A Novel Resilient Process Design of Propylene Hydrogenation Purification by Catalytic Distillation

摘要

A novel catalytic distillation process to convert methyl acetylene and propadiene (MAPD) intornpropylene with a high selectivity is proposed in a propylene catalytic distillation column. In thernimproved process, MAPD are separated from propylene, enriched at the bottom of the stripping sectionrnof the propylene fractionation column and hydrogenated into propylene simultaneously. Compared tornconventional hydrogenation process followed by distillation unit, the propylene content in thernhydrogenation section is decreased from 90% to as low as 2%, therefore the side reaction is significantlyrnprevented. By Aspen Plus simulation, the propylene yield increases by 2.1%~4.5% with a hydrogenationrnselectivity increasing significantly from 40%~60% to 99%. The integrated process utilizes the reactionrnheat as part of the reboiler heat source, resulting in an energy saved by 2.5%~5.6%. Besides, the novelrnprocess shows a high hydrogenation capacity and a high anti-deactivation ability to extend the catalystrnregeneration cycle by 3~4 times. It makes that the new process is especially suitable to deal with the C3rnfraction from heavy cracking feedstock or shorter residence time cracking furnace.