Methods for removing iron from crude oil in a two-stage desalting system
August 1, 2010. 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 References 2739103 Methods and compositions for removing deposits containing iron sulfide from surfaces comprising basic aqueous solutions of particular chelating agents Method for breaking petroleum emulsions and the like using thin film spreading agents comprising a polyether polyol Multiple stage desalting and dedusting process Hydroconversion process Decalcification of hydrocarbonaceous feedstocks using amino-carboxylic acids and salts thereof Demetalation of hydrocarbonaceous feedstocks using hydroxo-carboxylic acids and salts thereof Use of reducing agents to control scale deposition from high temperature brine Demetalation of hydrocarbonaceous feedstocks using dibasic carboxylic acids and salts thereof Demetalation of hydrocarbonaceous feedstocks using monobasic carboxylic acids and salts thereof Patent #: 4988433 InventorsAssigneeApplicationNo. 560613 filed on 08/01/1990US Classes:208/252, With acid208/251R, Metal contaminant removal208/282, Organic acid208/311Liquid extraction with solventsExaminersPrimary: Myers, HelaneAttorney, Agent or FirmInternational ClassC10G 017/00AbstractMethods of diminishing the content of soluble and insoluble forms of iron from crude are disclosed. Crude and water soluble chelant are mixed prior to addition of wash water. After wash water addition, an emulsion is formed. After resolution of the emulsion, iron laden water phase is separated resulting in decreased iron content in the crude. In a two-step desalting process, water soluble chelant is mixed with crude separated from the resolved emulsion emanating from the first, upstream, desalter. After such mixing, fresh wash water is added, with the so-formed crude/chelant/wash water mixture being fed to the second, downstream, desalter, for resolution. Crude separated from the second desalter has substantially diminished iron content compared to crude fed to the first desalter. | |
