Patent ID: 8828218
Filing Date: 2014-09-09
Classification: C10G

Abstract:
1. A process for selectively pretreating and desulfurizing a catalytically cracked naphtha feedstream, comprising: contacting, in a pretreater reactor, the naphtha feedstream and a first hydrogen-containing treat gas with a pretreater catalyst comprising an alumina-containing support and at least one Column 6 metal and at least one Column 8, 9 or 10 metal, wherein the gum content of the naphtha feedstream is at least 5 mg/100 ml, and the conditions within the pretreater reactor are about 100 to 1000 psig and about 300 to 400° F., and the first hydrogen-containing treat gas rate is about 300 to 1000 SCF/B; retrieving a pretreater product stream from the pretreater reactor wherein the pretreater product stream has a gum content of less than 20% of the gum content of the naphtha feedstream; heating the pretreater product stream; contacting, in a first naphtha hydrodesulfurization reactor, the heated pretreater product stream and a second hydrogen-containing treat gas with a first naphtha hydrodesulfurization catalyst comprising at least one Column 6 metal and at least one Column 8, 9 or 10 metal, wherein the conditions within the first naphtha hydrodesulfurization reactor are about 100 to 1000 psig and about 400 to 750° F., and the second hydrogen-containing treat gas rate is about 1000 to 4000 SCF/B; and retrieving a first naphtha hydrodesulfurization product stream from the first naphtha hydrodesulfurization reactor; wherein the: first naphtha hydrodesulfurization product stream has a lower sulfur content than the naphtha feedstream.