and achieving the conversion rate of raw materials and Effects of high recovery, high reactivity and selectivity, and shortened process flow
CN105085282AActive Publication Date: 2015-11-25NANJING BAOCHUN CHEMICAL INDUSTRY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING BAOCHUN CHEMICAL INDUSTRY CO LTD
Publication Date
2015-11-25

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Abstract

The invention discloses a preparation method for alkyl alcohol amine. The preparation method comprises the following steps: (1) feeding alkyl amine and a reaction promoter alkanolamine into a reaction kettle for stirring and mixing; (2) adding epoxy alkane for synthesis, wherein the feeding molar ratio of epoxy alkane for synthesis to alkyl amine is higher than the theoretical reaction molar ratio; (3) after the feeding is finished, carrying out heating and pressurization; (4) carrying out heat preservation conversion rate to obtain a crude product; (5) conducting continuous distillation on the crude product to separate out alkyl alcohol amine. During the preparation, alkanolamine is primary alkanolamine or secondary alkanolamine. Compared with the prior art, the preparation method provided by the invention adopts the technical scheme that alkanolamine is taken as the reaction promoter instead of water as a catalyst, so that the conversion rate of alkyl amine can reach 99.0% in general, the highest conversion rate can reach 99.9%, and the highest recovery rate of alkyl alcohol amine can reach 99.8%. Therefore, the preparation method provided by the invention has the advantages of being high in raw material conversion rate and recovery rate.
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Description

technical field

[0001] The invention relates to a preparation method of alkanolamine. Background technique

[0002] Most of the existing alkanolamine production technologies adopt batch reaction or continuous production. The common feature of these processes is that most of them use water as a synthesis reaction catalyst, and in order to suppress the formation of polyether by-products, an excessive amount of Alkylamine, adopt 2.5~50% water as catalyzer in the patent CN103261130A, the feed molar ratio of ethylene oxide and dialkylamine is 1: 1.1~10, because the oxyethane and dialkylamine Reaction molar ratio is 1: 1, and in this document, the consumption of alkylamine is excessive, and the feed molar ratio of alkylene oxide and alkylamine is 0.10~0.91 times of its theoretical reaction molar ratio, and as in the patent US2337004A It is also mentioned that excessive alkylamines can significantly inhibit the generation of by-products, but due to the excess of amines, after the ...

Claims

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