Patent ID: 6231753
Filing Date: 2001-05-15
Classification: B01J,C10G

Abstract:
A two-stage, vapor phase naphtha hydrodesulfurization process comprising (i) passing a sulfur and olefin-containing naphtha feed and hydrogen into a first vapor reaction stage in which said feed reacts with said hydrogen, in the presence of a bydrodesulfurization catalyst, to remove most of said sulfur from said feed to produce an effluent comprising a mixture of reduced sulfur naphtha and H.sub.2 S, (ii) separating said reduced sufur naphtha and H.sub.2 S, (iii) passing hydrogen and said reduced sulfur naphtha into a second vapor reaction stage, in which the reaction temperature and percent desulfurization are greater than that in said first stage, wherein said sulfur reduced naphtha reacts with said hydrogen, in the presence of a hydrodesulfurization catalyst, to remove most of the remaining sulfur in said naphtha to form an effluent comprising a mixture of H.sub.2 S and a desulfurized naphtha product which contains H.sub.2 S, (iv) removing said H.sub.2 S from said second stage liquid naphtha to form a desulfurized naphtha product liquid having at least about 40 vol. % of the olefin in the feed, and (v) removing said H.sub.2 S from said desulfurized naphtha product liquid.