Sulfide removal process

Claim 2

A process for reducing the sulfide concentration of a reducing gas feed mixture wherein the sulfide is hydrogen sulfide, carbonyl sulfide, or a mixture thereof, which comprises contacting the feed at a temperature above about 300°F. with a sorbent comprised of a metal-containing component, said metal being selected from the group consisting of lanthanum, rare earths, mixtures of rare earths, and mixtures of lanthanum with at least one rare earth, the sulfide concentration being reduced by sorption of the sulfide by the sorbent.

Claim 3

The process of claim 1 wherein the sorbent is supported on a porous inorganic support.

Claim 4

The process of claim 1 wherein the sorbent additionally contains a promoter selected from the group consisting of an alkali metal component, alkaline earth metal component and mixtures thereof.

Claim 5

The process of claim 1 wherein the sulfide component is desorbed from the sorbent by contacting the sulfide loaded sorbent with steam.

Claim 6

The process of claim 4 wherein the desorbed sorbent is substantially regenerated by contacting the desorbed sorbent with an oxidizing gas for a period sufficient to regenerate substantially the sorbent.

Claim 7

A process for removing sulfides selected from the group consisting of hydrogen sulfide, carbonyl sulfide, and mixtures thereof from a reducing gas feedstream which comprises contacting the feedstream, at temperatures in excess of about 500°F., with a regenerable sorbent comprised of a metal containing component, said metal being selected from the group consisting of metals having an atomic number ranging from 57 to 71 and mixtures thereof, said metal containing component being supported on a porous inorganic support, the sulfide being removed by sorption by the sorbent.

Claim 8

A process for removing sulfides selected from the group consisting of hydrogen sulfide, carbonyl sulfide, and mixtures thereof from a reducing gas feedstream which comprises contacting the feedstream, at temperatures in excess of about 500°F., with a regenerable sorbent comprised of a metal containing component, said metal being selected from the group consisting of metals having an atomic number ranging from 57 to 71 and mixtures thereof, said metal containing component being supported on a porous inorganic support, the sulfide being removed by sorption by the sorbent.

Claim 9

The process of claim 6 wherein the contacting of the feedstream and the sorbent is effected at a temperature ranging from about 500°-1700°F.

Claim 10

The process of claim 7 wherein the feedstream is derived from gasification of fluid coke.

Claim 11

The process of claim 8 wherein the feedstream contains hydrogen sulfide and carbonyl sulfide.

Claim 12

The process of claim 6 wherein the sulfide is desorbed from the sorbent by contacting the sulfide loaded sorbent with steam.

Claim 13

The process of claim 10 wherein the desorption is effected at a temperature ranging from about 500°-1700°F.

Claim 14

The process of claim 10 wherein the desorbed sorbent is substantially regenerated by contacting the desorbed sorbent with an oxidizing gas for a period sufficient to regenerate substantially the sorbent.

Claim 15

The process of claim 12 wherein the regeneration is effected at a temperature ranging from about 500°-1700°F.

Claim 16

The process of claim 12 wherein the oxidizing gas is air.

Claim 17

The process of claim 6 wherein the sorbent additionally contains a promoter selected from the group consisting of an alkali metal component, alkaline earth metal component and mixtures thereof.

Claim 18

The process of claim 15 wherein the promoter is a potassium component.

Claim 19

A cyclic process for removing hydrogen sulfide, carbonyl sulfide or mixtures thereof, from a reducing gas feedstream which comprises a. contacting the feedstream at a temperature of about 500° to 1700°F with a regenerable sorbent comprised of a metal containing component, said metal being selected from the group consisting of metals having an atomic number ranging from 57 to 71 and mixtures thereof and supported on a porous inorganic support; b. interrupting the flow of the feedstream at a predetermined time; c. contacting the sorbent with steam at a temperature of about 500° to 1700°F thereby desorbing hydrogen sulfide; d. contacting the desorbed sorbent with an oxidizing gas at a temperature of about 500° to 1700°F, for a period sufficient to regenerate substantially the sorbent; and, e. contacting the regenerated sorbent with the feedstream at the conditions of step (a).

