- A benzoyl chloride to the preparation of 3, 5 - dichloro benzoyl chloride (by machine translation)
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The invention provides a process for preparing to benzoyl chloride for 3, 5 - dichloro benzoyl chloride method, the method is carried out in three steps, the reaction conditions are in the 50 - 150 °C, benzoyl chloride as the starting material by sulfonation, chlorinated, desulfurization to obtain 3, 5 - dichloro formyl chlorine thick, can be obtained through the rectification after the content is more than 99.5% target product 3, 5 - dichloro benzoyl chloride. The method not only raw material is simple and easy to obtain, by adding amides with the metal salt catalyst after the catalyst reaction temperature is greatly reduced, the whole no waste water is produced, exhaust gas HCl adopts the water absorbed to prepare hydrochloric acid, sulfur dioxide using 30% liquid caustic soda absorbed to prepare sodium sulfite, rectification stage only produces a small amount of solid residue, it is easy to realize industrial. (by machine translation)
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