Preparation of p-Hydroxybenzaldehyde by Hydrolysis of Diazonium Salts Using Rotating Packed Bed

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• 作者：Qiaoling ZHANG^a ; Youzhi LIU ; ^a ; ^{qlzhang_65@sohu.com} ; Guangming LI^a ; Junping LI^a
• 关键词：impinging stream-rotating packed bed ; coil pipe ; diazonium salt ; p-hydroxybenzaldehyde
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2011
• 出版时间：February 2011
• 年：2011
• 卷：19
• 期：1
• 页码：140-144
• 全文大小：266 K

文摘

A new type of reactor, featured with impinging stream-rotating packed bed (IS-RPB) and coil pipes, was designed and used to prepare p-hydroxybenzaldehyde (PHB) by hydrolysis from diazonium salts. The influence of operating parameters, such as reaction temperature, reaction time and high gravity factor, on the yield of PHB was investigated. Compared with the traditional kettle-type reactor, the yield of PHB with the new reactor is increased significantly and the reaction time is much shorter. Under the optimum conditions, the yield of PHB is increased from 51 % to 84.1 % . The reactor offers an opportunity for replacing the traditional batch mode operation with a continuous process.