Low-impurity fatty acid amide propyl tertiary amine production process and device

Abstract

The invention relates to a low-impurity fatty acid amide propyl tertiary amine production process and device capable of reducing cost and shortening the production cycle. Gas dimethylaminopropylamineand liquid fatty acid are subjected to a gas-liquid two-phase reaction and sequentially pass through a heater and an atomizer to become mist; dimethylaminopropylamine is used for uniformly distributing gas in the rectifying tower through the porous distributor, methylaminopropylamine gas penetrates through the rectifying tower from bottom to top and is in rapid contact with atomized fatty acid, the gas-liquid two-phase continuous countercurrent contact strengthens the mass transfer process, and the amidation reaction is greatly promoted. According to the invention, the materials in the rectifying tower depend on the special structures of the units and the fluid motion, so that the fluids are respectively dispersed and mutually mixed, a good mixing effect is achieved, the production periodis obviously shortened, and the production of PKO products with low fatty acid content is facilitated; the problem of dimethylaminopropylamine wastewater discharge is avoided, clean production of fatty acid amide propyl tertiary amine is truly realized, the production period is shortened, the production cost is reduced, and the like.

Description

technical field [0001] The invention belongs to the field of surfactants, and relates to the production of fatty amidopropyl tertiary amine, in particular to a production process and device for low-impurity fatty amidopropyl tertiary amine with reduced cost and shortened production cycle. Background technique [0002] Fatty amidopropyl tertiary amine (hereinafter referred to as PKO) is an important intermediate in the production of cationic, zwitterionic surfactants and some other fine chemicals. The traditional production process of PKO is as follows: after the fatty acid and dimethylaminopropylamine are reacted at a temperature of 140-180°C, the excess dimethylaminopropylamine is removed by vacuum to obtain the product PKO. The traditional PKO reaction device is a tank reactor, and the reaction mode is mostly limited to liquid-liquid reaction, the amidation reaction effect is poor, and the main reasons for the high fatty acid content: (1) At a reaction temperature of 140-1...

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Problems solved by technology

[0003] The purpose of the present invention is in order to overcome the deficiency of above-mentioned background technology, a kind of production technique and the device of the fatty amidopropyl tertiary amine of low impurity are provided; content ≤ 0.2%), and there is no dimethylaminopropylamine wastewater discharge problem, which truly realizes the clean production of fatty amidopropyl tertiary amine, shortens the production cycle, and reduces production costs.

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