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US 4,853,109 AGranted
Demetalation of hydrocarbonaceous feedstocks using dibasic carboxylic acids and salts thereof
AssigneeChevron Research Company
InventorJohn G. Reynolds
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Abstract
Dibasic carboxylic acids or salts thereof are used to remove metals, particularly calcium and iron, from hydrocarbonaceous feedstocks. An aqueous solution of the acid is used to extract the metals from the feedstock prior to processing. Oxalic acid is the preferred compound.
Claims13
A method for demetalizing Group IIA and/or Group VIII metals from hydrocarbonaceous feedstock comprising:
- mixing said hydrocarbonaceous feedstock with an aqueous solution of a metals sequestering agent, said agent comprising dibasic carboxylic acid or salts thereof;
- and
- separating the substantially demetalated hydrocarbonaceous feedstock from the aqueous solution;
- wherein the feedstock to be demetalated is selected from the group consisting of crude petroleum, atmospheric or vacuum residua, solvent deasphalted oil derived from these crudes or residua, shale oil, liquefied coal, and tar sand effluent.
1 more element
Dependencies are inferred from the claim text.