Bisphenol A synthesis process and enterprises at home and abroad

Bisphenol A 22-II (4-hydroxyl) propane, is an important organic chemical raw material, phenol and acetone important derivatives, mainly used in the production of polycarbonate, epoxy resin, polyurethane resin, polyphenyl ether resin, unsaturated polyester resin and other polymer materialsIt can also be used in the production of plasticizers, flame retardants, antioxidants, thermal stabilizers, rubber anti-aging agents, pesticides, coatings and other fine chemical productssynthesis process Bisphenol A is made up of two molecules of phenol and a molecular acetone, the reaction catalyst is acidic catalyst, industrial applications of catalysts are sulfuric acid, hydrogen chloride and ion exchange resinThe industrial application of these different types of catalysts constitutes different stages in the development of BPA technology1The traditional bisphenol A production method of sulphuric acid is used as a catalyst, and phenol is condensed with acetoneHowever, sulfuric acid method selectivity is poor, the resulting impurities have more than 40 kinds, and it is difficult to separate, BPA quality is poor, sulfuric acid consumption is large, the formation of a large number of waste acids and acids, phenolic wastewater, serious environmental pollution, the world's industrial developed countries have long eliminated the sulfuric acid method process2Hydrogen chloride method in the United States was the first to use hydrogen chloride as a catalyst to produce bpa A, compared with sulfuric acid method, the catalyst hydrogen chloride volatile, can use vacuum distillation method to remove from the reaction system, the production of BPA quality is betterHowever, hydrogen chloride is highly corrosive, the material selection requirements for equipment and pipelines are high, investment increases, and the hydrogen chloride method is gradually phased out3In order to overcome the disadvantages of the above two methods, the ion exchange resin method began in the early 1970s to conduct research on ion exchange resin as a catalyst for the synthesis of bpsIndustrialization has been achieved, the process has greatly changed the shortcomings of the traditional process, the reaction material is very easy to separate, the post-treatment is simple, the ion exchange resin is weak corrosion on the equipment, the reliability of the system operation is greatly improved, and the investment cost has not increasedThe shrinking reaction is carried out at a large phenolic ratio, which is both a reacting substance and a reaction solvent, which improves the selectivity of the shrink reaction, and the impurities in the condensing reaction product can obtain high-quality BPA products through a simple refining processTherefore, the production of bisphenol A technology has become the mainstream and development direction of BPA productionthe world has its own BPA technology manufacturers have GE, BAYER, DOW Chemistry, Chiyoda, BLACHOUNIA and other companiesThese manufacturers have many years of BPA development and production experience, including GE, BAYER, DOW, Chiyoda technology represents the world's advanced level of BPA synthesis technology