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Method for extractive distillation with salt for separating acetone and methanol

A technology for extractive distillation and extractive distillation column, which is applied in the field of salt-added extractive distillation and separation of acetone and methanol, and can solve problems such as difficulty in separating methanol and acetone azeotrope.

Active Publication Date: 2011-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that there is a difficult separation problem in the separation process of methanol and acetone azeotrope, and a new method for separating acetone and methanol by adding salt, extracting and rectifying is provided

Method used

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  • Method for extractive distillation with salt for separating acetone and methanol
  • Method for extractive distillation with salt for separating acetone and methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The theoretical plate number of extractive distillation tower is 15 (the number of plate is counted from top to bottom), selects the ethylene glycol (20% of the massfraction of ethylene glycol) that contains lithium chloride as salting solvent, from the 3rd block The theoretical plate is added, and the flow rate is 30 g / min. The mixture of acetone and methanol is added from the 8th theoretical plate. The mass fraction of acetone is 85%, the mass fraction of methanol is 15%, and the flow rate is 10 g / min. The reflux ratio at the top of the extractive distillation tower was 0.2, and the temperature at the top of the tower was controlled at 56-56.5°C. The mass fraction of the acetone was 99.95% and the mass fraction of methanol was 0.05% when analyzing the top product. The extraction and rectification tower reactor discharges methanol, salt, and solvent mixture into the solvent recovery tower. The solvent recovery tower has 10 theoretical plates, and the feeding position is...

Embodiment 2

[0018] The theoretical plate number of extractive distillation column is 40 (the number of plate number is counted from top to bottom), selects the aqueous solution (3% of the mass fraction of sodium acetate) that contains sodium acetate for use as salting solvent, adds from the 6th theoretical plate, The flow rate is 5 g / min, the mixture of acetone and methanol is added from the 20th theoretical plate, the mass fraction of acetone is 85%, the mass fraction of methanol is 15%, and the flow rate is 10 g / min. The reflux ratio at the top of the extractive distillation tower was 4, and the temperature at the top of the tower was controlled at 56-56.5°C. The mass fraction of the acetone was 99.97% and the mass fraction of methanol was 0.03% when analyzing the top product. The extractive distillation column discharges methanol, salt, and solvent mixture into the solvent recovery tower. The solvent recovery tower has 50 theoretical plates, and the feeding position is the 30th theoreti...

Embodiment 3

[0020] The number of theoretical plates of the extractive distillation column is 25 (the number of plates is counted from top to bottom), and the aqueous solution (5% of the mass fraction of sodium acetate) that contains potassium nitrate is selected as the salting solvent, and it is added from the 5th theoretical plate, The flow rate is 15 g / min, the mixture of acetone and methanol is added from the 12th theoretical plate, the mass fraction of acetone is 85%, the mass fraction of methanol is 15%, and the flow rate is 10 g / min. The reflux ratio at the top of the extractive distillation tower was 2, and the temperature at the top of the tower was controlled at 56-56.5°C. The mass fraction of the acetone was 99.94% and the mass fraction of methanol was 0.06% by analyzing the top product. The extractive distillation column discharges methanol, salt, and solvent mixture into the solvent recovery tower. The solvent recovery tower has 30 theoretical plates, and the feed position is t...

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Abstract

The invention relates to a method for separating acetone from methanol by extractive rectification with salt. The method mainly solves the technical problem in the prior art that the separation is difficult during the process of separating an acetone-methanol azeotrope. The invention solves the problem well by the technical proposal which comprises the steps as follows: solvent containing salt and the acetone-methanol azeotrope are respectively put into the upper part and the middle part of an extractive distillation column for the extractive rectification with salt; pure acetone is extractedfrom the top of the column; and a mixture of the methanol, the salt and the solvent is obtained at the bottom of the column; the mixture of the methanol, the salt and the solvent is put into a solvent recovery tower; distillate at the top of the tower is pure acetic acid; and the solvent containing the salt is obtained at the bottom of the tower. The invention can be used in the industrial application for recycling the acetone and the methanol.

Description

technical field [0001] The invention relates to a method for separating acetone and methanol by adding salt, extracting and rectifying. Background technique [0002] With the increase of demand for liquid fuels based on petroleum and the reduction of available reserves of petroleum resources, the method of producing usable liquid fuels from solid fuels such as coal has attracted more and more attention. There are two different technical routes for the liquefaction of solid fuels, one is direct liquefaction and the other is indirect liquefaction. Direct liquefaction is a process of directly converting solid fuels such as coal into liquefied oil under the action of solvents and catalysts under high temperature and pressure. The operating conditions of direct liquefaction are harsh and highly dependent on raw materials. Indirect liquefaction, commonly referred to as Fischer-Tropsch synthesis, is the synthesis gas containing carbon monoxide and hydrogen produced by solid fuels...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/84C07C31/04C07C45/83C07C49/08
Inventor 钟禄平肖剑钟思青顾军民
Owner CHINA PETROLEUM & CHEM CORP