Sorption of trialkyl arsines
AssigneePhillips Petroleum Company
InventorsGerhard P. Nowack, Tin-Tack P. Cheung
Life of this patent
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Abstract
Trialkyl arsine (in particular trimethyl arsine) is removed from a fluid (e.g., a hydrocarbon-containing gas) by contacting the fluid with a sorbent material comprising (a) elemental sulfur, and (b) an inorganic support material, preferably alumina and/or silica and/or titania and/or activated carbon.
Claims22
A process for at least partially removing trialkyl arsines from gases comprising the step of contacting a gaseous feed which contains at least one trialkyl arsine with a solid sorbent material comprising (a) elemental sulfur and (b) an inorganic support material;
- wherein said contacting is carried out at such contacting conditions as to obtain a product having a lower trialkyl arsine content than said feed;
- wherein the content of said at least one trialkyl arsine in said feed is such as to provide a level of about 1 ppb to about 0.1 weight-% As;
- and wherein said sorbent has been prepared by depositing at least one polysulfide of at least one transition metal selected from the group consisting of manganese, iron, cobalt, nickel and copper on said inorganic support material, and at least partially converting said at least one polysulfide to elemental sulfur by reaction with a free oxygen containing gas.
A process for at least partially removing trialkyl arsines from gases comprising the step of contacting a gaseous feed which contains at least one trialkyl arsine with a solid sorbent material consisting essentially of (a) elemental sulfur and (b) an inorganic support material;
- wherein said contacting is carried out at such contacting conditions as to obtain a product having a lower trialkyl arsine content than said feed, and the spent sorbent material contains that portion of said at least one trialkyl arsine which has been removed from said feed;
- and wherein the content of said at least one trialkyl arsine in said feed is such as to provide a level of about 1 ppb to about 0.1 weight-% As.
Dependencies are inferred from the claim text.