The diisopropylbenzene (DIPB), toriisopuropirubenzen (TIPB) and manner in order to separate DIPB and TIPB from the feed which includes poly alkylate heavy ones

摘要

Processes and apparatuses for separating diisopropylbenzene (DIPB) and triisopropylbenzene (TIPB) from a feed (21) comprising DIPB, TIBP and polyalkylate heavies are disclosed. The disclosed processes include introducing the feed (21) into a distillation column (22) having a column top (24) pressure of less than 35 kPa (5 psia), a column bottoms (25) pressure of less than 21 kPa (3 psi), and preferably 14 kPa (2 psi) or less above the column top pressure with a bottoms temperature ranging from 224 to 241 C (435 to 465F). The processes also include taking OFF a side draw (28) comprising at least 99.8 wt% of the DIPB and at least 50 wt% of the TIPB present in the feed (21) and a bottoms stream (41) comprising at least 95 wt% of the heavies contained in the distillation feed (21). The low temperature bottoms temperature enables high pressure steam to be used as the bottoms reboiler (38) HEAT source.