Method for separating isobutanol from isobutyl acetate

A technology of isobutyl acetate and separation method, which is applied in the field of chemical separation, can solve the problems of resource waste, limitation, and separation difficulty, and achieve the effect of easy separation and increased relative volatility

Active Publication Date: 2017-11-10
济南信兆昌化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The boiling point of isobutanol is 107.9°C, and the boiling point of isobutyl acetate is 118.0°C. There is little difference between the boiling points of the two, and there is an azeotropic phenomenon between isobutanol and isobutyl acetate, and the azeotropic temperature is 107.4 ℃, the mass fraction of the light component isobutanol is 55wt% when azeotropic, which brings difficulties to the separation in the actual production process
Containing the practical application of the isobutyl acetate of a small amount of isobutanols simultaneously also can be limited, not only can be the waste of resources, also easily cause environmental pollution

Method used

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  • Method for separating isobutanol from isobutyl acetate

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Effect test

Embodiment 1

[0023] A separation method of isobutanol and isobutyl acetate, comprising the following contents and operating steps:

[0024] (1) Use a first-stage extractive distillation tower 1 with a total of 34 theoretical plates, add the separation aid methyl benzoate from the fourth theoretical plate on the top of the tower, and add the raw materials to be separated from the 28th theoretical plate for extraction Rectification, when the vapor-liquid balance is reached, the steam in the top of the tower is condensed through the primary condenser 2, and the liquid obtained by collecting the condensate in the primary reflux tank 3 is used as the production liquid, which is isobutanol; wherein, the raw material to be separated The mass ratio of isobutanol and isobutyl acetate in the medium is 55:45, the processing capacity of the raw material to be separated is 100 kg / hr, and the feeding condition is normal pressure bubble point feeding; the addition amount of the separating agent methyl ben...

Embodiment 2

[0029] A separation method of isobutanol and isobutyl acetate, comprising the following contents and operating steps:

[0030] (1) Use the first extractive distillation column 1 with a total of 34 theoretical plates, add the separating agent methyl benzoate from the fourth theoretical plate on the top of the tower, add the raw materials to be separated from the 28th theoretical plate, and perform extraction Rectification, when the vapor-liquid is balanced, the steam in the top of the tower is condensed through the first-stage condenser 2, and the first-stage reflux tank 3 collects the liquid obtained by condensation and reflux as the production liquid, which is isobutanol;

[0031] Among them, the mass ratio of isobutanol and isobutyl acetate in the raw material to be separated is 20:80, the processing capacity of the raw material to be separated is 100kg / hr, and the feeding condition is normal pressure bubble point feeding; the addition of the separating agent methyl benzoate ...

Embodiment 3

[0038] A separation method of isobutanol and isobutyl acetate, comprising the following contents and operating steps:

[0039] (1) Use the first rectification tower 1 with a total of 34 theoretical plates, add the separation aid methyl benzoate from the fourth theoretical plate at the top of the tower, and add the raw materials to be separated from the 28th theoretical plate for extraction Rectification, when the vapor-liquid balance is reached, the steam in the top of the tower is condensed through the first condenser 2, and the condensate is collected by the primary reflux tank 3 as the production liquid, which is isobutanol; wherein, the isobutanol in the raw material to be separated The mass ratio of alcohol and isobutyl acetate is 80:20, the processing capacity of raw materials to be separated is 100 kg / hr, and the feeding condition is normal pressure bubble point feeding; the addition of separating agent methyl benzoate is 160 kg / hr, The feeding condition is 80°C under n...

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Abstract

The invention discloses a method for separating isobutanol from isobutyl acetate. According to the method, a screening separation promoter is added, an extraction distillation method is implemented to separate isobutanol from isobutyl acetate, the relative volatility of isobutanol and isobutyl acetate is changed, separation of isobutanol from isobutyl acetate is achieved, isobutanol and isobutyl acetate of relatively high purity are prepared, the added separation promoter can be recycled, and high-efficiency and high-purity separation of isobutanol from isobutyl acetate is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for separating isobutanol and isobutyl acetate. Background technique [0002] Isobutyl acetate (English Isobutyl acetate), also known as n-propyl acetate, is the esterification product of acetic acid and 2-butanol, and its molecular formula is C 6 h 12 o 2 , a water-white liquid with soft fruity ester aroma, slightly soluble in water, miscible in ethanol and ether, miscible with various organic solvents such as alcohol, ether and hydrocarbons, mainly used as nitro lacquer and perchlorethylene Thinner for lacquer, solvent for nitrocellulose and lacquer, can be used as an alternative solvent for butyl acetate and methyl isobutyl ketone, and can also be used as a fragrance component. It can also be used as a diluent for plastic printing paste, an extractant in the pharmaceutical industry, etc. [0003] The boiling point of isobutanol is 107.9°C,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/54C07C31/12C07C29/84
CPCC07C29/84C07C67/54C07C69/14C07C31/12
Inventor 陈中合李玉川王瑞
Owner 济南信兆昌化工科技有限公司
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