Hydrocarbon desulfurization process

Abstract

A process for the production of low sulfur hydrocarbonaceous products. The hydrocarbonaceous feedstock containing sulfur compounds is separated into a first hydrocarbonaceous stream containing the most refractory sulfur compounds and a second hydrocarbonaceous stream containing the least refractory sulfur compounds. The first stream desulfurized in a first desulfurization zone and the effluent along with the second hydrocarbonaceous stream is introduced into a second desulfurization zone.

1 - 15 . (canceled)  
   
   
       16 . A process to produce an ultra low sulfur diesel stream from a sulfur containing hydrocarbonaceous feedstock boiling in the range of diesel fuel wherein the process comprises the steps of: 
 (a) separating the feedstock into a first stream containing more refractory sulfur compounds and in an amount less than about 30 volume percent of the feedstock and a second stream containing less refractory sulfur compounds;    (b) introducing the first stream containing more refractory sulfur compounds and hydrogen into a first hydrodesulfurization zone containing desulfurization catalyst at operating conditions including a temperature from about 204° C. (400° F.) to about 482° C. (900° F.), a pressure from about 2.1 MPa (300 psig) to about 17.3 MPa (2500 psig) and a liquid hourly space velocity from about 0.1 hr −1  to about 10 hr −1  to produce a first hydrodesulfurization zone effluent stream;    (c) introducing at least a portion of the first hydrodesulfurization zone effluent stream, hydrogen and the second stream containing less refractory sulfur compounds into a second hydrodesulfurizalion zone containing hydrodesulfurization catalyst at operating conditions less severe than those in the first hydrodesulfurization zone and including a temperature from about 204° C. (400° F.) to about 482° C. (900° F.), a pressure from about 2.1 MPa (300 psig) to about 17.3 MPa (2500 psig) and a liquid hourly space velocity from about 0.1 hr −1  to about 10 hr −1  to produce a second hydrodesulfurization zone effluent; and    (d) separating the second hydrodesulfurization zone effluent to produce an ultra low sulfur diesel stream containing less than about 50 wppm sulfur.    
   
   
       17 . The process of  claim 16  wherein the ultra low sulfur diesel stream contains less than about 10 wppm sulfur.