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Separation technology used in 2-vinylpyridine preparation process

A technology for the production process of vinylpyridine, which is applied in the field of separation technology, can solve the problems of long reaction time, high energy consumption, and low efficiency, and achieve the effects of saving electricity and steam and shortening the reaction time

Active Publication Date: 2012-09-19
淄博张店东方化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are still some deficiencies in the current 2-vinylpyridine production process, such as the old separation process (process goal: 2-hydroxyethylpyridine is separated from the unreacted raw material 2-picoline) is to use intermittent surface Evaporation technology, the evaporation temperature is 50-100°C, the evaporation volume is 3000L each time, and the evaporation time is about 10h. The advantage is that the process is simple and the equipment is simple, but the disadvantage is that the energy consumption is large, the reaction time is too long, and the efficiency is low.

Method used

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  • Separation technology used in 2-vinylpyridine preparation process
  • Separation technology used in 2-vinylpyridine preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0013] The feed rate of 2-vinylpyridine is 600L / min, the temperature of separation tank 1 is 52°C, the pressure is 110Pa, the temperature of rising film separator 2 is 53°C, the pressure is 112Pa, the temperature of distillation tower 3 is 51°C, the pressure is 111Pa, and the falling film separator 4 Temperature 52°C, pressure 111Pa, rising membrane separator 2 light component test: 2-picoline 93%, water 6.4%, 2-hydroxyethylpyridine 0.02%, formaldehyde 0.4%. Rising membrane separator 2 heavy component test : 2-hydroxyethylpyridine 75%, 2-picoline 23%, water 0.3%, formaldehyde 0.2%, high boiler 0.9%. The heavy component enters the falling film separator 4, and the falling film separator 4 is recombined and tested: 97% of 2-hydroxyethylpyridine, 1.3% of high boilers, 0.5% of 2-picoline, 0.2% of water, and 0.1% of formaldehyde.

[0014] The gas phase outlets of the separation tank 1 , the rising film separator 2 and the distillation tower 3 are all connected to a gas recovery dev...

Embodiment 2

[0017] The feed rate of 2-vinylpyridine is 600L / min, the temperature of separation tank 1 is 74°C, the pressure is 120Pa, the temperature of rising film separator 2 is 75°C, and the pressure is 121Pa, the temperature of distillation tower 3 is 77°C, the pressure is 125Pa, and the falling film separator 4 Temperature 75°C, pressure 122Pa, rising membrane separator 2 light component test: 2-picoline 94%, water 5.4%, 2-hydroxyethylpyridine 0.03%, formaldehyde 0.4%. Rising membrane separator 2 heavy component test : 2-hydroxyethylpyridine 74%, 2-picoline 24%, water 0.3%, formaldehyde 0.2%, high boiler 0.9%. The heavy component enters the falling film separator 4, and the falling film separator 4 is recombined and analyzed: 2-hydroxyethylpyridine 96.5%, high boilers 1.8%, 2-picoline 0.5%, water 0.1%, formaldehyde 0.2%.

[0018] The gas phase outlets of the separation tank 1 , the rising film separator 2 and the distillation tower 3 are all connected to a gas recovery device 5 throu...

Embodiment 3

[0021] The feed rate of 2-vinylpyridine is 600L / min, the temperature of separation tank 1 is 99°C, the pressure is 128Pa, the temperature of rising film separator 2 is 97°C, the pressure is 127Pa, the temperature of distillation column 3 is 97°C, the pressure is 128Pa, and the falling film separator 4 Temperature 98°C, pressure 127Pa, rising membrane separator 2 light component test: 2-picoline 95%, water 4.4%, 2-hydroxyethylpyridine 0.03%, formaldehyde 0.4%. Rising membrane separator 2 heavy component test : 2-hydroxyethylpyridine 76%, 2-picoline 22%, water 0.3%, formaldehyde 0.3%, high boiler 0.8%. The heavy component enters the falling film separator 4, and the falling film separator 4 is recombined and tested: 2-hydroxyethylpyridine 97.5%, high boilers 0.8%, 2-picoline 0.4%, water 0.3%, formaldehyde 0.1%.

[0022] The gas phase outlets of the separation tank 1 , the rising film separator 2 and the distillation tower 3 are all connected to a gas recovery device 5 through pi...

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Abstract

The invention relates to separation technology used in a 2-vinylpyridine preparation process. The separation technology is characterized by including feeding 2-hydroxyethyl pyridine into a separation chamber to be separated after the 2-hydroxyethyl pyridine is in continuous condensation; then enabling the 2-hydroxyethyl pyridine to enter a climbing film separator from the separation chamber; enabling the 2-hydroxyethyl pyridine to enter a distillation tower from the climbing film separator; enabling the 2-hydroxyethyl pyridine to enter a falling film separator from the distillation tower after a flow is regulated; and finally obtaining the 2-vinylpyridine. A continuous feeding mode is adopted, reaction time is shortened, electric power and steam are saved, the climbing film separator is combined with the falling film separator, and particularly, the falling film separator is combined with the distillation tower, so that separation of the 2-vinylpyridine and separation of 2-methylpyridine are maximized.

Description

technical field [0001] The invention relates to a separation process in the production process of 2-vinylpyridine, which belongs to the field of chemical industry. Background technique [0002] There are still some deficiencies in the current 2-vinylpyridine production process, such as the old separation process (process goal: 2-hydroxyethylpyridine is separated from the unreacted raw material 2-picoline) is to use intermittent surface Evaporation technology, the evaporation temperature is 50-100 ℃, each evaporation volume is 3000L, and the evaporation time is about 10h. The advantages are simple process and simple equipment, but the disadvantages are large energy consumption, long reaction time and low efficiency. Contents of the invention [0003] According to the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a separation process in the production process of 2-vinylpyridine, which adopts continuous feeding, short...

Claims

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Application Information

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IPC IPC(8): C07D213/127
Inventor 王宝庆仇传禄孙光福王刚孔凡平
Owner 淄博张店东方化学股份有限公司