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A production method, the technology of o-chlorotoluene, applied in the production field of o-chlorotoluene, can solve the problem of high content of o-chlorotoluene, and achieve the effect of simple method and easy operation
Inactive Publication Date: 2012-07-25
江苏优普生物化学科技股份有限公司
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Problems solved by technology
[0002] In the existing production method of o-chlorotoluene, due to reasons such as the catalyst used in the reaction, the content ratio of p-chlorotoluene and o-chlorotoluene in the product cannot meet the demand for high o-chlorotoluene content
Method used
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Embodiment 1
[0012] A kind of production method of p-chlorotoluene, comprises the following steps:
[0013] (1) Chlorination of toluene: Put toluene in a chlorination kettle and add a catalyst, and pass chlorine gas at 50-65°C (for example, 50°C, 55°C, 65°C) for chlorination reaction for 18-20 hours, toluene and The molar ratio of chlorine gas is 1:1.2. The catalyst used in the reaction is mixed with the following components by weight percentage, then mixed with silica sol, and then treated at 80~120°C (for example, 80°C, 100°C, 120°C) for 4~6 hours be made of:
[0014] Alumina 30%
[0015] Antimony trichloride 70%; the amount of silica sol is 9% of the total weight of alumina and antimony trichloride.
[0016] Catalyst consumption is 2% of toluene weight.
[0017] After the reaction is finished, the chlorinated solution is filtered to remove the catalyst through a plate and frame filter press to obtain a crude mixed chlorotoluene liquid;
[0018] (2) Removal of toluene: the crude mixe...
Embodiment 2
[0023] The catalyst used in the reaction is prepared by mixing the following components by weight percentage, then mixing it with silica sol, and then treating it at 80~120°C (for example, 80°C, 100°C, 120°C) for 4~6 hours:
[0024] Alumina 40%
[0025] Antimony trichloride 60%; the amount of silica sol is 12% of the total weight of alumina and antimony trichloride.
[0026] Catalyst consumption is 3% of toluene weight.
[0027] All the other are with embodiment 1. In the total amount of p-chlorotoluene and o-chlorotoluene in the final product, o-chlorotoluene reaches more than 44%, and the content of o-chlorotoluene product reaches more than 99.5% after rectification.
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Abstract
The invention discloses a production method of ortho-chlorotoluene. The production method comprises toluene chlorinating, toluene removing and chorine mixed toluene rectifying steps. The method comprises the following steps of: during toluene chlorinating, putting toluene into a chlorinating kettle, and adding a catalyst; introducing chorine gas at the temperature of 40-60 DEG C for undergoing a chlorinating reaction; mixing the catalyst used in the reaction by using aluminum oxide and trichloride antimony; mixing with silica sol; and treating at the temperature of 80-120 DEG C for 4-6 hours. The method is simple and convenient, and is easy to operate; and in the total amount of parachlorotoluene and ortho-chlorotoluene in a final product, the ortho-chlorotoluene is over 44 percent. After rectification, the content of the product is over 99.5 percent.
Description
technical field [0001] The present invention relates to a kind of production method of o-chlorotoluene. Background technique [0002] In the existing production method of o-chlorotoluene, due to reasons such as the catalyst used in the reaction, the content ratio of p-chlorotoluene and o-chlorotoluene in the product cannot meet the demand for high o-chlorotoluene content. Contents of the invention [0003] The object of the present invention is to provide a kind of production method of the high ortho-chlorotoluene content of ortho-chlorotoluene in the product. [0004] Technical solution of the present invention is: [0005] A production method of o-chlorotoluene, comprising the steps of chlorination of toluene, removal of toluene, and rectification of mixed chlorotoluene, is characterized in that: when toluene is chlorinated, toluene is put into a chlorination kettle and a catalyst is added, and at 40-60 Chlorine gas is introduced at ℃ to carry out chlorination reaction...
Claims
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Application Information
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