| 摘要 |
A process for the selective hydrogenation of alpha-methyl-styrene (AMS) to cumene in a two catalyst system is disclosed. A crude cumene feed stream containing up to 10% AMS by weight is supplied to the first reaction zone 112 and mixed with hydrogen in a first catalyst bed 118 containing a nickel catalyst, converting from 70 to 95 percent of the AMS to cumene. Cumene and remaining AMS are separated from hydrogen in a liquid take off tray 120 . The first reaction zone 112 5effluent is supplied to a second reaction zone 114 , where the effluent and hydrogen gas are mixed in a second catalyst bed 126 containing a noble-metal catalyst to substantially convert any remaining AMS to cumene. Cumene is collected, separated from the hydrogen, and can be resupplied to the hydrogenation reactor 110 , or supplied as feed to a phenol synthesis loop. |
