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Technology for separating tetrahydrofuran-methanol-water through three-tower batch distillation

A technology for tetrahydrofuran and rectification separation, which is applied in distillation separation, separation method, fractionation and other directions, can solve problems such as increasing process separation load, achieve effective separation and extraction, reduce energy consumption, and ensure the effect of separation effect

Active Publication Date: 2020-08-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent (CN206188692U) relates to a device for extracting and rectifying recovery of tetrahydrofuran, which is obviously different from the present invention in terms of settings, and also needs to introduce an extractant to increase the separation load of the process

Method used

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  • Technology for separating tetrahydrofuran-methanol-water through three-tower batch distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 5500kg THF-methanol-water raw material solution with 70% THF and 15% methanol into the raw material tank V1, and part of the raw material liquid enters the rectification column HPC through the delivery pump P1 and valve F1. The number of HPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 4atm, the temperature at the top of the column is 106.6°C, and the temperature at the bottom of the column is 117.5°C. Part of the raw material in the raw material tank V1 enters the rectification column LPC through the delivery pump P2 and the valve F2. The number of LPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 0.5 atm, the temperature at the top of the tower is 43.5°C, and the temperature at the bottom of the tower is 89.6°C. The bottom of the rectification tower LPC extracts high-purity water during the water extraction stage, and enters the ...

Embodiment 2

[0046] Add 6000kg THF-methanol-water raw material solution with 71% THF and 14% methanol into the raw material tank V1, and part of the raw material liquid enters the rectification column HPC through the delivery pump P1 and valve F1. The number of HPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 9atm, the temperature at the top of the column is 138.8°C, and the temperature at the bottom of the column is 154.6°C. Part of the raw material in the raw material tank V1 enters the rectification column LPC through the delivery pump P2 and the valve F2. The number of LPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 1 atm, the temperature at the top of the column is 61.9°C, and the temperature at the bottom of the column is 102.8°C. The bottom of the rectification tower LPC extracts high-purity water during the water extraction stage, and enters the...

Embodiment 3

[0048] Add 5800kg of THF-methanol-water raw material solution with 70% THF and 16% methanol into the raw material tank V1, and part of the raw material liquid enters the rectification column HPC through the delivery pump P1 and valve F1. The number of HPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 5 atm, the temperature at the top of the column is 114.5°C, and the temperature at the bottom of the column is 126.9°C. Part of the raw material in the raw material tank V1 enters the rectification column LPC through the delivery pump P2 and the valve F2. The number of LPC plates in the rectification column is 30 plates, the feed position is the second plate, the operating pressure is 1 atm, the temperature at the top of the tower is 48.2°C, and the temperature at the bottom of the tower is 92.8°C. The bottom of the rectification tower LPC extracts high-purity water during the water extraction stage, and enters th...

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Abstract

The invention relates to a process for separating tetrahydrofuran-methanol-water through three-tower batch distillation. According to the characteristic that a tetrahydrofuran-methanol-water ternary mixture forms two binary azeotrope systems and the azeotropic composition changes under different pressures, separation of complex ternary systems in small-batch production is realized by adopting a mode that three rectifying towers are matched for operation. The mass fraction of the separated tetrahydrofuran liquid is greater than 99.9%, the mass fraction of the methanol liquid is greater than 99.9%, and the mass fraction of water is greater than 99.9%. The invention provides a novel batch distillation process, a third component does not need to be introduced, the process load is low, the costis saved, the liquid-phase component extracted from the bottom of the tower is subjected to effective component segmentation, high-purity tetrahydrofuran is separated, meanwhile, efficient recovery of methanol and water is realized, and the energy consumption is reduced.

Description

【Technical field】 [0001] The invention belongs to the field of chemical separation and purification, and in particular relates to a process for separating tetrahydrofuran-methanol-water by three-tower batch rectification. 【Background technique】 [0002] Tetrahydrofuran is a common chemical solvent with a boiling point of 66°C under normal pressure. Methanol is the simplest saturated monohydric alcohol with a boiling point of 64.7°C under normal pressure. In the process of small batch chemical production, the two often appear in the process wastewater in the form of mixture with water. There are two sets of binary minimum azeotropes in THF-methanol-water ternary system under normal pressure. The azeotropic point of the tetrahydrofuran-methanol mixture is 59.8° C., the mass fraction of tetrahydrofuran in the azeotropic composition is 70%, and the mass fraction of methanol is 30%. The azeotropic point of the tetrahydrofuran-water mixture is 63.4° C., the mass fraction of tet...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80C07C29/82C07D307/08B01D3/14
CPCC07C29/80C07C29/82C07D307/08B01D3/146C07C31/04
Inventor 李鑫王英龙朱兆友崔培哲杨晶巍孟凡庆齐建光
Owner QINGDAO UNIV OF SCI & TECH
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