Method for separating azeotropic system of benzene and isobutanol by pressure swing distillation

Abstract

The invention relates to a method for separating azeotrope of benzene and isobutanol by pressure swing distillation and a device suitable for the method. The device mainly comprises an atmospheric tower LP, a pressurization tower HP, condensers C1 and C2, reflux tanks D1 and D2 and reboilers R1 and R2, wherein the reboilers R1 and R2 are connected to bottoms of the atmospheric tower LP and the pressurization tower HP respectively, the condenser C1 and the reflux tank D1 are connected to the top of the atmospheric tower LP sequentially, and the condenser C2 and the reflux tank D2 are connectedto the top of the pressurization tower HP sequentially. According to the method for separating the azeotropic system of benzene and isobutanol by pressure swing distillation, two tower sequences are included, that is, sequence one: separating the lowest azeotrope in the atmospheric tower, and then separating the highest azeotrope in the pressurization tower; sequence two: separating the highest azeotrope in the pressurization tower, and then separating the lowest azeotrope in the atmospheric tower. The problem about separation caused by the fact that the azeotropic behavior of the system showsthe lowest and highest characteristics with the increase of pressure is solved, and the method has the advantages of low energy consumption and high product recovery rate.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method for separating the azeotropic system of benzene and isobutanol by pressure swing rectification, and is especially suitable for separating the azeotropic behavior as the pressure increases, that is, at low pressure (low pressure) The binary azeotrope system of benzene and isobutanol is the lowest azeotrope in the range of 5 atm, and the highest azeotrope in the range of high pressure (greater than 7 atm). Background technique [0002] Isobutanol is a colorless, flammable, organic compound with a special smell, often used as a solvent in chemical reactions. Isobutanol is used as a reactant to synthesize isobutyl acetate for the production of paints and similar coatings, and isobutyl esters can be synthesized as plasticizers for rubber, plastics, etc. Isobutanol can also be used as a solvent for paints, inks, etc. and as a cle...

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Problems solved by technology

[0010] In view of the characteristics of the current traditional pressure swing rectification process and the problem that the benzene and isobutanol system exhibits different azeotropic behaviors with pressure changes, the scientific problems to be solved by the patent of the present invention are as follows:

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