Method for separation of benzene and isobutanol azeotropic system by pressure swing rectification

Abstract

The invention is a method for separating benzene and isobutanol azeotrope by pressure swing rectification and a device suitable for the method. The device mainly includes: atmospheric column LP, pressurized column HP, condensers C1 and C2, reflux tanks D1 and D2, reboilers R1 and R2; wherein reboilers R1 and R2 are respectively connected to the atmospheric column LP and the The bottom of the pressure column HP, the condenser C1 and the reflux tank D1 are sequentially connected to the top of the atmospheric column LP, and the condenser C2 and the reflux tank D2 are sequentially connected to the top of the pressurization column HP. The method for separating the azeotrope system of benzene and isobutanol by pressure swing rectification has two column sequences, that is, sequence one: the lowest azeotrope is separated in the atmospheric column first, and the highest azeotrope is separated in the high pressure column, sequence two : The highest azeotrope is separated in the high pressure column first, and then the lowest azeotrope is separated in the atmospheric pressure column. The invention solves the separation problem brought about by the azeotropic behavior of the system showing the lowest and highest characteristics respectively as the pressure rises, and 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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