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REGENERATION OF ALKALI METAL REAGENT

  • US 20110147274A1
  • Filed: 12/14/2010
  • Published: 06/23/2011
  • Est. Priority Date: 12/18/2009
  • Status: Active Grant
First Claim
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1. A method for regenerating an alkali metal salt reagent, comprising:

  • a) receiving a hydrocarbon feedstream having an API gravity of at least about 20, the hydrocarbon feedstream including at least about 7.5 wt % of alkali metal salt particles, the alkali metal salt particles comprising alkali metal hydrogen sulfide particles;

    b) washing the hydrocarbon feedstream with water to form a hydrocarbon product stream and an aqueous alkali metal salt stream containing alkali metal salt;

    c) treating at least a portion of the aqueous alkali metal salt stream with carbon dioxide under effective conditions to form an aqueous alkali carbonate stream;

    d) mixing the aqueous alkali carbonate stream with regenerated calcium oxide under effective conditions to form an aqueous alkali metal hydroxide and calcium carbonate solids;

    e) separating the calcium carbonate from the aqueous alkali metal hydroxide; and

    f) heating the calcium carbonate under effective conditions to form regenerated calcium oxide, wherein at least a portion of the regenerated calcium oxide is used for said mixing with aqueous alkali carbonate.

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