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US 7,744,749 B2Granted
Diesel oil desulfurization by oxidation and extraction
AssigneeSaudi Arabian Oil Company
InventorsGary M. Martinie, Farhan M. Al-Shahrani, Bashir O. Dabbousi
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Abstract
The reduction in the sulfur-containing content of diesel fuel is achieved by oxidation in the presence of a catalyst followed by a liquid-liquid countercurrent extraction.
Claims30
A process for reducing the sulfur content of diesel fuel comprising the steps of:
- a. contacting a diesel fuel containing sulfur compounds in a reactor with an oxidant selected from the group consisting of sulfuric acid, peracetic acid, hydrogen peroxide, sodium hypochlorite, perchloric acid, nitric acid, sodium or potassium peroxidisulfate or peroxymonosulfate, and mixtures thereof, in the presence of a homogeneous or heterogeneous oxidation catalyst selected from the group consisting of {(C8H17)4N}3PW4O24, Mo2W7O30.2N(CH2PO)3, MoO2NH(CHCH3CH2O)2, N(CH2PO)3(WO5)9, H5BiMo12O40.4H2O, and Na4C32H12N8S4O12Co(II)O2, at a temperature in the range of from about 50° C. to about 150° C. for a period of time sufficient to oxidize the sulfur compounds;
- and
- b. removing the oxidized sulfur compounds from the diesel fuel by liquid-liquid countercurrent extraction with a water-soluble polar solvent.
A process for reducing the sulfur content of diesel fuel containing sulfur compounds comprising:
- a. introducing an aqueous oxidant and a heterogeneous or homogenous catalyst selected from the group consisting of {(C8H17)4N}3PW4O24, Mo2W7O30.2N(CH2PO)3, .XH2O, MoO2NH(CHCH3CH2O)2, N(CH2PO)3(WO5)9, H5BiMo12O40.4H2O, and Na4C32H12N8S4O12Co(II)O2, into the top of a reactor column;
- b. contacting the oxidant and catalyst in countercurrent flow in the reactor with a diesel fuel boiling in the range of from about 240° C. to about 360° C.;
- c. continuously oxidizing the sulfur compounds in the diesel oil;
- d. continuously extracting oxidized compounds from the diesel oil produced in the reactor by contact with an aqueous solution of a polar solvent in a column;
- e. removing traces of aqueous solution from the diesel fuel in a stripper column;
- f. recovering the aqueous solution;
- and
- g. adsorbing remaining sulfur compounds from the diesel fuel with an absorbent selected from the group consisting of activated carbon, silica gel and alumina.
5 more elements
Dependencies are inferred from the claim text.