Sulphuric acid production bps A process

sulfate is a traditional production method for bpa AThe method uses 73-74% sulfuric acid as a catalyst, according to phenol: acetone: acid molecular ratio of 2:1:6 of the ingredients ratio, first phenol, sulfuric acid into the reaction box, added toluene reaction medium, stirring to make the temperature drop below 30 degrees C, and then add the appropriate amount of catalyst, usually for acetic acid, the main purpose of which is to shorten the reaction cycle, reduce the use of sulfuric acid, improve product quality and conversion rate, to reduce production costsThen began to drip acetone, reaction temperature control at 35-40 degrees C, reaction time of 4-6 hours, filter removal acid, filter cake washed, sodium carbonate and centrifugation separated finished product, the yield is 82-85%Sulphuric acid method is characterized by less equipment, simple process, but when synthetic bpa A has many by-products generated, for example, will generate adjacent bpras, adjacent bps, triphenols, color conceals and some other shrinks, so the law is poor product quality, high material consumption quota, labor intensity, and three waste, treatment is particularly difficultBpa A is mainly used for epoxy resins and polycarbonate, they have high purity requirements, epoxy resin bply sound a bply glycosin requires a purity of more than 95%, and polycarbonate with bisphenol A requires a purity of more than 99.5%, they have strict limits on color and impuritiesBisphenol A products produced by sulphuric acid must also be refined for application in bothBisphenol A products commonly used refined purification methods have recrystallization method, compound purification method and solvent extraction methodSulphuric acid method is still the main production method of BPA in China, but it has been phased out in developed countries as early as the 1960s