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Process for producing high purity 1,2,4-trichlorobenzene and para-dichlorobenzene

A production method and technology of trichlorobenzene are applied in the production of 2,4-trichlorobenzene and para-dichlorobenzene, in the field of high purity, and can solve problems such as process sewage, long production process flow, and unsuitability for industrial production.

Inactive Publication Date: 2006-01-04
陈华国
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  • Claims
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Problems solved by technology

At present, there are two production processes for the production of p-dichlorobenzene in China: one is the by-product of producing monochlorobenzene; the other is high-purity p-dichlorobenzene produced by fractional distillation and cold crystallization after directional chlorination of pure benzene. The process is long and produces a large amount of process sewage, which is not suitable for industrial production

Method used

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  • Process for producing high purity 1,2,4-trichlorobenzene and para-dichlorobenzene

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Embodiment

[0006] Put 1.8-2.3 tons of monochlorobenzene into the secondary chlorination kettle, add antimony trisulfide and ferric trichloride respectively, each accounting for 0.04-0.12% of the amount of monochlorobenzene, react with the chlorine gas from the main chlorination kettle, and the temperature is 50 ℃. When reacting at -80 degrees, hydrochloric acid gas is generated and the entrained monochlorobenzene is separated and recovered by the cooling separator. The hydrochloric acid gas is absorbed by bubbling water, and then absorbed by the falling film tower, and then absorbed by the water ejector, and then recycled to make 28 -30% concentration of by-product hydrochloric acid, inert gas evacuated. The above-mentioned monochlorobenzene etc. are put into the main chlorination still for 4-6 hours of reaction in the auxiliary chlorination still. The liquid chlorine is vaporized into gaseous chlorine, which is put into the main chlorination kettle with an hourly flow rate of 20-24 cubi...

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Abstract

The present invention relates to oriented chlorination and fractionating process of chlorobenzene to produce high purity 1, 2, 4-trichlorobenzene and para-dichlorobenzene. Chlorobenzene and catalyst are thrown into auxiliary chlorination reactor and reacted with chlorine gas at certain temperature to produce hydrochloric acid gas, after reaction for certain time, the chlorinated liquid is fed to coarse fractionating tower for heating fractionation to fractionate mixed dichlorobenzene, and mixed dichlorobenzene is heated in the dichlorobenzene rectifying tower to fractionate para-dichlorobenzene of 99.5-99.8 % purity. Mixed dichlorobenzene and catalyst are reacted with chlorine inside main chlorinating reactor at certain temperature for certain time, the product is heated and fractionated in coarse fractionating tower to obtain semi-finished product, and the semi-finished product is heated and fractionated in the trichlorobenzene fractionating tower to obtain 1, 2, 4-trichlorobenzene product of 99.5 % purity.

Description

Technical field: [0001] The preparation method of high-purity 1, 2, 4-trichlorobenzene and para-dichlorobenzene of the present invention relates to the directional chlorination and fractionation of monochlorobenzene catalyst to prepare high-purity 1, 2, 4-trichlorobenzene and para-dichlorobenzene Chlorobenzene, the products are used in the production of pesticides, medicines, dyes and public health. Background technique: [0002] Existing traditional technology for producing trichlorobenzene at home and abroad, using hexahexahexanone ineffective for alkaline hydrolysis or pyrolysis to generate a variety of trichlorobenzene and a small amount of mixtures such as dichlorobenzene, tetrachlorobenzene, pentachlorobenzene and hexachlorobenzene. After fractional distillation, low-purity trichlorobenzene containing 70%-80% of 1, 2, 4-trichlorobenzene can be obtained, which can be refined and fractionated to obtain high-purity 1, 2, and 4 trichlorobenzene, which is very difficult, so...

Claims

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Application Information

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IPC IPC(8): C07C25/10C07C17/12C07C17/383
Inventor 陈华国吕国兴
Owner 陈华国
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