PROCESS FOR PRODUCING AROMATIC-HYDROCARBON-CONTAINING PRECURSOR PRODUCT FOR FORMING AROMATIC HYDROCARBON FROM CRUDE BENZENE OF COKING PLANT

摘要

PROBLEM TO BE SOLVED: To obtain a process for producing a precursor product whereby an arom. hydrocarbon of less than 9C is produced in a high yield, the yield of a high-boiling fraction obtd. at a distillation step is lowered, and the time between process interruptions required for removing polymer deposits is extended. ;SOLUTION: Arom. hydrocarbons of less than 9C other than styrene are prevented from coming into the bottom of a distillation column by the following operations; the flow rate of a coking treatment residue being taken out is adjusted to 6-40% of the flow rate of a coking plant crude benzene according to the content of polymer-formable compds. contained in the crude benzene; a low-boiling fraction of the coking treatment residue is taken out at a distillation step 4, condensed, and returned to the top of the flash tower 2; and both the temp. and pressure at the distllation step 4 are controlled.;COPYRIGHT: (C)1996,JPO