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Solvent for separating carboxylic acid mixtures by extraction and rectification

A technology for extractive rectification and separation of carboxylic acid is applied in the field of solvent separation of carboxylic acid mixture to achieve the effects of reducing production cost, reducing energy consumption and improving relative volatility

Inactive Publication Date: 2013-09-04
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that it is difficult to separate carboxylic acid mixtures with a relative volatility close to 1 by rectification, the present invention provides a solvent that can be used for extraction and rectification to separate carboxylic acid mixtures, which can increase the relative volatility between the mixtures and improve the separation efficiency. efficiency, lower energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] (1) Preparation of triethylammonium acetate

[0020] Add 0.5 mol of triethylamine into a four-necked flask equipped with a stirrer, condenser, thermometer and constant pressure dropping funnel, heat to 70°C, and drop 0.5 mol of glacial acetic acid into the flask through the constant pressure dropping funnel, Mechanical stirring and constant temperature reflux reaction. After the reaction, the liquid obtained from the reaction was distilled under reduced pressure, then anhydrous ether was added for extraction and washing, and the remaining ether was removed by vacuum distillation again, and vacuum-dried overnight at 60°C to obtain triethylammonium acetate.

[0021] (2) Investigate the extraction performance of ionic liquids

[0022] Add ionic liquid triethylammonium acetate as solvent in the mixed solution of 50% formic acid and 50% water in mass fraction, the mass ratio of solvent and mixture is 1:4, measure vapor-liquid equilibrium data, calculate its The relative vo...

example 2

[0024] (1) Preparation of tributylammonium formate

[0025] Add 0.5 mol of tributylamine into a four-neck flask equipped with a stirrer, condenser, thermometer, and constant pressure dropping funnel, heat it to 30°C, and drop 0.5 mol of formic acid into the flask through the constant pressure dropping funnel, mechanically The reaction was stirred and refluxed at constant temperature. After the reaction, distill the liquid obtained from the reaction under reduced pressure, then add n-pentane for extraction and washing, conduct reduced-pressure distillation again to remove the remaining n-pentane, and dry under vacuum at 60°C overnight to obtain tributylammonium formic acid Salt.

[0026] (2) Investigate the extraction performance of ionic liquids

[0027] According to the method of example 1 (2) step, tributylammonium formate is added to the mixed species that massfraction is 20% propionic acid and 80% butyl propionate, measures vapor-liquid equilibrium data, calculates its r...

example 3

[0029] According to the method of example 1 (2) step, tributylammonium formate is added to the mixed species that massfraction is 30% butyric acid and 70% butyl butyrate, measures vapor-liquid equilibrium data, calculates its relative volatility, from The 1.06 without solvent increased to 1.82.

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PUM

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Abstract

The invention discloses a solvent for separating carboxylic acid mixtures by extraction and rectification. The solvent is mainly composed of ionic liquid. The solvent can be absolute ionic liquid and also can be a mixture of ionic liquid and preparation materials of cations and anions thereof. The cations of ionic liquid are organic amine. The anions are carboxyl groups. The solvent for extracting, rectifying and separating carboxylic acid mixtures can raise the relative volatilities among components, can raise the separation efficiency, and can reduce the production cost.

Description

technical field [0001] The invention relates to a solvent for separating carboxylic acid mixtures, specifically, a solvent for extracting and rectifying separating carboxylic acid-water and carboxylic acid-carboxylate, carboxylic acid-alcohol, carboxylic acid-ketone, and carboxylic acid-aldehyde mixtures solvent. . Background technique [0002] During the production and use of carboxylic acids, a large number of carboxylic acid-containing mixtures will be produced. Although they will not form azeotropes, their relative volatility is close to 1, and separation is difficult. Common distillation and azeotropic distillation are often used. method of distillation. Ordinary rectification process is simple and easy to control, but requires a large number of trays and high energy consumption. Azeotropic distillation requires a small number of trays, but the amount of entrainer used is large, the configuration is complicated, and the operation control is more complicated . [000...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C51/44C07C69/14C07C69/06C07C53/08C07C53/02
CPCY02P20/54
Inventor 李青松辛华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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