Method for separating acetone and methanol mixture

A mixture and methanol technology, applied in the field of extraction and distillation, can solve the problems of small quantity and inability to implement recycling production, etc., and achieve the effect of simple equipment, concise process and convenient operation

Inactive Publication Date: 2011-09-21
YANGZHOU LIBANG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetone and methanol waste liquids produced by various factories cannot have the ideal content. Often the mass fractio

Method used

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Experimental program
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Embodiment Construction

[0008] 1. Equipment

[0009] Still kettle, extractive distillation column, condensate reflux, brine storage tank and extractant pump.

[0010] The theoretical plate number of the extractive distillation column is 45, and the 15th plate is used as the feeding plate. Connect the extractant pump to the dosing plate.

[0011] 2. Production case

[0012] Add the mixture of acetone and methanol into the distillation kettle for heating, connect the extraction agent pump and the feeding plate with a flow rate of 120-180kg / h sodium chloride or potassium chloride aqueous solution.

[0013] When the top reflux ratio of the extractive distillation tower is 3-4:1, the distillate at the top temperature of 56-56.5°C is collected, which is acetone, and the mass fraction of acetone is 99.7%.

[0014] Continue to heat the still, and collect the distillate whose top temperature exceeds 56.5°C, that is, methanol, and the mass fraction of methanol can reach more than 99%.

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Abstract

The invention discloses a method for separating an acetone and methanol mixture, relating to the technical field of extraction and distillation. In the invention, a fifteen plate in an extractive rectifying tower with the theoretical tower number of 45 is used as a feeding plate, and a water solution of sodium chloride or potassium chloride is introduced by the connection of the feeding plate; when the reflow ratio of the tower top of the extractive rectifying tower is 4:1, a distillate with the temperature of 56-56.5DEG C, which is collected at the tower top, is acetone; a distillation tower is continuously heated; and a distillate with the temperature of over 56.5DEG C, which is collected at the tower top, is methanol. The method disclosed by the invention can be realized just by distillation-extraction and can be operated at normal temperature and normal pressure; an extracting agent is free from recovery; the method adopts simple equipment and a simple process, has favorable separation effect and is convenient to operate; the respectively-obtained acetone has the mass fraction being capable of reaching 99.5 percent, does not contain the methanol and only contains water with less than 5 percent; and the mass fraction of the obtained methanol can also reach 99.5 percent.

Description

technical field [0001] The invention relates to the technical field of extractive distillation. Background technique [0002] The mixture of methanol and acetone cannot be separated by ordinary distillation because it forms an azeotrope, and can only be separated by extractive distillation. There are domestic research results. However, the simulation software HYSYS2.2 is based on the mass fraction of acetone being 88% and the mass fraction of methanol being 12%. The feeding plate on which the extractant and materials are placed, is subjected to extraction and rectification to separate acetone and methanol. On this basis, CN101492345A proposes a patented technology for separating acetone and methanol by adding salt, extracting and rectifying. However, the acetone and methanol waste liquids produced by various factories cannot have the ideal content, and the mass fraction of methanol is often greater than 20%, and the quantity is not large, so it is impossible to implement ...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C31/04C07C45/83C07C49/08
Inventor 吴洪侯玉祥
Owner YANGZHOU LIBANG CHEM
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