Method for preparing m-dichlorobenzene by o-dichlorobenzene isomerization

A technology of m-dichlorobenzene and o-dichlorobenzene, which is applied in the field of organic matter preparation, can solve the problems of equipment corrosion, complex process, difficult regeneration, etc., and achieve the effect of reducing corrosion, high stability and improving conversion rate

Inactive Publication Date: 2017-11-03
JIANGSU LONGCHANG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the synthesis of m-dichlorobenzene with non-dichlorobenzene as raw materials is not only complicated, but also the product purity is not high, so it has been eliminated
[0003] Meta-dichlorobenzene can also be produced by catalytic isomerization among the three isomers of dichlorobenzene. The catalysts used in this process are currently mainly liquid acid catalysts such as aluminum trichloride and ferric chloride. This type of catalyst has disadvantages such as low stability, corrosion to equipment, and difficulty in regeneration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The method for preparing m-dichlorobenzene by isomerizing o-dichlorobenzene in this embodiment, the silicon-aluminum modified HZSM-5 catalyst with a ratio of o-dichlorobenzene to silicon-aluminum of 25:1 is used at a filler ratio of 1:2, a gas-liquid ratio 60, airspeed 1h -1 , The reaction temperature was 420°C, and m-dichlorobenzene was reacted under the condition of 5 hours of reaction, the conversion rate of ortho-dichlorobenzene was 72.8%, and the yield of m-dichlorobenzene was 48.6%.

Embodiment 2

[0013] In this example, the method for preparing m-dichlorobenzene by isomerizing o-dichlorobenzene is to mix ortho-dichlorobenzene and silica-aluminum sulfate modified HZSM-5 catalyst at a filler ratio of 1:2, a gas-liquid ratio of 60, and a space velocity of 1 h -1 , The reaction temperature was 410°C, and m-dichlorobenzene was obtained under the condition of reaction for 5 hours. The conversion rate of ortho-dichlorobenzene was 78.3%, and the yield of m-dichlorobenzene was 52.8%.

Embodiment 3

[0015] In this example, the method for preparing m-dichlorobenzene by isomerizing o-dichlorobenzene, using o-dichlorobenzene and modified MoS 2-Me / HZSM-5 catalyst at a filler ratio of 1:2, a gas-liquid ratio of 60, and a space velocity of 0.5 h -1 , the reaction temperature was 400°C, and m-dichlorobenzene was reacted under the condition of 6 hours of reaction, the conversion rate of ortho-dichlorobenzene was 79.2%, and the yield of m-dichlorobenzene was 54.6%.

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Abstract

The invention relates to a method for preparing m-dichlorobenzene by o-dichlorobenzene isomerization. O-dichlorobenzene and a modified HZSM-5 catalyst react for 5-6 h at a packing ratio of 1:2, a vapor liquid ratio of 60, an airspeed of 0.5-1 h<-1> and a reaction temperature of 400-420 DEG C. The method has the advantages that in the method for preparing m-dichlorobenzene by o-dichlorobenzene isomerization, an appropriate solid acid catalyst is adopted, that is, a modified HSM-5 catalyst is adopted, and the catalyst is high in stability and reusable, can greatly improve m-dichlorobenzene conversion rate and also greatly reduces corrosion to a device.

Description

technical field [0001] The invention belongs to the technical field of organic matter preparation, in particular to a method for preparing m-dichlorobenzene by isomerizing o-dichlorobenzene. Background technique [0002] As an intermediate for synthetic dyes, fungicides, and herbicides, m-dichlorobenzene is widely used in industries such as medicine and pesticides. At the same time, m-dichlorobenzene is also an important organic solvent. At present, the synthesis methods of m-dichlorobenzene are divided into those using non-dichlorobenzene as raw materials and using ortho-dichlorobenzene or p-dichlorobenzene as raw materials according to different raw materials. Among them, the synthesis of m-dichlorobenzene with non-dichlorobenzene as raw material is not only complicated in process, but also the product purity is not high, so it has been eliminated. [0003] Meta-dichlorobenzene can also be produced by catalytic isomerization among the three isomers of dichlorobenzene. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/358C07C25/08
CPCC07C17/358C07C25/08
Inventor 张剑宇吴春江王映辉
Owner JIANGSU LONGCHANG CHEM
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