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Method for separating allyl alcohol and water by extractive distillation with N-methyl-pyrrolidone

A methylpyrrolidone and extractive distillation technology, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of high consumption of entrainer, long process flow, large process energy consumption, etc. Good economic and social benefits, simple separation process, low energy consumption

Inactive Publication Date: 2014-07-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] U.S. Patent (US 1279059) discloses that a U.S. Dow Chemical Company uses benzene as an entrainer to extract and separate allyl alcohol and water. By optimizing operating conditions, allyl alcohol above 99.0w%t is obtained. There is a co- Disadvantages of high boiling agent consumption and high process energy consumption
[0006] Chinese patent (CN86104244) discloses that Japan Showa Denko Co., Ltd. uses potassium phosphate salt to salt out allyl alcohol and aqueous solution, and then separates allyl alcohol by precise distillation to obtain more than 99.5w%t of allyl alcohol. This process has been industrialized at present. However, there are disadvantages such as long process flow, large investment and complicated operation.

Method used

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  • Method for separating allyl alcohol and water by extractive distillation with N-methyl-pyrrolidone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Allyl alcohol and water raw material liquid 2 enter the middle part of the extractive distillation column 3 with a flow rate of 1000kg / hr, and the extractant N-methylpyrrolidone 1 enters the upper part of the extractive distillation column 3 according to the volume ratio of 2.5:1, and the theoretical plate number of this column is 40 blocks, the pressure at the top of the tower is 100kPa, the temperature at the top of the tower is 100°C, and the temperature at the bottom of the tower is 160°C. After the steam at the top of the tower is condensed by the condenser 5, water 5 with a product purity of 99.4wt% is extracted with a reflux ratio of 1:1. , the extractant solution 7 rich in allyl alcohol at the bottom of the tower enters the middle part of the solvent recovery tower 8, the number of theoretical plates of this tower is 50, the pressure at the top of the tower is 10kPa, the temperature at the top of the tower is 50°C, and the temperature at the bottom of the tower is...

Embodiment 2

[0028] Allyl alcohol and water raw material liquid 2 enter the middle part of the extractive distillation column 3 with a flow rate of 1000kg / hr, and the extractant N-methylpyrrolidone 1 enters the upper part of the extractive distillation column 3 according to a volume ratio of 3:1, and the theoretical plate number of this column is 42 blocks, the pressure at the top of the tower is 103kPa, the temperature at the top of the tower is 102°C, and the temperature at the bottom of the tower is 162.6°C. After the steam at the top of the tower is condensed by the condenser 5, water 5 with a product purity of 99.4wt% is extracted with a reflux ratio of 3:1. , the extraction agent solution 7 rich in allyl alcohol at the bottom of the tower enters the middle part of the solvent recovery tower 8, the number of theoretical plates of this tower is 55, the pressure at the top of the tower is 15kPa, the temperature at the top of the tower is 52°C, and the temperature at the bottom of the towe...

Embodiment 3

[0030] Allyl alcohol and water raw material liquid 2 enter the middle part of the extractive distillation column 3 with a flow rate of 1000kg / hr, and the extractant N-methylpyrrolidone 1 enters the upper part of the extractive distillation column 3 according to a volume ratio of 4:1, and the theoretical plate number of this column is 45 blocks, the pressure at the top of the tower is 105kPa, the temperature at the top of the tower is 105°C, and the temperature at the bottom of the tower is 165°C. After the steam at the top of the tower is condensed by the condenser 5, water 5 with a product purity of 99.4wt% is extracted with a reflux ratio of 5:1. , the extraction agent solution 7 rich in allyl alcohol at the bottom of the tower enters the middle part of the solvent recovery tower 8, the number of theoretical plates of this tower is 60, the pressure at the top of the tower is 20kPa, the temperature at the top of the tower is 55°C, and the temperature at the bottom of the tower ...

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Abstract

The invention discloses a method of separating allyl alcohol and water by extractive distillation with N-methyl-pyrrolidone, comprising the following steps: adding N-methyl-pyrrolidone used as an extractant and raw material liquid of allyl alcohol and water separately into an extractive distillation column according to a certain solvent ratio, removing water component at the top of the extractive distillation column, then obtaining more than 99.5% allyl alcohol product at the top of a solvent recovery column, and returning the extractant recycled at a column bottom into the extractive distillation column for recycling. The method provided by the invention adopts N-methyl-pyrrolidone as the extractant and separates allyl alcohol and water solution by the extractive distillation, and is an efficient and energy-saving separation process.

Description

technical field [0001] The invention belongs to the technical method of chemical separation process, and relates to a method for separating allyl alcohol and water by extracting and rectifying with N-methylpyrrolidone. Background technique [0002] In the production process of epichlorohydrin produced by propylene acetate method, allyl alcohol solution is an intermediate product of allyl alcohol produced by hydrolysis of propylene acetate, and its composition is about 70wt% of propylene alcohol, 30wt% of water and a small amount of allyl Aldehyde and acetic acid, according to the annual output of 50,000 tons of epichlorohydrin production equipment, the annual production of nearly 30,000 tons of intermediate product acrylic alcohol. [0003] Allyl alcohol, also known as allyl alcohol, is a colorless transparent liquid with a boiling point of 97.1°C. High-purity allyl alcohol is an intermediate in medicine, pesticides and spices. The main derivatives are also used in the synth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C33/03C07C29/84
Inventor 华超白芳迪建东
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI