Patent ID: 9321705
Filing Date: 2016-04-26
CPC Classification: C07C

Claim Text:
1. A process of producing isopropyl benzene, comprising steps of: a) feeding a stream containing polyisopropyl benzene into a polyisopropyl benzene column, resulting in a stream of relatively lighter components at the top of the column, a stream of relatively heavier components at the middle of the column and a stream of heavy components containing tar at the bottom of the column through a separation by rectification, in which the stream of heavy components containing the tar is fed into subsequent procedures; wherein the stream of relatively lighter components contains at least greater than 95 wt % of diisopropylbenzene and the stream of relatively heavier components contains at least greater than 0.5 wt % of triisopropyl benzene; and b1) feeding a first benzene stream and the stream of relatively lighter components into a first transalkylation zone, contacting with a catalyst for transalkylation, and providing a first isopropyl benzene-containing stream at the bottom of the first transalkylation zone; feeding a second benzene stream and the stream of relatively heavier components into a second transalkylation zone, contacting with a catalyst for transalkylation, and providing a second isopropyl benzene-containing stream at the bottom of the second transalkylation zone; and feeding the first isopropyl benzene-containing stream and the second isopropyl benzene-containing stream into subsequent refining procedures, to provide a product isopropyl benzene; or b2) feeding a first benzene stream and the stream of relatively lighter components into a first transalkylation zone, contacting with a catalyst for transalkylation, and providing a first isopropyl benzene-containing stream at the bottom of the first transalkylation zone; feeding the first isopropyl benzene-containing stream and the stream of relatively heavier components into a second transalkylation zone, contacting with a catalyst for transalkylation, and providing a second isopropyl benzene-containing stream at the bottom of the second transalkylation zone; and feeding the second isopropyl benzene-containing stream into subsequent refining procedures, to provide a product isopropyl benzene.