Patent name: METHOD FOR JOINT PHENOL, ACETONE AND ALPHA-METHYLSTYRENE PRODUCTION
Patent Number: Patent No. 2108318
Priority: March 01, 1994
April 10, 1998
This invention relates to area of oil chemistry synthesis, particularly to the method of phenol, acetone and alpha-methylstyrene production by cumene method. Cleavage process is carried out introducing acetone to a cumene hydroperoxide cleavage reactor by the following algorithm:
GAC = GCHP 0.125 [CHP] + (35/GCHP[CHP]),
where GCHP, GAC is the amount of technical CHP and acetone fed to cleavage, respectively, t/hr;
[CHP] is CHP concentration in technical CHP, wt.%.
Cumene hydroperoxide is cleaved in a mixing reactor at the same pressure (4 to 5 atm.) as dicumylperoxide is cleaved in a plug-flow reactor. Cumene hydroperoxide is cleaved under nearly isothermal conditions within a narrow temperature range of from 65 to 75°C. The concentration of uncleaved cumene hydroperoxide at the mixing reactor system outlet is determined by temperature differential T1 at the inlet and outlet of a specially installed mini-reactor (calorimeter). Water is added to the plug-flow reactor in the amount of 100-500 kg/hr which is determined by the temperature differential value T2 between the inlet and outlet of the calorimeter specially installed on circulation loop product line after cleavage product has mixed with water at product residence time in a calorimeter of 7 to 8 min. CHP cleavage process is controlled via relation between T1 and T2 values in such a way as to maintain T2 value at 0.2-3°C higher than T1 value. To eliminate undesired side reactions occurring while introduced acetone is distilled from reaction products, ammonia is added prior to acetone evaporator in a H2SO4 to NH3 ratio of from 1:1 to 1:2.