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A method for extracting and rectifying separation of acetone and isopropyl ether mixture

A technology of extractive distillation and extractive distillation column, which is applied in the field of separation and purification in the chemical industry, can solve the problems of large amount of extractant, low separation efficiency, complex process, etc., and achieve the effect of less investment in equipment, high purity and simple process

Active Publication Date: 2018-11-23
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN104478712A discloses a method for extracting and rectifying separation of methyl acetate and methanol, using 1-hexyl-3-methylimidazole chloride and 1-ethyl-3-methylimidazole bromide as extractants, through two One-step extractive distillation is used for separation, but this method carries out two-step extractive distillation, and the process is complex and difficult to operate
[0006] Chinese patent CN102795957A discloses a method for extracting and rectifying the separation of m-methylethylbenzene and p-methylethylbenzene, using nitrogen-containing compounds as extractants, but the extraction agent has low separation efficiency for m-methylethylbenzene and p-methylethylbenzene, and the amount of extractant used is large , high energy consumption

Method used

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  • A method for extracting and rectifying separation of acetone and isopropyl ether mixture
  • A method for extracting and rectifying separation of acetone and isopropyl ether mixture
  • A method for extracting and rectifying separation of acetone and isopropyl ether mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The feed temperature is 30° C., the flow rate is 1000 kg / h, the pressure is 1 atm absolute pressure, and the feed contains 30% acetone and 70% isopropyl ether. The number of theoretical plates of the extractive distillation column is 20, the inner diameter of the tower is 0.29m, the feeding plate of acetone and isopropyl ether mixture is 10, the flow rate of the extractant ethylene glycol is 600kg / h (solvent ratio is 0.6), and the extractant feed The number of plates is 4; the number of theoretical plates of the extraction agent recovery tower is 15, the inner diameter of the tower is 0.28m, and the number of feed plates is 8. The operating pressure of the extractive distillation tower is 1 atm absolute pressure, the reflux ratio is 0.8, the tower top temperature is 60.3 ° C, and the tower bottom temperature is 100.3 ° C; the extractant recovery tower operating pressure is 1 atm absolute pressure, the reflux ratio is 0.3, and the tower top temperature is 70.5°C, the tem...

Embodiment 2

[0040] The feed temperature is 30° C., the flow rate is 1000 kg / h, the pressure is 1 atm absolute pressure, and the feed contains 50% acetone and 50% isopropyl ether. The number of theoretical plates of the extractive distillation column is 35, the inner diameter of the tower is 0.32m, the feed plate of the acetone and isopropyl ether mixture is 18, the flow rate of the extractant ethylene glycol is 1000kg / h (the solvent ratio is 1), and the extractant feed The number of plates is 6; the number of theoretical plates of the extraction agent recovery tower is 25, the inner diameter of the tower is 0.3m, and the number of feed plates is 15. The operating pressure of the extractive distillation tower is 1 atm absolute pressure, the reflux ratio is 0.9, the tower top temperature is 56.2 ° C, and the tower bottom temperature is 94.9 ° C; the extractant recovery tower operating pressure is 1 atm absolute pressure, the reflux ratio is 1.0, and the tower top temperature is 68.1°C, the ...

Embodiment 3

[0044] The feed temperature is 30° C., the flow rate is 1000 kg / h, the pressure is 1 atm absolute pressure, and the feed contains 70% acetone and 30% isopropyl ether. The number of theoretical plates of the extractive distillation column is 40, and the inner diameter of the tower is 0.35m. The number of plates is 10; the number of theoretical plates of the extraction agent recovery tower is 50, the inner diameter of the tower is 0.26m, and the number of feed plates is 25. The operating pressure of the extractive distillation tower is 1 atm absolute pressure, the reflux ratio is 2, the tower top temperature is 52.5 ° C, and the tower bottom temperature is 90.8 ° C; the extractant recovery tower operating pressure is 1 atm absolute pressure, the reflux ratio is 1.2, and the tower top temperature is 65.1°C, the temperature at the bottom of the tower is 197.5°C. The purity of acetone after separation is 99.99%, the recovery rate of acetone is 99.99%, the purity of isopropyl ether...

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Abstract

The invention relates to a method for extraction rectifying separation of an acetone and isopropyl ether mixture and a device suitable for the method. According to the method, ethylene glycol is used as a solvent, the acetone and isopropyl ether mixture is preheated by tower top steam of an extraction agent recovery tower, then enters an extraction rectifying tower from the middle part of the extraction rectifying tower, and makes full contact with an extraction agent introduced from the upper part of the extraction rectifying tower; after extraction rectifying, acetone is extracted from the top of the extraction rectifying tower, and an extraction agent and isopropyl ether mixture enters the extraction agent recovery tower from the bottom of the extraction rectifying tower. After effective separation, isopropyl ether is extracted from the top of the extraction agent recovery tower, and the extraction agent is recycled after being extracted from the bottom of the extraction agent recovery tower. In the process, a heat integration method is adopted, the amount of condensation water is saved, and energy consumption is reduced. The method has the advantages of simple process, high purity of the product after separation and the like, and the used extraction agent can remarkably improve the relative volatility of acetone and isopropyl ether, is easy to recover and good in chemical thermal stability.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, and in particular relates to a method for extracting and rectifying a mixture of acetone and isopropyl ether. 【Background technique】 [0002] Acetone is mainly used as a solvent in industries such as explosives, plastics, rubber, fiber, leather, grease, spray paint, etc. It can also be used as a solvent for the synthesis of enone, acetic anhydride, iodoform, polyisoprene rubber, methacrylic acid, etc. An important raw material for methyl ester, chloroform, epoxy resin and other substances. Isopropyl ether is a good solvent for animal, vegetable and mineral oils, and a good solvent for paraffin wax and resins. In industry, isopropyl ether and other solvents are often mixed and used in the dewaxing process of paraffin-based oils. As a solvent, it is used in pharmaceuticals, smokeless gunpowder, paint and paint cleaning, etc. [0003] In the process of chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/83C07C49/08C07C41/42C07C43/04B01D11/04
CPCB01D11/04C07C41/42C07C45/83C07C49/08C07C43/04Y02P20/10Y02P20/50
Inventor 王英龙赵永滕许希彩耿雪丽朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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