Patent ID: 7867378
Filing Date: 2011-01-11
Classification: B01J,C07C,C10G,Y02P

Abstract:
1. A process for converting a feedstock of ethanol and hydrocarbons in a fluidized catalytic cracking unit with increased yields of ethene, comprising the following steps: a) introducing ethanol, corresponding to a proportion of 0.15 to 50 wt % of the total feedstock, in a first reaction zone of an FCC reactor, by contacting a zeolite catalyst for dehydration reaction; b) introducing hydrocarbons in a second reaction zone of the same FCC reactor by contacting the catalyst dispersed in a reaction medium that leaves the first reaction zone for cracking into hydrocarbon products; c) separating the hydrocarbon products and a deactivated catalyst at the outlet of the reactor; d) rectifying the deactivated catalyst to remove hydrocarbon products which are then mixed with the hydrocarbon products from step c) to obtain streams of hydrocarbon products which are recovered with increased yields of ethene; and e) regenerating the catalyst which emerges from the rectifing step to recycle as a stream of regenerated catalyst at a high temperature to the reactor, wherein the first reaction zone corresponds to the following conditions in the reactor: contact time in the range of from 0.05 to 1.0 second, space velocity in the range of from 1000 to 4000 h wherein the second reaction zone corresponds to the following conditions in the reactor: temperature in the range of from 500° C. to 620° C., contact time in the range of from 1.5 to 3.0 seconds, space velocity in the range of from 200 to 400 h