A method and system for recovering and preparing sec-butyl acetate in heavy hydrocarbons above C12 as a by-product of sec-butyl acetate

Abstract

The invention provides a method and system for recycling sec-butyl acetate in sec-butyl acetate preparation by-product heavy hydrocarbons having the carbon number of 12 or more; the method comprises the steps: under azeotropic rectification conditions, water and the heavy hydrocarbons having the carbon number of 12 or more enter an sec-butyl acetate recycling tower and are subjected to azeotropic rectification, an azeotrope of water and sec-butyl acetate is obtained from the tower top, a mixture of C12-C16 hydrocarbons and a part of water is obtained from the tower bottom, and the content of water entering the sec-butyl acetate recycling tower is 1.1-10 times that of sec-butyl acetate obtained from the tower top in the azeotropic form; the azeotrope of the tower top is condensed and then subjected to oil-water separation, and an aqueous phase product and an oil phase product containing sec-butyl acetate are obtained; and the bottom tower mixture of the C12-C16 hydrocarbons and the water is discharged and cooled and then subjected to oil-water separation, and an aqueous product and a C12-C16 hydrocarbon oil phase product are obtained. The method has the advantages of low requirements on a heat source, low energy consumption, and high yield, the amount of the by-product heavy hydrocarbons having the carbon number of 12 or more is reduced, the sales pressure is relieved, at the same time, the yield of sec-butyl acetate is increased, and the purposes of increasing production and efficiency are realized.

Description

technical field [0001] The invention relates to a method and a system for recovering and preparing sec-butyl acetate in heavy hydrocarbons above C12 as a by-product of sec-butyl acetate. 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 environmentally friendly. It is a relatively mature process. In the reaction product of C4 ol...

AI Technical Summary

Problems solved by technology

At present, there are two main methods for refining heavy hydrocarbons above C12 in the industry. One is to cut and separate heavy hydrocarbons above C12. The degree of separation is not thorough, and only part of the sec-butyl acetate can be recovered; the other method If the heavy hydrocarbons above C12 are subjected to ordinary rectification and separation, and the temperature at the bottom of the tower reaches above 220°C, medium-pressure steam must be used as the heat source medium. The investment and cost of recycling are relatively high, and the recovered sec-butyl acetate Contains certain C12 components, the separation is not complete

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