Method for preparing high-purity methyl acetate from low-purity methyl acetate

A low-purity methyl acetate technology, which is applied in the field of producing high-purity methyl acetate, can solve the problems of difficult extraction agent recovery, complex process, and high cost, and achieve low equipment investment, simple process flow, and low energy consumption in the process Effect

Active Publication Date: 2013-07-03
HUNAN XIANGWEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Gu Zhenggui of Nanjing Normal University and others used a mixture of polyols (such as glycerol, ethylene glycol) and water as an extractant, and separated methyl acetate and methanol aqueous solution from methyl acetate by adopting a multi-stage cross-flow liquid-liquid extraction method. High-purity methyl acetate (referring to CN101955427A, CN101898963A) is produced in the waste liquid, but this method has the disadvantages of difficult extraction agent recovery, complex process, high energy consumption, and high cost

Method used

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  • Method for preparing high-purity methyl acetate from low-purity methyl acetate
  • Method for preparing high-purity methyl acetate from low-purity methyl acetate
  • Method for preparing high-purity methyl acetate from low-purity methyl acetate

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Effect test

Embodiment 1

[0053] (a) refer to figure 1 As shown in the process flow, low-alcohol and low-purity methyl acetate 1 (wherein the mass fraction of methyl acetate is 91.3%, methanol is 0.9%, and the rest is water and other impurities) is added from the lower part of extraction tower A, and deionized water 2 is extracted from The middle part of tower A is added, and the low-alcohol and low-purity methyl acetate 1 is subjected to countercurrent extraction. The upper part of the extraction tower A obtains the raffinate 4 of methyl acetate, and its component mass fraction is methyl acetate 93.0% and methanol 0.053%. The extraction solution 3 containing methyl acetate and methanol in the tower kettle is subjected to rectification and purification to recover methyl acetate and methanol. Various control parameters of the liquid-liquid extraction: the volume ratio of the amount of deionized water 2 added to the low-alcohol low-purity methyl acetate is 0.9:1, and the extraction temperature is 5°C.

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Embodiment 2

[0057] (a) refer to figure 1 As shown in the process flow, low-alcohol and low-purity methyl acetate 1 (wherein the mass fraction of methyl acetate is 87.5%, methanol is 1.95%, and the rest is water and other impurities) is added from the lower part of extraction tower A, and deionized water 2 is extracted from The middle part of tower A is added, and the low-alcohol and low-purity methyl acetate 1 is subjected to countercurrent extraction, and the raffinate 4 of methyl acetate is obtained in the upper part of the extraction tower A, and the mass fraction of its components is 92.5% of methyl acetate and 0.055% of methanol. The extraction solution 3 containing methyl acetate and methanol in the tower kettle carries out rectification and purification to reclaim methyl acetate and methanol. Various control parameters of liquid-liquid extraction: the volume ratio of deionized water 2 added to low-alcohol and low-purity methyl acetate is 1.7:1, and the extraction temperature is 10°...

Embodiment 3

[0061] (a) refer to figure 1As shown in the process flow, low-alcohol and low-purity methyl acetate 1 (wherein the mass fraction of methyl acetate is 72.8%, methanol is 4.95%, and the rest is water and other impurities) is added from the lower part of extraction tower A, and deionized water 2 is extracted from The middle part of tower A is added, and the low-alcohol and low-purity methyl acetate 1 is subjected to countercurrent extraction, and the raffinate 4 of methyl acetate is obtained in the upper part of the extraction tower A, and its component mass fraction is methyl acetate 91.5% and methanol 0.14%. The extraction solution 3 containing methyl acetate and methanol in the tower kettle is subjected to rectification and purification to recover methyl acetate and methanol. The control parameters of the liquid-liquid extraction: the volume ratio of the amount of deionized water 2 added to the low-alcohol low-purity methyl acetate is 2.5:1, and the extraction temperature is 2...

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Abstract

The present invention provides a method for preparing high-purity methyl acetate from low-purity methyl acetate, comprising the steps of liquid-liquid extraction, azeotropic distillation and extractive distillation, wherein water is the extractant for methyl acetate/methanol, and acetic acid is the extractant for water. Further, for the high alcohol low-purity methyl acetate, such as waste liquid (or waste gas) from the production of polyvinyl alcohol can be roughly distilled and then purified by the method. The method has the advantages of simple technological processes, small investment in equipment, stable operation and easy control, low energy consumption, and preparing high purity methyl acetate and stable quality.

Description

technical field [0001] The invention relates to a method for recovering, purifying or refining methyl acetate, more specifically, relates to a method for preparing high-purity methyl acetate from a mixture containing methyl acetate, methanol, water and traces of other impurities. Background technique [0002] Crude methyl acetate (purity about 75%, methanol about 25%) is mainly used for organic solvents required in the production process of resins, coatings, printing inks, paints, and adhesives, or as a grease extractant, used in the manufacture of artificial leather, but because The methanol content in the crude methyl ester is high, and its application fields are limited. [0003] High-purity methyl acetate has high solubility and environmental protection. It can partially or completely replace industrial solvents such as acetone and ethyl acetate in industrial applications such as tanning, solvents and thinners. Its application fields continue to expand. Due to restricti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/58C07C67/54
Inventor 刘振辉向龙刚贺正龙刘永杰肖勤建李卫华周采华杨俊程米亮赵利启李自启李思俊侯英杰
Owner HUNAN XIANGWEI
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