Claim 20

A cyclic process for removing hydrogen sulfide, carbonyl sulfide or mixtures thereof, from a reducing gas feedstream which comprises a. contacting the feedstream at a temperature of about 500° to 1700°F with a regenerable sorbent comprised of a metal containing component, said metal being selected from the group consisting of metals having an atomic number ranging from 57 to 71 and mixtures thereof and supported on a porous inorganic support; b. interrupting the flow of the feedstream at a predetermined time; c. contacting the sorbent with steam at a temperature of about 500° to 1700°F thereby desorbing hydrogen sulfide; d. contacting the desorbed sorbent with an oxidizing gas at a temperature of about 500° to 1700°F, for a period sufficient to regenerate substantially the sorbent; and, e. contacting the regenerated sorbent with the feedstream at the conditions of step (a).

Claim 21

The process of claim 17 wherein the time for steps (c) and (d) is equal to or less than the time for step (a).

Claim 22

The process of claim 17 wherein steps (a), (c) and (d) are conducted at the same temperature.

Claim 23

The process of claim 19 wherein the temperature ranges from about 600° to 1100°F.

Claim 24

The process of claim 17 wherein the sorbent is comprised of lanthanum.

Claim 25

The process of claim 17 wherein the sorbent is comprised of didymium.

Claim 26

The process of claim 17 wherein the sorbent additionally contains a promoter selected from the group consisting of a potassium component, a sodium component, and mixtures thereof.

Claim 27

The process of claim 23 wherein the promoter is potassium oxide.

Claim 28

The process of claim 24 wherein the promoter is present in an amount ranging from about 0.1 to about 10 atoms per atom of sorbent metal.

Claim 29

A cyclic process for removing sulfides selected from the group consisting of hydrogen sulfide, carbonyl sulfide or mixtures thereof from a reducing gas feedstream which comprises periodically contacting the feedstream with a sorbent at temperatures in the range of about 500°-1700°F. which sorbent is comprised of a metal component, the metal being selected from the group consisting of lanthanum, didymium, and mixtures thereof, thereby sorbing the sulfide and thereafter desorbing and regenerating the sorbent, and recovering the sulfide as hydrogen sulfide.

Claim 30

A cyclic process for removing sulfides selected from the group consisting of hydrogen sulfide, carbonyl sulfide or mixtures thereof from a reducing gas feedstream which comprises periodically contacting the feedstream with a sorbent at temperatures in the range of about 500°-1700°F. which sorbent is comprised of a metal component, the metal being selected from the group consisting of lanthanum, didymium, and mixtures thereof, thereby sorbing the sulfide and thereafter desorbing and regenerating the sorbent, and recovering the sulfide as hydrogen sulfide.

Claim 31

The process of claim 2 wherein the metal-containing component is comprised of lanthanum oxide.

Claim 32

The process of claim 7 wherein the metal-containing component is comprised of lanthanum oxide.

Claim 33

The process of claim 27 wherein the metal-containing component is comprised of lanthanum oxide.

Claim 34

The process of claim 29 wherein the lanthanum oxide is supported on an alumina support.

Claim 35

The process of claim 2 wherein the sorbent additionally contains a promoter selected from the group consisting of a potassium component, a sodium component, and mixtures thereof.

Claim 36

The process of claim 31 wherein the promoter is potassium oxide.

Claim 37

The process of claim 32 wherein the temperature ranges from about 600° to 1100°F.

Claim 38

The process of claim 31 wherein the sulfide is desorbed from the sorbent by contacting the sulfide loaded sorbent with steam.

Claim 39

The process of claim 34 wherein the desorbed sorbent is substantially regenerated by contacting the desorbed sorbent with an oxidizing gas for a period sufficient to regenerate substantially the sorbent.