Device capable of improving purity of raw materials

Abstract

The invention relates to a device capable of improving the purity of raw materials, solves the problems that in the prior art, olefin impurities and a target product are relatively difficult to separate, so that serious influence on the purity of the raw materials and poor economic benefit are caused are solved. The device comprises a concentrating tower and a heat exchanger. The device is characterized in that a cold material inlet of the heat exchanger is connected with a heat-exchange feeding pipeline; a cold material outlet of the heat exchanger is connected with a concentrating middle part feeding port through a concentrating middle part feeding pipeline; sideline producing ports of the concentrating tower are connected with a hot material inlet of the heat exchanger through a concentrating sideline producing pipeline; the hot material outlet of the heat exchanger is connected with a raw material tank through a heat-exchange discharging pipeline; a top discharging port of the concentrating tower is connected with a concentrating top discharging pipeline; and a bottom discharging port of the concentrating tower is connected with an inlet of a bottom extraction pump through a concentrating bottom discharging pipeline. According to the device involved in the invention, the design is reasonable and the structure is compact; n-butene in remaining C4 olefin can be separated; andthe n-butene in the raw materials can react fully, so that the cost of the raw materials can be reduced and the economic benefit of the product can be improved.

Description

Technical field [0001] The invention belongs to the technical field of chemical raw material production, and specifically relates to a device capable of fully reacting n-butene in the raw material, reducing the raw material cost, and improving the economic benefit of the product, which can increase the purity of the raw material. Background technique [0002] The reaction process of preparing sec-butyl acetate from n-butene in acetic acid and mixed C4 olefins will be accompanied by side reactions of n-butene polymerization and produce C8 olefins, which are difficult to separate; and the boiling point of such olefin impurities is the same as that of the target product. Very close, it is difficult to separate in the existing reaction system, greatly increasing the difficulty of refinement of sec-butyl acetate, and also seriously affecting the purity of the raw materials. In addition, since the n-butenes in the mixed C4 olefins also participate in the reaction, when the reaction eff...

AI Technical Summary

Problems solved by technology

[0002] The reaction process of acetic acid and n-butene in mixed C4 olefins to prepare sec-butyl acetate will be accompanied by the side reaction of n-butene polymerization, and generate C8 olefins that are difficult to separate; and the boiling point of such olefin impurities is the same as the boiling point of the target product It is very close, and it is difficult to separate in the existing reaction system, which greatly increases the difficulty of refining sec-butyl acetate, and also seriously affects the purity of raw materials

In addition, because n-butene in mixed C4 olefins also participates in the reaction, when the reaction effect is not good, the content of n-butene in the remaining C4 olefins will increase, which further leads to a decrease in the purity of raw materials

Therefore, in order to maximize the reaction effect of n-butene in raw material C4 olefins and solve the problem of low raw material purity, it is necessary to improve the existing raw material purification device

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