Method for separating acetone and methanol mixture

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 ...

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 fraction of methanol is greater than 20%, and the quantity is not large, so it is impossible to implement large-scale recycling production