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A heat-integrated extraction and rectification energy-saving process for separating tetrahydrofuran-methanol

An extractive distillation and tetrahydrofuran technology, which is applied in the field of energy-saving technology for thermally integrated extractive distillation and separation of tetrahydrofuran-methanol, can solve the problems of high separation energy consumption, difficult separation of tetrahydrofuran-methanol mixture, complicated process, etc. The effect of convenience and low investment in equipment

Active Publication Date: 2020-05-15
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an energy-saving process for heat-integrated extraction and rectification separation of tetrahydrofuran-methanol, which solves the problem of difficult separation of tetrahydrofuran-methanol mixture due to azeotropy. Compared with other methods, the process saves equipment investment costs and has high separation purity of products , no environmental pollution, and realize heat integration to reduce energy consumption
[0011] The present invention provides an energy-saving process for separating tetrahydrofuran-methanol by heat-integrated extraction and rectification, aiming at the present situation of high energy consumption and complicated process for the separation of binary azeotropic mixture in the process of extractive distillation

Method used

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  • A heat-integrated extraction and rectification energy-saving process for separating tetrahydrofuran-methanol
  • A heat-integrated extraction and rectification energy-saving process for separating tetrahydrofuran-methanol
  • A heat-integrated extraction and rectification energy-saving process for separating tetrahydrofuran-methanol

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Effect test

Embodiment 1

[0032] Attached figure 1 Shown process flow sheet, feed flow rate is 2000kg / h, and feed temperature is 35 ℃, and feed composition is tetrahydrofuran 50% (mass fraction), methyl alcohol 50% (mass fraction); Extractant feed flow rate is 3000kg / h, the supplementary feed flow rate of the extractant is 0.4kg / h, and the feed temperature of the extractant is 55°C. The theoretical plate number of the extractive distillation column is 45, the pressure is 0.3atm (absolute pressure), the feed is from the 20th plate, the feeding position of the extractant is the 3rd plate, and the extraction position of the measuring line is the 40th plate , the reflux ratio is 1.8; the number of theoretical plates of the solvent recovery tower is 12, and the pressure is 1 atm (absolute pressure), fed by the 7th plate, and the position of the measuring line extraction entering the intermediate reboiler is the 4th plate, reflux The ratio is 2.0. After separation, the product concentration of THF is 99.9...

Embodiment 2

[0036] Attached figure 1Shown process flow sheet, feed flow rate is 3000kg / h, and feed temperature is 35 ℃, and feed composition is tetrahydrofuran 50% (mass fraction), methyl alcohol 50% (mass fraction); Extractant feed flow rate is 4000kg / h, the supplementary feed flow rate of the extractant is 0.45kg / h, and the feed temperature of the extractant is 55°C. The theoretical plate number of the extractive distillation column is 50, the pressure is 0.3atm (absolute pressure), the feed is from the 25th plate, the feeding position of the extractant is the 5th plate, and the extraction position of the measuring line is the 42nd plate , the reflux ratio is 1.9; the number of theoretical plates of the solvent recovery tower is 14, and the pressure is 1 atm (absolute pressure). The feed is fed from the 9th plate, and the position of the measuring line to enter the intermediate reboiler is the 6th plate, and the reflux The ratio is 2.4. After separation, the product concentration of ...

Embodiment 3

[0041] Attached figure 1 Shown process flow sheet, feed flow is 2000kg / h, and feed temperature is 35 ℃, and feed is composed of tetrahydrofuran 40% (mass fraction), methyl alcohol 60% (mass fraction); Extractant feed flow is 2800kg / h, the supplementary feed flow rate of the extractant is 0.28kg / h, and the feed temperature of the extractant is 55°C. The theoretical plate number of the extractive distillation column is 48, the pressure is 0.1atm (absolute pressure), the feed is from the 22nd plate, the extraction agent feeding position is the 4th plate, and the extraction position of the measuring line is the 41st plate , the reflux ratio is 2.2; the number of theoretical plates of the solvent recovery tower is 15, and the pressure is 1atm (absolute pressure). The feed is fed from the 10th plate, and the measuring line is extracted into the middle reboiler. The position is the 7th plate, and the reflux The ratio is 2.3. After separation, the product concentration of THF is 99...

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Abstract

The invention relates to an energy-saving process of separating tetrahydrofuran-methanol by thermal integrated extractive distillation and belongs to the technical field of chemical separation. According to the process, dimethyl sulfoxide is selected as an extraction agent, tetrahydrofuran and methanol are separated by extractive distillation by means of side-draw and intermediate reboiler process flows, and the side-draw material of an extractive distillation tower enters a solvent recovery tower and a tower bottom hot material flow of the solvent recovery tower is recovered as a heat source to integrate heat of the intermediate reboiler and the reboiler of the extractive distillation tower, so that the energy consumption is reduced to a great extent. The product mass fractions are 99.9% or above. The process provided by the invention has the advantages of being energy-saving and environment-friendly, high in separated product purity, cost-saving and the like.

Description

【Technical field】 [0001] The invention belongs to the field of rectification and purification in the chemical industry, and in particular relates to an energy-saving process for separating tetrahydrofuran-methanol through extraction and rectification with heat integration. 【Background technique】 [0002] Tetrahydrofuran is an important raw material for organic synthesis and a solvent with excellent performance. The main use is to produce polytetrahydrofuran, especially suitable for dissolving PVC, polyvinylidene chloride and butylaniline. It is widely used as surface coatings, anti-corrosion coatings, and printing inks. , tape and film coating solvent, and used as a reaction solvent, when used in electroplating aluminum liquid, the thickness and brightness of the aluminum layer can be controlled arbitrarily. As one of the basic organic raw materials, methanol is mainly used in the manufacture of various organic products such as formaldehyde, acetic acid, methyl chloride, met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/08C07C31/04C07C29/84B01D3/00B01D3/32
CPCB01D3/007B01D3/322C07C29/84C07D307/08C07C31/04Y02P20/10Y02P20/50Y02P70/10
Inventor 王英龙马康白文婷李国选朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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