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Method for preparing 2-chloro-1,3-butadiene from 1,3-dichloro-2-butene by adopting thermal cracking

A technology of pyrolysis and butadiene, applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of polluting the environment, wasting materials, etc., to solve environmental pollution problems, increase economic and social benefits obvious effect

Inactive Publication Date: 2010-07-21
CHONGQING HAIDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the incineration is not complete during the incineration process, it will not only waste a lot of materials, but also pollute the environment.

Method used

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  • Method for preparing 2-chloro-1,3-butadiene from 1,3-dichloro-2-butene by adopting thermal cracking
  • Method for preparing 2-chloro-1,3-butadiene from 1,3-dichloro-2-butene by adopting thermal cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The inventive method has the following steps: (see figure 1 )

[0038] (1) Distillation and purification of raw materials

[0039] The raw material (crude 1,3-dichloro-2-butene) is sent to the low-boiling rectification tower through a pipeline to remove low-boiling substances (low-boiling substances refer to substances with a lower boiling point than dichlorobutene, such as benzene, chlorine butyl, acetaldehyde, etc.), the specific process is: put the raw material in the large storage tank of dichlorobutane, transfer it to the circulating dichlorobutane tank through the Φ57 stainless steel pipe, and then enter the low boiling point removal tank from the circulating dichlorobutane tank through the feeding pump Distillation tower.

[0040] According to the conditions in Table 1, the temperature, pressure and vacuum degree in the low-boiling distillation column are controlled to remove low-boiling substances such as benzene and chloroprene.

[0041] Table 1 Refining of ...

Embodiment 2

[0064] In this example, except that the dehydration method of 1,3-dichloro-2-butene in step (1) is different from that of Example 1, the remaining steps and conditions are the same as in Example 1.

[0065] The method of dehydration of 1,3-dichloro-2-butene that removes high-boiling point substances is: remove 1,3-dichloro-2-butene that is high-boiling point substances, and use a dehydration distillation tower to remove a small amount of moisture in the material , enter the dehydration rectification tower and add benzene at the same time, heat the benzene water azeotrope to remove the moisture content in the refined 1,3-dichloro-2-butene, then control the temperature in the high boiling rectification tower according to the conditions in Table 5 , pressure and vacuum, dehydration and rectification, remove the moisture in the crude 1,3-dichloro-2-butene, and obtain refined 1,3-dichloro-2-butene containing dichlorobutane ≥ 95% , The total vapor pressure in the rectification tower...

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Abstract

The invention relates to a method for preparing 2-chloro-1,3-butadiene by rectifying and purifying crude 1,3-dichloro-2-butene (crude dichloro butyl for short) and by adopting thermal cracking. In the method, raw material is rectified and purified to obtain refined 1,3-dichloro-2-butene with the content of dichloro butyl no less than 95 percent, and the refined 1,3-dichloro-2-butene is cracked and purified to obtain the final product of refined 2-chloro-1,3-butadiene with the content of chloroprene no less than 98 percent. By adopting the method, 1,3-dichloro-2-butene can be cracked to obtain useful 2-chloro-1,3-butadiene, thereby the problem of processing the crude 1,3-dichloro-2-butene is solved, and the environment is protected.

Description

technical field [0001] The invention relates to a chemical cracking method, in particular to a method for preparing 2-chloro-1,3-butadiene by thermal cracking of 1,3-dichloro-2-butene. Background technique [0002] 1,3-Dichloro-2-butene, light yellow liquid, boiling point 125-127°C, insoluble in water, soluble in most organic solvents, viscosity at room temperature μ=2.01cp, route of entry: inhalation, ingestion, percutaneous absorption . Harmful to health if inhaled, ingested or absorbed through the skin. Its vapor or smoke is irritating to eyes, skin, mucous membranes and respiratory tract; poisoning manifests as burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting. Its vapor forms an explosive mixture with air, which can cause combustion and explosion when exposed to open fire or high heat, and can react strongly with oxidants. 1,3-Dichloro-2-butene is decomposed by high heat to produce toxic and corrosive gases. In cas...

Claims

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Application Information

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IPC IPC(8): C07C11/167C07C5/44
Inventor 潘先锋郭凌飞伍涛
Owner CHONGQING HAIDA CHEM
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