Increase the value of steam-cracker C4 cuts via low-temperature selective hydrogenation and hydroisomerization catalysis. Several…
Upgrading Steam Cracker C3 Cuts Process by Axens
To purify propylene-propane cuts from pyrolysis processes via selective catalytic hydrogenation of methylacetylene and propadiene (MAPD) impurities. Steam cracker C3 effluents typically contain over 90% propylene, with propane and MAPD making up the balance. Although distillation can be used to remove MAPD, it is often not practical or economical for achieving a propylene product meeting the parts-per-million levels required by chemical- and polymer-grade propylene specifications. Furthermore, distillation results in propylene losses. Selective hydrogenation is the route most commonly applied as it not only achieves the tight MAPD specifications, but it also produces more propylene.
The C3 cut is joined by recycled C3s and makeup hydrogen prior to entering the main reactor (1). There the MAPD is catalytically hydrogenated, forming propylene and traces of propane. A single reactor suffices for polymer-grade propylene (MAPD content
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