New technology for separating isopropanol-isopropyl ether azeotrope by using ionic liquids

A technology of azeotropic mixtures and ionic liquids, applied in the preparation of organic compounds, separation/purification of ethers, preparation of hydroxyl compounds, etc., can solve the problems of large amount of extractant, low yield, difficult to handle, etc., and achieve high yield , good separation effect

Inactive Publication Date: 2015-12-02
UNIV OF JINAN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There are many studies on this azeotrope in many documents, such as using ethylene glycol as the extractant, but the solubility of the extractant in the azeotropic species cannot be ignored, resulting in a large amount of extractant and difficult to handle; Patent No. CN103044215A ado...

Method used

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  • New technology for separating isopropanol-isopropyl ether azeotrope by using ionic liquids
  • New technology for separating isopropanol-isopropyl ether azeotrope by using ionic liquids

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: adopt continuous rectification device, drop into the heating kettle of extractive distillation column isopropanol-isopropyl ether 500L (wherein isopropanol is 0.22%, isopropyl ether is 78%, all are mole percentage), the extraction agent selected for the test was ionic liquid [emim] + [BF 4 ] - , continuously add raw materials and extractant to the extractive distillation tower, the feed rate is 100L / h, 40L / h respectively, open the heat source of the extractive distillation tower and the condensed water of the condenser, wait for the temperature at the top of the extractive distillation tower to be stable After reflux for a period of time, add extractant [emim] to the upper part of the extractive distillation column + [BF 4 ] - , the ratio of extractant to feed is 2:5, when the temperature of the extractive distillation tower is 68.5°C, the isopropyl ether product will be extracted continuously at the top of the extractive distillation tower, and the re...

Embodiment 2

[0013] Embodiment 2: experimental apparatus and operation method are the same as embodiment 1, and extractant adopts [bmim] + [BF 4 ] - .

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Abstract

The invention relates to a rectification separation method, and concretely relates to a new technology for separating isopropanol-isopropyl ether azeotrope by using ionic liquids. The new ionic liquids [emim]<+>[BF4]<-> and [bmim]<+>[BF4]<-> (with the structures shown in figure 1) are adopted in the invention as extractants, and the isopropanol-isopropyl ether azeotrope is separated through adotpign a continuous rectification method. Rectifying towers adopted in the technology comprise an extraction rectifying tower, a solvent recovery tower and other auxiliary devices. The technology comprises the following steps: adding the isopropanol-isopropyl ether azeotrope into the central portion of the extraction rectifying tower, recovering the ionic liquids in the solvent recovery tower, pumping the ionic liquids into the extraction rectifying tower through using a pump in order to realize cycle use, and controlling different temperatures and reflux ratios of the above two towers in order to realize continuous production. The technology breaks use of a traditional solvent glycol as an extractant, improves the relative volatility of isopropanol-isopropyl ether, avoids the problem of poor solubility of traditional glycol as the extractant, and has the advantages of convenient operation, large operation elasticity and continuous production.

Description

technical field [0001] The invention relates to a new process for separating isopropanol-isopropyl ether azeotropic mixture by using ionic liquid, which belongs to the separation technology of isopropanol-isopropyl ether azeotropic mixture. Background technique [0002] Isopropyl alcohol (IPA) is one of the earliest petrochemical products produced in the world. It is mainly used for the production of acetone and as a solvent. There is a side reaction in the production process of isopropyl alcohol to produce isopropyl ether, and isopropyl ether (IPE) It is an important industrial solvent and organic raw material, which is mainly used in medicine, tobacco, environmental protection and chemical industries. Because it has a higher boiling point than common organic solvents such as ether and acetone, it is more beneficial to use isopropyl ether in some extraction operations. In addition to being used as a solvent for grease, wax, mineral oil, some natural resins, and ethyl cellu...

Claims

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Application Information

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IPC IPC(8): C07C31/10C07C29/84C07C43/04C07C41/42
CPCC07C29/84C07C41/42C07C31/10C07C43/04Y02P20/54
Inventor 崔玉马守涛韦兵姜占坤孙国新
Owner UNIV OF JINAN
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