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US 6,743,405 B1Granted
Low temperature sorbents for removal of sulfur compounds from fluid feed streams
AssigneeThe United States of America as represented by the United States Department of Energy
InventorRanjani Siriwardane
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Abstract
A sorbent material is provided comprising a material reactive with sulfur, a binder unreactive with sulfur and an inert material, wherein the sorbent absorbs the sulfur at temperatures between 30 and 200° C. Sulfur absorption capacity as high as 22 weight percent has been observed with these materials.
Claims9
A material for removing hydrogen sulfide from a gas stream, the material comprising:
- a) a compound reactive with hydrogen sulfide at between 30° and 200° C., the reactive material selected from the group consisting of iron (III) hydroxide, potassium bicarbonate, rubidium hydroxide, zinc oxide hydrate, lithium hydroxide, sodium peroxide, and combinations thereof, said reactive material calcined at temperatures below 150° C. and reactive with hydrogen sulfide at between 30° and 200° C.;
- b) the reactive compound having a weight percent range of 30-70%;
- c) a first inert diluent selected from a group consisting of titanium oxide, calcium sulfate, calcium phosphate, calcium silicate, magnesium sulfate, zinc silicate, zinc aluminate, and alumino silicate and combinations thereof;
- d) a second inert diluent having a particle size at least twice that of the reactive compound selected from a group consisting of silica, silica gel, alumina, alumina gel, sand, and calcium sulfate and combinations thereof;
- e) the first and second diluents having a weight percent range of 10-30% of the material;
- f) a binder unreactive with hydrogen sulfide selected from a group consisting of bentonite, kaolinite, cement, hydroxypropylmethyl cellulose, molasses, starch, polyvinyl acetate, cellulose, hydroxy cellulose, lignin sulfonate, and combinations thereof;
- and
- g) the binder having a weight percent range of 2-60%.
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A method for producing a sorbent capable of removing hydrogen sulfide from a gas stream at temperatures ranging from 30° C. to 200° C., the method comprising:
- a) combining a sulfur reactive compound selected from the group consisting of iron (III) hydroxide, potassium bicarbonate, rubidium hydroxide, zinc oxide hydrate, lithium hydroxide, sodium peroxide, and ferric oxide with a first and second inert material and a binder to create a homogenous mixture;
- b) pelletizing the mixture;
- and
- c) calcining the pelletized mixture at a temperature range between about 50° C. and 150° C.
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Dependencies are inferred from the claim text.