Batch extractive distillation separation method of isopropyl ether-isopropanol mixture

A technology of extractive distillation and separation method, which is applied in the field of separation of isopropyl ether-isopropanol mixture, which can solve the problems of non-separation and difficulty in obtaining pure isopropyl ether, and achieve easy control, environmental protection and separation effect Good results

Inactive Publication Date: 2013-06-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

These methods all contain isopropanol, and diisopropyl ether and isopropanol can form a polar azeotrope under normal pressure, which cannot be separated by general rectification methods
For the isopropyl ether-isopropanol system, the conventional separation method is rectification at atmospheric pressure, but when the mass fraction of isopropyl ether reaches 83.7%, the relative volatility is close to 1, and it is difficult to obtain a purity greater than 90% by conventional separation methods. isopropyl ether

Method used

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  • Batch extractive distillation separation method of isopropyl ether-isopropanol mixture

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Effect test

Embodiment 1

[0019] Raw materials to be separated: isopropyl ether (99.9%), isopropanol (99.9%)

[0020] Extractant: Ethylene glycol methyl ether (99.8%)

[0021] Batch extractive distillation tower (packed tower): the separation process is as follows:

[0022] Tower inner diameter: Φ40mm (built-in θ4×4 mesh ring packing) solvent ratio: 3:1

[0023] Reflux ratio: 1~4

[0024] Taft kettle temperature: 60~125℃

[0025] by figure 1 The shown flow device adopts intermittent operation to separate the mixture of isopropyl ether and isopropanol. The specific process is as follows: the diameter of the extractive distillation tower used is Φ40mm, and theta mesh ring packing is installed inside. The packing layer is 2000mm. At 150mm, add 1500ml of isopropanol-isopropyl ether mixture (including 83.7% isopropyl ether and 16.3% isopropyl ether, both in mass fraction) to the kettle of the heating tower, add the extractant ethylene glycol methyl ether to the High slot. Turn on the power supply of t...

Embodiment 2

[0027] Raw materials to be separated: isopropyl ether (99.9%), isopropanol (99.9%)

[0028] Extractant: Ethylene glycol methyl ether (99.8%)

[0029] Batch extractive distillation tower (packed tower): the separation process is as follows:

[0030] Tower inner diameter: Φ40mm (built-in θ4×4 mesh ring packing)

[0031] Solvent ratio: 3:1

[0032] Reflux ratio: 1~4

[0033] Taft kettle temperature: 60~125℃

[0034] by figure 1The shown flow device adopts intermittent operation to separate the mixture of isopropyl ether and isopropanol. The specific process is as follows: the diameter of the extractive distillation tower used is Φ40mm, and theta mesh ring packing is installed inside. The packing layer is 2000mm. At 150mm, add 1500ml of isopropanol-isopropyl ether mixture (including 85.5% isopropyl ether and 14.5% isopropyl ether, both of which are mass fractions) in the heating tower kettle, add the extractant ethylene glycol methyl ether to the High slot. Turn on the powe...

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Abstract

The invention discloses a batch extractive distillation separation method of isopropyl ether-isopropanol mixture, and relates to a batch extractive distillation method of isopropyl ether. In the method, an extractive distillation tower, a heating kettle at the bottom of the extractive distillation tower, a condensing unit connected to the top of the extractive distillation tower and a distillation device composed of a receiving tank are adopted. The technological process of the method is as follows: adding raw materials at normal pressure in one step; and continuously adding ethylene glycol monomethyl ether serving as an extraction agent, performing batch operation of the extractive distillation tower, controlling the temperature of the top of the tower and a reflux ratio, and sequentially extracting isopropyl ether and isopropanol. The batch extractive distillation separation method has the advantages that by taking ethylene glycol monomethyl ether as an extraction agent, relative volatility of an isopropyl ether-isopropanol is improved, the problem of poor solubility when ethanediol is taken as the extraction agent, the operation is convenient and easy to control, the cyclic utilization of a solvent is realized, the energy consumption is reduced, the cost is reduced and the separation effect is good, so that the method has good economy and is favorable for environmental friendliness.

Description

technical field [0001] The invention relates to a method for intermittently extracting and rectifying isopropyl ethers, in particular to a method for separating isopropyl ether-isopropanol mixture. Background technique [0002] Isopropyl ether is a good solvent for animal, vegetable and mineral oils, and can be used to extract nicotine from tobacco; it is also a good solvent for resins in the chemical industry, and is often used in dewaxing processes. Diisopropyl ether has a high octane number and antifreeze, and can be used as a gasoline blending agent. At present, the methods for preparing diisopropyl ether include: separation of by-products of isopropanol, direct hydration of propylene, and synthesis of alkenes. These methods all contain isopropanol, and diisopropyl ether and isopropanol can form a polar azeotrope under normal pressure, which cannot be separated by general rectification methods. For the isopropyl ether-isopropanol system, the conventional separation met...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/42
Inventor 张志刚李文秀杨磊陈立峰
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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