Absorptive separation of HCl and H.sub.2 S from catalytic reformer offgas
AssigneeChevron Research Company
InventorCharles S. McCoy
Life of this patent
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Abstract
A two stage low temperature adsorptive separation process for removing HCl and H.sub.2 S from a catalytic reforming offgas to make the offgas useful as a feed to a steam reforming process. In the first stage the offgas is passed through a molecular sieve bed that adsorbs HCl selectively. In the second bed the HCl depleted offgas is passed through a zinc oxide bed to remove the H.sub.2 S. The H.sub.2 S and HCl content of the offgas are reduced to levels that do not significantly poison the catalysts used in the steam reforming process.
Claims6
A substantially continuous adsorptive separation process for removing HCl and H.sub.2 S from a catalytic reforming offgas that contains less than about 10 ppm each of HCl and H.sub.2 S to make the offgas useful as a feedgas for a steam reforming process comprising:
- (a) passing the offgas at a temperature in the range of about 40.degree. C. to 70.degree. C. through a molecular sieve or activated alumina bed that adsorbs HCl selectively from the offgas, and
- (b) thereafter passing the HCl-depleted offgas at said temperature through a zinc oxide bed that adsorbs H.sub.2 S from the offgas, whereby HCl and H.sub.2 S are removed from the offgas to an extent that the HCl and H.sub.2 S contents of the offgas leaving the beds are below that which would significantly poison a steam reforming catalyst.
A substantially continuous adsorptive separation process for removing HCl and H.sub.2 S from a catalytic reforming offgas that contains less than about 10 ppm each of HCl and H.sub.2 S to make the offgas useful as a feedgas for a steam reforming process comprising:
- (a) passing the offgas at a temperature in the range of about 40.degree. C. to 70.degree. C. through an activated alumina bed that adsorbs HCl selectively from the offgas, and
- (b) thereafter passing the HCl-depleted offgas at said temperature through a zinc oxide bed that adsorbs H.sub.2 S from the offgas, whereby HCl and H.sub.2 S are removed from the offgas to an extent that the HCl and H.sub.2 S contents of the offgas leaving the beds are below that which would significantly poison a steam reforming catalyst.
Dependencies are inferred from the claim text.