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Ama-assorbents ochungechungeni lwe-USY zeolite adlala indima ebalulekile ekucwengiseni uwoyela nasemikhakheni ye-petrochemical. Inqubo yokucwenga kawoyela inqubo yokukhiqiza uphethiloli, i-perosene, uwoyela kadizili, Uwoyela wokuthambisa neminye imikhiqizo ngenqubo yokuhlukana nokuguqulwa kwenhlanganisela, kufaka phakathi umkhathi kanye ne-vacuum, Ukuqhekeka kwe-catalytic, i-hydrocracking namanye amadivayisi.