A method for separating sec-butyl acetate from the mixture after the reaction of acetic acid and C4

Abstract

The invention provides a method for separating unreacted C4 from a mixture obtained from reacted acetic acid and C4. The method includes the steps of putting a mixture obtained from reacted acetic acid and C4 in a light component removal column operated at atmospheric pressure, pumping out gasified unreacted C4 light components from the top of the column, putting the gasified unreacted C4 light components in a compressor to be liquefied into a liquid phase, setting part of liquefied C4 as top reflux, extracting the other part of the liquefied C4 as products, and extracting acetic acid, sec-butyl acetate and C8 hydrocarbon which drop to the bottom of the column for further separation. The method for separating unreacted C4 from the mixture obtained from reacted acetic acid and C4 is operated at atmospheric pressure, the temperature of the top and the bottom of the column is reduced, the requirements on heat source of a column bottom reboiler are reduced, the under-pressure operation is changed to atmospheric pressure operation, the C4 light components are separated completely, the liquid compressed through the compressor flows back, the temperature of the top of the column is reduced, the possibility of the acid top of the column is reduced, materials at the bottom of the column do not contain C4 components after separation, and the impact of C4 light components on the fluctuation of separation column operations after the C4 light components are accumulated in a subsequent separation column.

Description

technical field [0001] The invention relates to a method for separating unreacted C4 from a mixture of acetic acid and C4 reacted, in particular to a method for separating unreacted C4 from a mixture of acetic acid and C4 reacted by using an atmospheric distillation column. Background technique [0002] Second-butyl acetate, also known as second-butyl acetate and second-butyl acetate, is one of the four isomers of butyl acetate. It is a colorless, flammable, fruity-flavored liquid. The performance of the isomers is similar, and it has excellent solubility for a variety of synthetic resins and natural resins. Widely used in coatings, inks, adhesives, pesticides, medicines, spices, fine chemicals and oil products and other industries. The existing method for preparing sec-butyl acetate mainly uses C4 olefins as raw materials, and reacts with acetic acid to obtain sec-butyl acetate. This method has a wide source of raw materials and is cheap, good economic benefits, and enviro...

AI Technical Summary

Problems solved by technology

Since the separated C4 light component contains a small amount of acetic acid, the C4 light component needs to be deacidified before being sent out to prevent corrosion of subsequent pipelines and equipment. At the same time, because the separated tower bottom material contains A small amount of C4 light components, this part of C4 light components will be brought into the subsequent separation steps, and will accumulate in the subsequent separation tower, and will affect the operating pressure and separation efficiency of the subsequent separation tower, resulting in unnecessary material loss and separate energy consumption

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