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Intermittent extractive distillation and separation method for isopropyl ether-isopropanol mixture

A technology of extractive rectification and separation method, applied in the field of intermittent extraction, rectification and separation of isopropyl ether-isopropyl alcohol mixture, can solve the problems of inability to separate and difficult to obtain pure isopropyl ether, etc., achieves easy control, is beneficial to Environmental protection, avoid the effect of poor solubility

Inactive Publication Date: 2013-04-17
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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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  • Intermittent extractive distillation and separation method for isopropyl ether-isopropanol mixture

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Effect test

Embodiment 1

[0022] Raw materials to be separated: isopropyl ether (99.9%), isopropanol (99.9%)

[0023] Extractant: Ethylene glycol methyl ether (99.8%)

[0024] Batch extractive distillation tower (packed tower): the separation process is as follows:

[0025] Tower inner diameter: Φ40mm (built-in θ4×4 mesh ring packing)

[0026] Solvent ratio: 3:1

[0027] Reflux ratio: 1~4

[0028] Taft kettle temperature: 60~125℃

[0029] 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 s...

Embodiment 2

[0031] Raw materials to be separated: isopropyl ether (99.9%), isopropanol (99.9%)

[0032] Extractant: Ethylene glycol methyl ether (99.8%)

[0033] Batch extractive distillation tower (packed tower): the separation process is as follows:

[0034] Tower inner diameter: Φ40mm (built-in θ4×4 mesh ring packing)

[0035] Solvent ratio: 3:1

[0036] Reflux ratio: 1~4

[0037] Taft kettle temperature: 60~125℃

[0038] 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 provides an intermittent extractive distillation and separation method for an isopropyl ether-isopropanol mixture and relates to a distillation and separation method. A device used by the method comprises an extractive distillation tower, a heating kettle and a distillation device, wherein the heating kettle is arranged at the bottom of the extractive distillation tower; and the distillation device is connected to the top of the extractive distillation tower and comprises a condensing device and a receiving tank. The technical process comprises the following steps: adding raw materials at a normal pressure at one time, continuously adding ethylene glycol monomethyl ether to the raw materials as an extracting agent, carrying out intermittent operation on the raw materials by using the extractive distillation tower, controlling a temperature and a reflux ratio at the top of the tower, and extracting isopropyl ether and isopropanol in sequence. The intermittent extractive distillation and separation method for the isopropyl ether-isopropanol mixture, provided by the invention, has the advantages as follows: through using the ethylene glycol monomethyl ether as the extracting agent, the relative volatility of an isopropyl ether-isopropanol system is enhanced, the problem that the solubility is poor when the traditional ethylene glycol is used as the extracting agent is avoided, convenient operation and easy control are achieved, solvents are recycled, energy consumption is reduced, the cost is reduced, a better separating effect and very good economic efficiency are obtained, and the intermittent extractive distillation and separation method is beneficial for environmental protection.

Description

technical field [0001] The invention relates to a rectification separation method, in particular to a batch extraction rectification separation method of 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 method is...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/42C07C31/10C07C29/84
Inventor 张志刚李文秀杨磊陈立峰
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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