Calcium-based catalyst, and method used for catalytic synthesis of alkanolamide surfactant with calcium-based catalyst

Abstract

The invention discloses a calcium-based catalyst, and a method used for catalytic synthesis of an alkanolamide surfactant with the calcium-based catalyst, and belongs to the technical field of surfactant synthesis. The composite calcium-based catalyst is used for catalyzing reaction of grease or fatty ester with alkyl alcohol amine to synthesize the alkanolamide surfactant light in color and low in free alkyl alcohol amine content, and it is beneficial for applications in daily chemical products. The calcium-based catalyst possesses slow release characteristic, is capable of maintaining relatively catalytic reaction activity at reaction late period, and ensuring high efficiency conversion of alkyl alcohol amine into the alkanolamide surfactant; alkyl alcohol amine conversion rate is high;alkyl alcohol amine residual amount in obtained product is low; nitrosamine risk of the product caused by alkyl alcohol amine residue is reduced greatly; reaction early period rate is reduced greatlythrough catalyst slow release control, so that poor heat transfer in synthesis process and product color darkening caused by too fast reaction rate at the early stage are avoided effectively.

Description

technical field [0001] The invention relates to a calcium-based catalyst and a method for catalyzing and synthesizing alkanolamide surfactants, belonging to the technical field of surfactant synthesis. Background technique [0002] Alkanolamides are nonionic surfactants with excellent properties such as thickening, foam stabilization and emulsification. Rust additives are used for cleaning and anticorrosion of metal surfaces and as lubricants for machining processes, etc. [0003] According to the raw material sources of long-chain acyl donors, the methods for synthesizing alkanolamide surfactants mainly include fatty acid method, fatty acid lower alcohol ester method and oil method. In 1937, Wolf Kritchevsky first developed the reaction of fatty acid and diethanolamine to synthesize alkanolamide, but the quality of the product was relatively poor, and its active substance content was only 60%. Invented basic catalysts such as slightly excess fatty acid and alkali metal al...

AI Technical Summary

Problems solved by technology

For 1:1 alkanolamide products, although the process of feeding catalyst or adding catalyst intermittently in multiple batches can maintain a high amidation reaction activity in the later stage of the reaction, thereby greatly reducing the residue of alkanolamine in the product However, the residual amount of alkanolamine in the product obtained by this process is still relatively high, and the new problems of increased difficulty in process control and cumbersome process operation

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