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Composite extractant for separating azeotrope of acetone methanol azeotrope and use method thereof

A composite extraction agent, acetone methanol technology, applied in the separation/purification of carbonyl compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of high concentration of acetone methanol raw materials, low recovery rate, environmental pollution, etc. problems, to achieve the effect of easy recovery and recycling, broad application prospects, and improved extraction and separation effects

Inactive Publication Date: 2011-09-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies have problems such as polluting the environment, high cost or low recovery rate
[0004] The patent application with the publication number CN101492345A proposes a method for extracting and separating acetone methanol by adding salt. The salts used are all monovalent salts. Although high-purity products can be obtained, the requirements for the raw material concentration of acetone methanol are high, and it is not suitable for large changes in concentration. raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to CaCl 2 The mass concentration of salt is 3.5% to prepare CaCl 2 Salt-water compound extractant.

[0018] The theoretical plate number of the extractive distillation column is 30 (the plate number is counted from top to bottom), and the CaCl 2 The salt-water composite extractant is added from the 5th theoretical plate, and the flow rate is 42mL / min, and the mixture of acetone and methanol (the concentration of acetone is 40wt%, and the concentration of methanol is 60wt%) is added from the 16th theoretical plate, and the flow rate is 60mL / min. The reflux ratio is controlled to be 4, and the temperature at the top of the extractive distillation tower is 56.0-56.5°C. Analysis of the overhead fraction of the extractive distillation column showed that the mass fraction of acetone was 95.2%, and the recovery rate of acetone was 85.2%.

[0019] The theoretical plate number of the recovery tower is 20, and the discharge from the extractive distillation tower ente...

Embodiment 2

[0022] According to Mg(NO 3 ) 2 The mass concentration of salt is 3% to prepare Mg(NO 3 ) 2 Salt-water compound extractant.

[0023] The theoretical plate number of the extractive distillation column is 35 (the plate number is counted from top to bottom), Mg(NO 3 ) 2 The salt-water composite extractant is added from the 6th theoretical plate, and the flow rate is 45mL / min, and the acetone-methanol mixture (the concentration of acetone is 45wt%, and the concentration of methanol is 55wt%) is added from the 18th theoretical plate, and the flow rate is 30mL / min, The reflux ratio is controlled to be 2.5, and the temperature at the top of the extractive distillation tower is 56.0-56.5°C. Analysis of the overhead fraction of the extractive distillation column showed that the mass fraction of acetone was 96.2%, and the recovery rate of acetone was 86.7%.

[0024] The theoretical plate number of the recovery tower is 15, and the discharge from the extractive distillation column ...

Embodiment 3

[0027] According to CaCl 2 and MgCl 2 The mass ratio is 1: 1, and the mass concentration of the double salt is 2.5% to prepare CaCl 2 and MgCl 2 Double salt-water compound extractant.

[0028] The theoretical plate number of the extractive distillation column is 25 (the plate number is counted from top to bottom), and CaCl 2 and MgCl 2The double salt-water composite extractant is added from the 5th theoretical plate with a flow rate of 51mL / min, and the acetone methanol mixture (the concentration of acetone is 50wt%, and the concentration of methanol is 50wt%) is added from the 13th theoretical plate with a flow rate of 51mL / min , the reflux ratio is controlled to be 3, and the temperature at the top of the extractive distillation tower is 56.0-56.5°C. Analysis of the overhead fraction of the extractive distillation column showed that the mass fraction of acetone was 96.9%, and the recovery rate of acetone was 87.4%.

[0029] The theoretical plate number of the recovery ...

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Abstract

The invention relates to a composite extractant for separating an azeotrope of acetone and methanol and a use method thereof, belonging to the technical field of separation utilization of industrial waste materials. The composite extractant consists of a main extractant and an additive, wherein the additive is a high-valence cation ionic salt, a compound salt or an ionic liquid. According to the invention, an extraction and rectification tower and a solvent recovery tower are used so as to separate a mixture of acetone and methanol; through introducing the salt additive, the separation capacity of the extractant is effectively improved, and the relative volatilities of the acetone and methanol are increased, thus a high-recovery product is obtained, above 95% acetone is obtained by virtue of primary extraction and rectification of the mixture of acetone and methanol with 40-70wt% acetone, the recovery of the acetone is above 85%, and the concentration of methanol is above 95%; and simultaneously, the salt additive has an extremely-low steam pressure and almost non-volatility, which is convenient for recovery and recycling of the composite extractant.

Description

technical field [0001] The invention belongs to the technical field of separation and utilization of industrial waste, and relates to a composite extractant used for the separation of acetone and methanol azeotropes. Background technique [0002] Both acetone and methanol are important industrial raw materials and reagents. Acetone can be used not only as a solvent in industries such as explosives, plastics, rubber, fiber, tanning, grease, and spray paint, but also as a solvent for the synthesis of ketene, acetic anhydride, iodoform, polyisoprene rubber, methacrylic acid, and methyl ester. , Chloroform, epoxy resin and other important raw materials. Methanol can be used to manufacture various organic products such as formaldehyde, acetic acid, methyl chloride, methyl ammonia, dimethyl sulfate, etc., and is also one of the important raw materials for pesticides and medicines. At the same time, methanol can be used as a new type of clean fuel to add to gasoline after deep pro...

Claims

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Application Information

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IPC IPC(8): C07C29/84C07C31/04C07C45/83C07C49/08
Inventor 宋文波张丽丽孟繁雨
Owner JILIN UNIV
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