Patent name: WASTELESS ECONOMIC METHOD OF PRODUCTION OF PHENOL AND ACETONE
Patent Number: US 6,252,124
June 26, 2001
A new phenol and acetone production process reduces the amount of necessary stages for obtaining phenol and acetone, results in higher yield of desired products and requires less complex equipment implementation and less energy than current processes of a similar type. The new process comprises a stage of cumene hydroperoxide production via cumene oxidation, a stage of cumene oxidation products concentration to produce technical cumene hydroperoxide and recycle of unreacted cumene to oxidation stage after treatment, a stage of separation of cumene oxidation products in a continuous or cycle adsorption-desorption with the purpose of producing CHP that is free from DMBA and AP utilizing predetermined adsorbents and desorbents, a stage of heterogeneous or homogeneous cumene hydroperoxide cleavage with the use of acidic catalysts to produce at least phenol and acetone, a stage of AP fractionation from AP-cumene fraction and return of cumene to the separation stage, a stage of catalytic DMBA hydrogenation into cumene, and a stage of separating phenol, acetone, and desorbent to produce required product phenol and acetone. This results in (1) elimination of formation of by-products at the CHP cleavage stage and the fractionation stage; (2) simplification and reduced complexity of CHP cleavage products fractionation; and (3) a significant decrease in energy expenses compared to the conventional phenol and acetone production processes.