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Method for batch extracting rectified purified tetrahydrofuran

A technology of tetrahydrofuran and extractive distillation, applied in the direction of organic chemistry, can solve the problems of increasing the load of extractive distillation tower and solvent recovery tower, energy consumption and equipment investment, and expensive extraction agent, so as to reduce temperature and improve product quality. High, low-cost effect

Inactive Publication Date: 2006-04-19
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0008] There are certain problems in the above various methods, especially the high price of the extractant and the large amount of use. At present, 1,4-butanediol is the most economical and the best extractant for separation, but the larger solvent ratio increases The load, energy consumption and equipment investment of extractive distillation tower and solvent recovery tower are relatively large

Method used

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  • Method for batch extracting rectified purified tetrahydrofuran
  • Method for batch extracting rectified purified tetrahydrofuran

Examples

Experimental program
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Embodiment

[0015] A rectification tower with an inner diameter of 25mm and an effective packing height of 1m, with a 3mm×3mm high-efficiency stainless steel θ ring packing inside, has a theoretical plate number of 30, and the operating pressure of the rectification tower is normal pressure. The tower kettle is a 250ml three-necked bottle, and 100ml of raw materials (tetrahydrofuran with a water content of 12.7wt%) are added to the tower kettle. Turn on the electric heating mantle, keep total reflux for 40 minutes, control the temperature at the top of the tower at 62-64°C, and control the temperature at the bottom of the tower at 64-70°C. Then add 150ml of 1,2-propanediol extractant from the top of the tower at a rate of 60ml / h, and continue to maintain total reflux for 0.5h. The temperature at the top of the tower is controlled at 66°C, and the temperature at the bottom of the tower is controlled at 80-190°C. Then the product is extracted at a rate of 3 with a reflux ratio. When the tem...

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Abstract

A process for refining tetraphdrofuran is disclosed. Its system is composed of rectifying tower, pump, extractant storage tank, condenser, reflux tank and product storage tank. Its preparing steps includes adding the azeotrope or azeotrope-similar mixture of tetraphdrofuran and water to rectifying tower, full reflux reaction, adding 1,2-propanediol as extractant, continuous full reflux reaction, tapping high-purity (99.7%) tetrahpdrofuran from tower top, tapping water from tower top at particular temp, and recovering high-purity 1,2-propanediol.

Description

technical field [0001] The invention relates to a method for intermittently extracting, rectifying and refining tetrahydrofuran, which belongs to the separation technology of the azeotropic mixture of tetrahydrofuran and water. Background technique [0002] Tetrahydrofuran, also known as 1,4-oxirane (THF for short), is a valuable organic solvent with excellent performance. It is widely used in chemical and pharmaceutical production. It is often used as a reactive solvent and is known as "universal solvent". Commonly used in the surface treatment of surface coatings, protective coatings, inks, extractants and artificial leather. In the pharmaceutical industry, it can be used in the production of Kebiqing, progesterone, Lifu Leisu and so on. Has good evaporation properties. Can be used in the precision tape industry and in adhesives. In addition, it is also used as a raw material for the synthesis of various chemical products, such as nylon 66, polytetrahydrofuran, etc. Un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/08
Inventor 许松林王惠媛
Owner TIANJIN UNIV