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Method and device for separating impurities in sec-butyl acetate with methanol serving as azeotrope agent by adopting solvent recycling system

A sec-butyl acetate recovery system technology, applied in the field of separation of impurities in sec-butyl acetate, can solve the problems of high energy consumption for separation and low purity of sec-butyl acetate, and achieve high purity and increased profit margins

Active Publication Date: 2017-05-10
HUNAN ZHONGCHUANG CHEM
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  • Description
  • Claims
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Problems solved by technology

[0009] The above patents have all studied the separation of C8 olefins or heavy hydrocarbons in sec-butyl acetate, and water is used as an entrainer to carry out azeotropic separation of C8 olefins in sec-butyl acetate, but the yield of sec-butyl acetate is the highest. Can reach more than 92%, the purity of the recovered sec-butyl acetate is not very high, and there is a problem of high energy consumption for separation

Method used

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  • Method and device for separating impurities in sec-butyl acetate with methanol serving as azeotrope agent by adopting solvent recycling system
  • Method and device for separating impurities in sec-butyl acetate with methanol serving as azeotrope agent by adopting solvent recycling system
  • Method and device for separating impurities in sec-butyl acetate with methanol serving as azeotrope agent by adopting solvent recycling system

Examples

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Effect test

Embodiment 1

[0064] Such as figure 1As shown, the sec-butyl acetate 1 containing impurity is sent into the first azeotropic distillation tower 2 with the speed of 10t / h, wherein, the composition of this mixed material is: water 0.20%, sec-butanol 0.01%, sec-acetic acid Butyl ester 99.29%, C8 olefin 0.50%, water, sec-butanol, part of sec-butyl acetate and C8 olefin are steamed to the top of the tower, after being condensed by condenser 4, stratification is carried out in reflux tank 5, and the water phase is separated by 0.02t / The speed of h is discharged, and the oil phase is refluxed. Wherein, the operating conditions of the first azeotropic distillation column 2 are: the top pressure is normal pressure, the top temperature is 87 ° C, and the reflux ratio is 4.5. The first azeotropic distillation column The mixed material 8 containing sec-butyl acetate and C8 olefins in the bottom of the distillation tower is sent to the second azeotropic rectification tower 9 at a speed of 9.98t / h, and...

Embodiment 2

[0067] Such as Figure 4 As shown, the sec-butyl acetate 1 containing impurities is sent into the second azeotropic distillation column 9 at a speed of 10t / h, wherein the composition of the mixed material is: 40.20% sec-butyl acetate, 59.80% C8 olefins, And add entrainer methyl alcohol 10, the feed inlet of methyl alcohol is arranged at the 10th tray place below the sec-butyl acetate mixture feed inlet, wherein, the mass ratio of the amount of methyl alcohol added and the amount of C8 olefins is 1: 1. The operating conditions of the second azeotropic distillation column 9 are: the pressure at the top of the column is normal pressure, the temperature at the top of the column is 63°C, the reflux ratio is 10, and sec-butyl acetate falls into the bottom of the column as a product at a rate of 4.02t / h speed extraction, C8 olefins and methanol form an azeotrope and evaporate from the top of the tower. After condensation, part of it is refluxed, and part is sent to the washing tower ...

Embodiment 3

[0070] Such as figure 1 As shown, the sec-butyl acetate 1 containing impurities is sent into the first azeotropic rectification column 2 at a speed of 10t / h, wherein the composition of the mixed material is: water 5.00%, sec-butyl acetate 44.55%, C8 50.45% olefins, water, part of sec-butyl acetate and C8 olefins are steamed to the top of the tower, after being condensed by the condenser 4, stratification is carried out in the reflux tank 5, the water phase is discharged at a speed of 0.5t / h, and the oil phase is refluxed, Wherein, the operating conditions of the first azeotropic rectification tower 2 are: the tower top pressure is normal pressure, and the tower top temperature is 76 ℃, and the reflux ratio is 5.7, and the first azeotropic rectification tower bottom contains sec-butyl acetate, The mixed material of C8 olefins is sent into the second azeotropic rectification column 9 with the speed of 9.5t / h, and add entrainer methyl alcohol 10, the feed inlet of methyl alcohol...

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Abstract

The invention provides a method and a device for separating impurities in sec-butyl acetate with methanol serving as an azeotrope agent by adopting a solvent recycling system. According to the method, the impurities contained in sec-butyl acetate are separated with methanol serving as the azeotrope agent. By means of the method, the technical problems that the separation degree of sec-butyl acetate and C8 olefins is low, the purity of separated sec-butyl acetate is low, and the yield of sec-butyl acetate is low in the prior art are solved successfully. The purity of sec-butyl acetate separated with the technology reaches 99.9% or above and reaches the medicine level, the yield of sec-butyl acetate reaches 99% or above, the purity of methanol obtained after recycling reaches 99.9% or above, the content of impurities contained in water at the bottom of a methanol recovery tower is 0.1% or below, and meanwhile, the method is low energy consumption in the separation process, adopts a simple procedure and is easy to operate. The azeotrope agent, namely, methanol, can be recycled, and the cost is saved.

Description

technical field [0001] The invention relates to a method and a device for separating impurities in sec-butyl acetate by using methanol as an entrainer with a solvent recovery system. 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 olefin...

Claims

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Application Information

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IPC IPC(8): C07C67/54C07C69/14
CPCC07C67/54C07C69/14
Inventor 黄能武张小明孙李林刘郁东申文义
Owner HUNAN ZHONGCHUANG CHEM
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