Patent name: METHOD FOR JOINT PHENOL, ACETONE AND ALPHA-METHYLSTYRENE PRODUCTION
Patent Number: Patent No. 1563181
Priority: July 26, 1988
January 08, 1990
This invention refers to the alkaline organic synthesis, in particular, the method for jointly producing phenol, acetone and α-methylstyrene, which are used industrially as monomers, intermediate products etc. The purpose is to stabilize the yield of the desired products, simplify the technology and improve the process safety. The process comprises cleavage of technical cumene hydroperoxide in the presence of sulfuric acid at a temperature of 40-70°C in the circulation loop which consists of three reactors with the conversion degree of the initial product in the reactors: 50-60% in the first one, 30-37% in the second one and 20-30% in the third one. The cleavage mass is then kept at 85-105 °C and 0.3-5 excess pressure in the plug-flow reactor with addition of acetone in an amount determined by the dependence y = 18.76 - 0.27X and with acetone addition to the first reactor of the circulation loop in an amount determined by the dependence y = 36.61 - 0.832X, where X is the cumene hydroperoxide feed-rate to cleavage stage, t/hr; y is the wt% acetone per CHP fed to cleavage stage. This method allows simplification of the process by using acetone (which is the reaction product) instead of an NH3 solution as well as improvement of safety conditions of process conduction by eliminating possible overneutralization of H2SO4 in case of NH3 overdosing.