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Production technology of 1,2,4-trichlorobenzene

A production process, a technology for trichlorobenzene, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of high cost, difficult treatment of process by-products, and difficult separation, and achieves low cost and reduced cost. Process by-products, the effect of less process by-products

Inactive Publication Date: 2016-08-03
SICHUAN FOURSTAR BIOTECH RANDD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of difficult separation, high cost and difficult handling of process by-products in the production of 1,2,4-trichlorobenzene in the prior art, and proposes a new 1,2,4-trichlorobenzene Advanced production technology, after directional chlorination, catalytic treatment, rechlorination, rectification and other steps, the product conversion rate is improved, the production cost is reduced, and the by-products of the process are less, which is suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of production technology of 1,2,4-trichlorobenzene, comprises the following steps:

[0034] A. Directional chlorination

[0035] Passing chlorine gas into benzene, under the action of a catalyst, directional chlorination to obtain a mixture of p-dichlorobenzene and o-dichlorobenzene; the ratio of the amount of chlorine gas to benzene is 1.8:1;

[0036] B. Catalytic treatment

[0037] Add a Lewis acid catalyst to the p-dichlorobenzene and o-dichlorobenzene mixture obtained in step A for processing;

[0038] C. Rechlorination

[0039] Chlorine gas is passed into the mixed solution obtained by catalytic treatment in step B, and chlorination is obtained to obtain a mixture of 1,2,4-trichlorobenzene, p-dichlorobenzene and o-dichlorobenzene; the mass ratio of the chlorine gas to the mixed solution is 0.5:1;

[0040] D. Distillation

[0041] After rectifying the mixture obtained in step C, the 1,2,4-trichlorobenzene product and unreacted dichlorobenzene mixture are...

Embodiment 2

[0043] A kind of production technology of 1,2,4-trichlorobenzene, it is characterized in that: comprise the following steps:

[0044] A. Directional chlorination

[0045] Passing chlorine gas into benzene, under the action of a catalyst, directional chlorination to obtain a mixture of p-dichlorobenzene and o-dichlorobenzene; the ratio of the amount of chlorine gas to benzene is 2.2:1;

[0046] B. Catalytic treatment

[0047] Add a Lewis acid catalyst to the p-dichlorobenzene and o-dichlorobenzene mixture obtained in step A for processing;

[0048] C. Rechlorination

[0049] Chlorine gas is passed into the mixed solution obtained by catalytic treatment in step B, and chlorination is obtained to obtain a mixture of 1,2,4-trichlorobenzene, p-dichlorobenzene and o-dichlorobenzene; the mass ratio of the chlorine gas to the mixed solution is 2:1;

[0050] D. Distillation

[0051] After rectifying the mixture obtained in step C, the 1,2,4-trichlorobenzene product and unreacted d...

Embodiment 3

[0054] A kind of production technology of 1,2,4-trichlorobenzene, it is characterized in that: comprise the following steps:

[0055] A. Directional chlorination

[0056] Passing chlorine gas into benzene, under the action of catalyst, directional chlorination to obtain a mixture of p-dichlorobenzene and o-dichlorobenzene; the ratio of chlorine gas to benzene is 2:1;

[0057] B. Catalytic treatment

[0058] Add a Lewis acid catalyst to the p-dichlorobenzene and o-dichlorobenzene mixture obtained in step A for processing;

[0059] C. Rechlorination

[0060] Chlorine gas is passed into the mixed solution obtained by catalytic treatment in step B, and chlorination is obtained to obtain a mixture of 1,2,4-trichlorobenzene, p-dichlorobenzene and o-dichlorobenzene; the mass ratio of the chlorine gas to the mixed solution is 1:1;

[0061] D. Distillation

[0062] After rectifying the mixture obtained in step C, the 1,2,4-trichlorobenzene product and unreacted dichlorobenzene mix...

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Abstract

The invention discloses a production technology of 1,2,4-trichlorobenzene, and belongs to the technical field of fine chemical engineering. The technology comprises the steps of 1 directional chlorination, wherein chlorine is introduced into benzene, and a mixture of p-dichlorobenzene and o-dichlorobenzene is obtained through directional chlorination under the action of a catalyst; 2 catalysis treatment, wherein a lewis acid catalyst is added into the p-dichlorobenzene and o-dichlorobenzene mixture obtained in the step 1 for treatment; 3 rechlorination, wherein chlorine is introduced into mixed liquid obtained through catalysis treatment in the step 2, and chlorination is conducted to obtain a mixture of 1,2,4-trichlorobenzene, p-dichlorobenzene and o-dichlorobenzene; 4 rectification, wherein the mixture obtained in the step 3 is rectified to obtain a 1,2,4-trichlorobenzene product and an unreacted dichlorobenzene mixture, and the dichlorobenzene mixture is taken as a raw material to be repeatedly used in the step 2. The production technology has the advantages of being simple in method, low in cost, high in yield, few in technological by-product and suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a production process of 1,2,4-trichlorobenzene, which belongs to the technical field of fine chemicals. Background technique [0002] 1,2,4-Trichlorobenzene is an important fine organic intermediate, widely used in medicine, pesticides, dyes, additives and other fields, and can be used as solvent for recrystallization of high melting point substances, coolant for electrical equipment, lubricating oil Additives, degreasing agents, oil-soluble dye solvents, termite repellants, etc., are also used as raw materials for the preparation of 2,5-dichlorophenol. In recent years, the application and development of its downstream products are in the ascendant at home and abroad, and new uses emerge in an endless stream, especially the demand for high-purity 1,2,4-trichlorobenzene is stronger, and it has become a fine chemical product that is in short supply in the international market. [0003] At present, the main production methods for...

Claims

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Application Information

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IPC IPC(8): C07C17/12C07C17/383C07C25/08C07C25/10
CPCC07C17/12C07C17/383C07C25/08C07C25/10
Inventor 李舟何路涛卢刚唐昊宋剑峰王东梅张华王蕾
Owner SICHUAN FOURSTAR BIOTECH RANDD CORP
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