Method for extracting 2-picoline and 3-picoline from coking crude benzene

A technology of picoline and coking crude benzene, which is applied in the direction of organic chemistry, can solve the problems of difficult treatment of acidic water and neutralized water, low reaction yield, high reaction temperature, etc., and achieve low cost, simple process flow and equipment corrosion small effect

Active Publication Date: 2014-09-24
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing coal tar extraction process, it is first washed with sulfuric acid, then neutralized with ammonia water, and then refined. The acid water and neutralized water that appear in the process engineering are difficult to handle; while the synthesis process is a set of mature processes, but It has shortcomings such as high reaction temperature and low reaction yield; therefore, it is necessary to develop a method for extracting 2-picoline and 3-picoline with environmental protection and simple operating conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Put the coked crude benzene into the de-xylene tower, carry out negative pressure distillation, control the pressure to be 10KPa, the tower top temperature of the de-xylene tower is 60°C, the bottom temperature is 150°C, the reflux ratio is 2, from the de-xylene Light components, benzene and toluene are produced from the top of the xylene tower, and xylene, 2-picoline, 3-picoline and heavy benzene are produced from the bottom of the tower, xylene, 2-picoline, 3- The picoline and heavy benzene enter the 2-picoline and 3-picoline recovery unit for the recovery of picolines.

[0030] Put the material extracted from the top of the xylene removal tower into the two-benzene light-removal tower, distill at atmospheric pressure, control the top temperature of the two-benzene light-removal tower at 50°C, the temperature at the bottom of the tower at 100°C, and the reflux ratio of 3. Remove the light components in benzene and toluene; put the bottom material from th...

Embodiment 2

[0034] Embodiment 2: Put the coked crude benzene into the de-xylene tower, carry out negative pressure distillation, control the tower internal pressure of the de-xylene tower at 15KPa, the temperature at the top of the tower at 70°C, the temperature at the bottom of the tower at 160°C, and the reflux ratio of 4, from Light components, benzene and toluene are produced from the top of the de-xylene tower, and xylene, 2-picoline, 3-picoline and heavy benzene are produced from the bottom of the de-xylene tower. Xylene, 2-picoline, 3-picoline and heavy benzene enter the 2-picoline and 3-picoline recovery unit to recover methylpyridines;

[0035] The material extracted from the top of the xylene removal tower is put into the two-benzene light-removal tower, and distilled at atmospheric pressure. The temperature at the top of the two-benzene light-removal tower is controlled at 55 ° C, the temperature at the bottom of the tower is at 103 ° C, and the reflux ratio is 4. Remove the li...

Embodiment 3

[0038]Example 3: Put the coked crude benzene into the de-xylene tower, carry out vacuum distillation, control the internal pressure of the de-xylene tower at 20KPa, the temperature at the top of the tower at 80°C, the temperature at the bottom of the tower at 168°C, and the reflux ratio of 5 , extract light components, benzene, toluene from the top of the tower, extract xylene, 2-picoline, 3-picoline and heavy benzene, xylene, 2-picoline, 3-methylpyridine from the bottom of the tower Pyridine and heavy benzene enter the 2-picoline and 3-picoline recovery unit for the recovery of methylpyridines.

[0039] Put the light components, benzene, and toluene extracted from the top of the xylene removal tower into the two benzene removal light tower, and distill at atmospheric pressure.

[0040] Control the top temperature of the two-benzene light removal tower at 60°C, the bottom temperature at 105°C, and the reflux ratio of 6 to remove light components in benzene and toluene; collec...

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PUM

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Abstract

The invention discloses a method for extracting 2-picoline and 3-picoline from coking crude benzene. According to the method, the 2-picoline and the 3-picoline are extracted by taking the coking crude benzene as a raw material, and simultaneously, benzene, methylbenzene and dimethylbenzene are obtained, the utilization rate of the raw material coking crude benzene is increased, and the yield is increased; the technological process of the method is advanced; desalted water can be repeatedly recycled in the whole production process, no waste is generated, environmental problem is avoided, and the method is environment-friendly; and the material has little corrosion on equipment and is low in cost and high in revenue efficiency.

Description

technical field [0001] The invention relates to the field of chemical purification, in particular to a method for extracting 2-picoline and 3-picoline from coking crude benzene. Background technique [0002] 2-Methylpyridine and 3-Methylpyridine are important chemical raw materials and organic intermediates, widely used in fine chemical industries such as medicine, pesticides, spices, dyes, daily chemicals, and feed additives, among which 2-methylpyridine Pyridine is mainly used in the production of pesticide intermediates, herbicides paraquat and diquat, and in the synthesis of special resin polyvinylpyridine and 2-vinylpyridine intermediates; 3-picoline is mainly used in the production of niacin and nicotinamide, It is also used to synthesize a variety of serialized derivative products. With the advancement of science and technology, the new uses of 2-picoline and 3-picoline will continue to be developed and applied. [0003] There are many production processes for 2-pico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D213/16
Inventor 杨辉秦国栋张建梅崔冬梅杨德虎
Owner WEIFANG YUANLI CHEM
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