Method for co-producing o-chlorobenzyl chloride, o-chlorobenzyl dichloride and o-chlorobenzyl trichloride through chlorination of o-chlorotoluene
A technology of o-chlorodichlorobenzyl and o-chlorotrichlorobenzyl, which is applied in the fields of chemical instruments and methods, organic chemistry, preparation of halogenated hydrocarbons, etc. It can solve the inconvenient control of reaction conditions, low product purity, and low reaction conversion rate and other problems, to achieve the effect of suppressing side reactions, high product purity, and high reaction conversion rate
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[0021] The present invention will be described in further detail below in conjunction with specific examples, and the implementation scope of the present invention is not limited thereto.
[0022] The invention discloses a method for chlorination of o-chlorotoluene to co-produce o-chlorobenzyl, o-chlorodichlorobenzyl and o-chlorotrichlorobenzyl, comprising the following steps:
[0023] 1) Pump o-chlorotoluene with a purity of more than 99% to the high-level tank, and then use a vacuum pump to pump 2.4t of o-chlorotoluene in the high-level tank into the chlorination kettle, open the reaction tail gas hydrochloric acid absorption system to vacuumize, and keep the inside of the kettle The slight negative pressure is about -0.02~-0.03Mpa, and the jacket steam is opened to slowly raise the temperature of the kettle to 80~100°C, preferably to 90°C. Turn on the steam of the chlorine gasifier to control the water temperature of the gasifier at about 75°C. After the reaction kettle is...
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