Process using iron-thallium catalysts in CO hydrogenation
AssigneeExxon Research & Engineering Co.
InventorsFranklin J. Wright, Michael A. Richard, James C. Pirkle
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Abstract
CO hydrogenation process is described utilizing novel thallium-promoted iron catalysts. Mixtures of CO/H.sub.2 are selectively converted to liquid C.sub.6 -C.sub.11 hydrocarbons containing C.sub.6 -C.sub.11 aromatics, alpha olefins and very small amounts of C.sub.23 + hydrocarbon waxes.
Claims22
A process for producing liquid hydrocarbons, including those in the C.sub.6 -C.sub.11 hydrocarbon range, comprising the steps of:
- (a) first depositing thallium on the surface of a supported or unsupported iron catalyst wherein the weight ratio of iron-thallium, taken as the free metals, is from about 100:1 to 1:100, and wherein said iron compounds contain iron value substantially in the trivalent state;
- (b) contacting said iron-thallium catalyst with a mixture of CO and H.sub.2 in a volume ratio of about 1:4 to 4:1, respectively, at a temperature ranging from 270.degree. to 550.degree. C., a pressure ranging from 0.1, to 10 MPa and a space velocity ranging from 10 to 10,000 v/v/hr., or equivalent conditions, for a sufficient time to substantially convert said thallium compounds to metallic thallium and said iron compounds to reduced and carbided iron;
- and
- (c) continuing said contacting as described in step (b) at a pressure above 0.1 MPa, a temperature ranging from 230.degree. to 550.degree. C., to produce liquid hydrocarbons comprising about 40 weight percent and greater C.sub.6 -C.sub.11 liquid hydrocarbons and below about 5 weight percent C.sub.23+ hydrocarbons.
A process for producing liquid hydrocarbons, including those in the C.sub.6 -C.sub.11 hydrocarbon range, comprising the steps of:
- (a) first depositing thallium nitrate or oxide on the surface of a supported iron catalyst to form an iron-thallium catalyst the weight ratio or iron:thallium, taken as the free metals in the composition, being from about 100:1 to 65:35, said support being aluminum oxide, magnesium oxide or mixtures thereof;
- (b) contacting said iron thallium catalyst with a mixture of CO and H.sub.2 at a volume ratio of 1:1 at about 270.degree. C., at 0.1 MPa pressure, a space velocity of 300 to 500 v/v/hr, for a sufficient time to substantially convert said thallium compound to metallic thallium and said iron oxide to reduced and carbided iron;
- and
- (c) continuing said contacting as described in step (b) at a temperature ranging from 270.degree. to 350.degree. C. a pressure ranging from 0.5 to 1.5 MPa, and a space velocity ranging from 150 to 1500 v/v/hr, to produce hydrocarbons comprising C.sub.6 -C.sub.11 liquid hydrocarbons comprised of about 20 weight percent alpha olefin hydrocarbons and less than about one weight percent C.sub.23+ hydrocarbon waxes.
A process for producing liquid hydrocarbons, including those in the C.sub.6 -C.sub.11 hydrocarbon range, comprising the steps of:
- (a) first depositing thallium nitrate or oxide on the surface of a supported iron oxide catalyst to form an iron thallium catalyst, the weight ratio of iron:thallium, taken as the free metals in the composition, being from about 100:1 to 65:35, said support being aluminum oxide, magnesium oxide, or mixtures thereof;
- (b) contacting said iron thallium catalyst with a mixture of CO and H.sub.2 at a volume ratio of about 1:1 at about 270.degree. C., at 0.1 MPa pressure, a space velocity of 300 to 500 v/v/hr, for a sufficient time to substantially convert said thallium compounds to metallic thallium and said iron oxide to reduced and carbided iron;
- and
- (c) continuing said contacting described in step (b) at a temperature ranging from 350.degree. to 550.degree. C., a pressure ranging from 0.5 to 1.5 MPa, and a space velocity ranging from 150 to 1500 v/v/hr, to produce hydrocarbons comprising C.sub.6 -C.sub.11 liquid hydrocarbons comprised of at least about 25 weight percent C.sub.6 -C.sub.11 aromatic hydrocarbons and less than about one weight percent C.sub.23+ hydrocarbon waxes.
Dependencies are inferred from the claim text.