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Separation and purification process and system of 1, 4-butanediol

A technology for separation and purification of butanediol, applied in the separation/purification of hydroxyl compounds, organic chemistry, production of bulk chemicals, etc., can solve the problem of low purity of 1,4-butanediol, and achieve simple equipment and separation efficiency High, high product purity effect

Active Publication Date: 2022-08-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a 1,4-butanediol separation and purification process and system to solve the problem of low purity in the existing 1,4-butanediol production process

Method used

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  • Separation and purification process and system of 1, 4-butanediol

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Embodiment 1

[0043] The embodiment of the present invention provides a separation and purification process of 1,4-butanediol, and the process includes:

[0044] S101: Crude 1,4-butanediol is separated in a weight-removing column. Among them, the content of 1,4-butanediol is 80.1wt%, the content of 2-(4-hydroxybutoxy)tetrahydrofuran is 0.6wt%, the content of light components is 17.1wt%, and the content of other heavy components is 2.2 wt%. Light components such as γ-butyrolactone and unreacted dimethyl succinate are extracted from the top of the weight removal tower; 1,4-butanediol and 2-(4-hydroxybutoxy)tetrahydrofuran are extracted from the side line The mixture a; the bottom of the column produced 2-(4-hydroxybutoxy) tetrahydrofuran and other heavy components. The packing height of the weight-removing tower is 50 theoretical trays, the operating pressure is 10kPa, the reflux ratio is 8, the temperature at the top of the tower is 180°C, and the temperature at the bottom of the tower is ...

Embodiment 2

[0051] The embodiment of the present invention provides a separation and purification process of 1,4-butanediol, and the process includes:

[0052] S201: Crude 1,4-butanediol is separated in a weight removal tower. Among them, the content of 1,4-butanediol is 80.1wt%, the content of 2-(4-hydroxybutoxy)tetrahydrofuran is 0.6wt%, the content of light components is 17.1wt%, and the content of other heavy components is 2.2 wt%. Light components such as γ-butyrolactone and unreacted dimethyl succinate are extracted from the top of the weight removal tower; 1,4-butanediol and 2-(4-hydroxybutoxy)tetrahydrofuran are extracted from the side line The mixture a; the bottom of the column produced 2-(4-hydroxybutoxy) tetrahydrofuran and other heavy components. The packing height of the weight-removing tower is 10 theoretical trays, the operating pressure is 5kPa, the reflux ratio is 5, the temperature at the top of the tower is 160°C, and the temperature at the bottom of the tower is 180...

Embodiment 3

[0059] The embodiment of the present invention provides a separation and purification process of 1,4-butanediol, and the process includes:

[0060] S301: Crude 1,4-butanediol is separated in a weight removal tower. Among them, the content of 1,4-butanediol is 80.1wt%, the content of 2-(4-hydroxybutoxy)tetrahydrofuran is 0.6wt%, the content of light components is 17.1wt%, and the content of other heavy components is 2.2 wt%. Light components such as γ-butyrolactone and unreacted dimethyl succinate are extracted from the top of the weight removal tower; 1,4-butanediol and 2-(4-hydroxybutoxy)tetrahydrofuran are extracted from the side line The mixture a; the bottom of the column produced 2-(4-hydroxybutoxy) tetrahydrofuran and other heavy components. The packing height of the weight-removing tower is 50 theoretical trays, the operating pressure is 25kPa, the reflux ratio is 10, the temperature at the top of the tower is 200°C, and the temperature at the bottom of the tower is 2...

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Abstract

The invention provides a separation and purification process and system of 1, 4-butanediol, an extraction agent in the process is a composite extraction agent, and through compounding of various compounds and synergistic effect of components, the compounded solvent has proper viscosity, selectivity and higher boiling point, so that the composite extraction agent and the 1, 4-butanediol are separated and purified, and the separation and purification process of the 1, 4-butanediol is realized. Phase separation occurs in the process of contacting the 1, 4-butanediol solution and the 2-(4-hydroxybutoxy) tetrahydrofuran, so that selective separation of the 1, 4-butanediol and the 2-(4-hydroxybutoxy) tetrahydrofuran is realized. And the separated 1, 4-butanediol and 2-(4-hydroxybutoxy) tetrahydrofuran are subjected to a rectification process, such that the 1, 4-butanediol with a concentration of 99.99 wt% or more can be obtained. In addition, the proportion of the two products can be flexibly adjusted according to needs, the recovery rate of the 1, 4-butanediol is remarkably improved, the loss rate of the 1, 4-butanediol is reduced to the maximum extent, and economic benefits are improved. The system provided by the invention has the advantages of simple equipment, low investment, high separation efficiency and high product purity.

Description

technical field [0001] The invention relates to the technical field of 1,4-butanediol production, in particular to a separation and purification process and system of 1,4-butanediol. Background technique [0002] 1,4-Butanediol is an important basic organic chemical raw material used in the production of tetrahydrofuran, polydibutyl terephthalate, γ-butyrolactone and polyurethane. In recent years, with the rapid development of degradable materials, PBS (full English name: poly(butylene succinate); Chinese full name: polybutylene succinate), PBAT (English full name: polybutylene succinate) and 1,4-butanediol as raw materials Full name: Poly(butyleneadipate-co-terephthalate); Chinese full name: polyadipate / butylene terephthalate) and other degradable materials are increasing in production capacity, making the upstream raw material 1,4-butanediol demand The production volume has also grown rapidly, and all major 1,4-butanediol producers in the world have expanded their product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C29/86C07C29/76C07C31/20
CPCC07C29/80C07C29/86C07C29/76C07C31/207Y02P20/54
Inventor 薄德臣周明东王景芸王贺李蕾陈阳孙京
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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