DESULFURIZATION OF HEAVY HYDROCARBONS AND CONVERSION OF RESULTING HYDROSULFIDES UTILIZING COPPER SULFIDE

  • US 20100084318A1
  • Filed: 09/29/2009
  • Published: 04/08/2010
  • Est. Priority Date: 10/02/2008
  • Status: Active Grant
First Claim
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1. A process for desulfurizing a sulfur-containing hydrocarbon stream, comprising:

  • a) contacting a sulfur-containing hydrocarbon stream with an API gravity less than about 40 with an alkali metal hydroxide in a first reaction zone, thereby producing a desulfurized hydrocarbon/spent alkali metal reagent stream;

    b) conducting the desulfurized hydrocarbon/spent alkali metal reagent stream to a first separation zone, wherein at least a portion of the desulfurized hydrocarbons are separated from the spent alkali metal reagents, thereby producing a desulfurized hydrocarbon product stream;

    c) conducting at least a portion in of the spent alkali metal reagents to a second reaction zone, wherein the spent alkali metal reagents are contacted with a copper sulfide reagent, and wherein the spent alkali metal reagents are comprised of alkali metal hydrosulfides, and at least a portion of the alkali metal hydrosulfides are converted to regenerated alkali metal hydroxides and at least a portion of the copper sulfide reagent is converted to copper sulfide reaction products, thereby producing a desulfurized alkali metal stream comprised of regenerated alkali metal hydroxides and copper sulfide reaction products;

    d) conducting at least a portion of the desulfurized alkali metal stream to a second separation zone, wherein at least a portion of the copper sulfide reaction products are separated from the regenerated alkali metal hydroxides;

    e) conducting at least a portion of the regenerated alkali metal hydroxides to the first reaction zone as a regenerated alkali metal hydroxide stream;

    f) conducting at least a portion of the copper sulfide reaction products to a first regeneration zone, wherein the copper sulfide reaction products are heated under a non-oxidizing atmosphere to a temperature from about 700 to about 2000°

    F., thereby converting at least a portion of the copper sulfide reaction products to regenerated copper sulfide reagents; and

    g) conducting at least a portion of the regenerated copper sulfide reagents to the second reaction zone.

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