Device and method for preparing fatty alcohol by carboxylate hydrolysis

By adopting the main partition and secondary partition design of the partition reactive distillation tower in the carboxylic acid ester hydrolysis process, and combining the reaction and separation processes, the problems of low conversion rate and difficult separation in the existing technology are solved, and efficient fat production is achieved. Alcohol production reduces energy consumption and equipment investment.

CN103360216AActive Publication Date: 2013-10-23WANHUA CHEM GRP CO LTD +1
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Patent Information

Application Number
CN201310332652.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2013-08-01
Publication Date
2013-10-23
Estimated Expiration
2033-08-01

AI Technical Summary

Technical Problem

In the existing technology, the carboxylic acid ester hydrolysis process has problems such as low reaction conversion rate, complicated separation process and high energy consumption. Especially in the production process of lower fatty alcohols, the diversification of azeotrope system increases the difficulty of separation.

Method used

Using a partition reactive distillation tower, through the design of the main partition and the sub-partition, the reaction process, product separation and unreacted material circulation are combined in the same tower, and the distillation effect of the main partition and the sub-partition is used to achieve carboxylation. Efficient separation of acid ester hydrolyzate to improve conversion rate and purity.

Benefits of technology

It achieves a conversion rate of more than 95% of carboxylate esters and a purity of 99.5% of fatty alcohols, reduces equipment investment and energy consumption, avoids back-mixing, and improves thermodynamic efficiency and conversion rate.

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Abstract

The invention discloses a device and a method for preparing fatty alcohol by carboxylate hydrolysis. The method adopts a division-wall reaction distillation tower; a bottom space of the division-wall reaction distillation tower is a common stripping section (1); a top space of the division-wall reaction distillation tower is a common rectifying section (8); a main division plate (11) and a secondary division plate (13) are arranged in the division-wall reaction distillation tower; the main division plate (11) deviates from a tower center longitudinal cross-section and is parallel to the tower center longitudinal cross-section; the secondary division plate (13) and the main division plate (11) are located at different sides of the tower center longitudinal cross-section; the secondary division plate (13) is higher than the main division plate (11) and is parallel to the main division plate (11); the secondary division plate (13) does not contact with the tower top; and two sides of the secondary division plate (13) are provided with a secondary feeding side rectifying section (7) and a secondary collection side rectifying section (14). The device and the method improve tower separation efficiency, can produce fatty alcohol or a fatty alcohol-water azeotrope having the purity of 99.5%, can realize the maximum carboxylate conversion ratio of above 95% and can reduce energy consumption.
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