PROCESS FOR PRODUCING BISPHENOL A AND APPARATUS THEREFOR

摘要

In a process for producing bisphenol A which comprises the reaction step,the step of removing low−boiling components,the concentration step,the crystallization/solid−liquid separation step,the heat melting step,the phenol−removal step,and the granulation step,at least a portion of bisphenol A withdrawn from the phenol−removal step depending on the treatment capacity of the granulation step is transferred to somewhere(for example,the concentration step)other than the granulation step.Owing to the above process,in case of the occurrence of some troubles in the granulation step during the production of bisphenol A,it becomes unnecessary to stop the operation of the apparatus other than the granulation unit and bisphenol A formed till the stop of the operation in the granulation unit can be effectively utilized without wasting.Moreover,the time required until the start of normal operation in the granulation unit can be shortened thereby.