Method for separating diisopropylbenzene (DIPB) and triisopropylbenzene (TIPB) of a feed comprising DIPB, TIPB and heavy hydrocarbons polyalkylated

摘要

A process for separating diisopropylbenzene (DIPB) and triisopropylbenzene (TIPB) of a feed comprising DIPB, TIPB and polyalkylated heavy hydrocarbons, the method comprising: introducing the feed into a distillation column operating at a pressure at the top of the column less than 35 kPa (5 psia), a pressure of the tail of the lower column 21 kPa (3 psi) above the pressure of the top of the column and a bottom temperature ranging from 224 ° to 241 ° C (435 ° to 465 ° F) and removing a sidestream comprising at least 99.8 wt% of the DIPB and at least 50% by weight of TIPB present in the feed stream and the tail comprising at least 95% by weight of the heavy hydrocarbons in the feed; wherein the side draw is removed from the column in a side offtake point, the DIPB, TIPB and heavy hydrocarbons in the column is introduced into a feed point, the column having a number of stages X theoretical wherein X is an integer that is greater than 40 and an upper stage is numbered 1 and a lower stage is numbered X, the side offtake point being disposed in an integrally X 0.26 X 0.40 numbered upper stage stage and the feed point being disposed in an integrally X 0,31 X 0,62 numbered upper stage stage.