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Method for recovering waste solvents of ethyl acetate, n-butyl alcohol and n-heptane

A technology of ethyl acetate and n-heptane, which is applied to the waste solvent of n-butanol and n-heptane, and in the field of ethyl acetate recovery, can solve the problems of not reaching the maximum utilization of waste recovery and a large number of azeotropes, and achieve reduction Loss, good stability, and the effect of improving extraction efficiency

Active Publication Date: 2020-11-03
ANQING XINXIANGRUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recovering waste solvents of ethyl acetate, n-butanol and n-heptane, to solve the problem that the mixture has many azeotropes and direct distillation cannot achieve the maximum utilization of waste recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get ethyl acetate-n-butanol-n-heptane waste solvent 100kg, moisture is 15.6%, and its chemical composition and content are as follows:

[0025] Butanol n-heptane ethyl acetate other GC content / % 42.3 29.2 26.8 1.7

[0026] (1) Adopt continuous removal of moisture in the waste solvent by molecular sieves (recycling after heating), make the mass content of moisture in the solvent less than 1%, obtain only ethyl acetate-n-butanol-n-heptane mixture 82.2kg ;

[0027] (2) Pass the mixture of ethyl acetate-n-butanol-n-heptane obtained in step (1) into the first rectification column, under normal pressure, the temperature of the tower bottom is 120°C, the temperature at the top of the tower is 66°C, reflux Carry out azeotropic rectification under 4, tower still obtains the n-butanol 33.8kg of content 99.3%, and tower top is the azeotropic mixture of ethyl acetate and n-heptane;

[0028] (3) The azeotropic mixture obtained in step (2) is passed in...

Embodiment 2

[0031] Get ethyl acetate-butanol-n-heptane waste solvent 100kg, moisture is 18.5%, and its chemical composition and content are as follows:

[0032] Butanol n-heptane ethyl acetate other GC content / % 36.9 32.4 28.9 1.8

[0033] (1) adopt continuously to remove the moisture in the waste solvent by molecular sieve (recycling after heating), make the mass content of moisture in the solvent be lower than 1%, obtain the mixture 79.4kg that only contains ethyl acetate-n-butanol-n-heptane ;

[0034] (2) Pass the mixture of ethyl acetate-n-butanol-n-heptane obtained in step (1) into the first rectification column, under normal pressure, the temperature of the tower bottom is 125°C, the temperature at the top of the tower is 67°C, reflux Carry out azeotropic rectification under 4, tower still obtains the n-butanol 28.1kg of content 99.2%, and tower top is the azeotropic mixture of ethyl acetate and n-heptane;

[0035] (3) The azeotropic mixture obtained ...

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PUM

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Abstract

The invention discloses a method for recovering a waste solvent of ethyl acetate, n-butyl alcohol and n-heptane, which comprises the following steps: (1) reducing the mass content of water in the solvent to obtain a mixture only containing ethyl acetate, n-butyl alcohol and n-heptane; (2) introducing the mixture of ethyl acetate, n-butyl alcohol and n-heptane into a first rectifying tower for azeotropic distillation to obtain n-butyl alcohol at the bottom of the tower and an azeotropic mixture of ethyl acetate and n-heptane at the top of the tower; (3) introducing the azeotropic mixture of ethyl acetate and n-heptane into a second rectifying tower, adding a mixed extractant composed of an extractant and an ionic liquid, and carrying out extractive distillation to obtain n-heptane at the tower top and a mixture of ethyl acetate and the mixed extractant at the tower bottom; and (4) continuously introducing the mixture of ethyl acetate and the extraction agent into a solvent recovery tower to obtain ethyl acetate at the top of the tower and a mixed extraction agent at the bottom of the tower. According to the method, ethyl acetate, n-butyl alcohol and n-heptane can be efficiently separated.

Description

technical field [0001] The invention relates to the field of chemical distillation and purification, in particular to a method for recovering waste solvents of ethyl acetate, n-butanol and n-heptane. Background technique [0002] At present, ethyl acetate, n-butanol and n-heptane are widely used in the fields of rubber, pharmaceuticals, paints, etc. They are often used in large quantities as organic solvents, and other substances, especially water, are inevitably added during use. Such mixed solvents are harmful to the environment. Because there are many azeotropic components, recovery is troublesome and often difficult to handle. In order to reduce environmental pollution and save resources, it is necessary to recycle and utilize this kind of mixture waste liquid. [0003] Under normal pressure, n-butanol and water can form an azeotrope, and its azeotropic temperature is 92.7 ° C. In the azeotropic composition, n-butanol: water = 0.575: 0.425 (mole fraction), and ethyl ace...

Claims

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Application Information

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IPC IPC(8): C07C67/48C07C69/14C07C29/76C07C31/12C07C7/00C07C9/15C07C67/54C07C7/08
CPCC07C67/48C07C29/76C07C7/005C07C67/54C07C7/08C07C69/14C07C31/12C07C9/15Y02P20/54
Inventor 李向峰李星星高豹黄安宁桂园芬马刚王成林
Owner ANQING XINXIANGRUI CHEM CO LTD
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