Use of dilute aqueous solutions of alkali polysulfides to remove trace amounts of mercury from liquid hydrocarbons
Patent 4915818 Issued on April 10, 1990. Estimated Expiration Date: 
February 25, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 25, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesRetractable chair for small children Sludge treating process Treatment of mercury contaminated aqueous media Stabilization of mercury in mercury-containing materials Recovery of heavy metals from aqueous solutions Patent #: 4619744 InventorAssigneeApplicationNo. 160440 filed on 02/25/1988US Classes:208/251R, Metal contaminant removal208/253, With metal or metal compound208/284, Alkali metal compound210/702, Making an insoluble substance or accreting suspended constituents585/856S containingExaminersPrimary: Caldarola, GlennAttorney, Agent or FirmInternational ClassC10G 017/00AbstractDisclosed is a method of removing mercury from contaminated liquid hydrocarbons (natural gas condensate) by contacting them with a dilute aqueous solution of alkali metal sulfide salt and recovering the treated liquid hydrocarbon. The addition of alkali metal hydroxide enhances the phase separation of hydrocarbon and aqueous solution.Field of SearchMetal contaminant removalAlkali metal compound With subsequent treatment of the oil With Group IB or IIB metal compound With metal or metal compound Electrical transmission or interconnection system: (Class 307) Utilizing solid sorbent, catalyst, or reactant Making an insoluble substance or accreting suspended constituents Including recycling In situ Including chemical reduction Utilizing precipitant, flocculant, or coagulant, each with accelerator or with each other or plural precipitants, flocculants, or coagulants |
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