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    Chromatographic analysis of ionic species
    4.
    发明授权
    Chromatographic analysis of ionic species 失效
    离子色谱的色谱分析

    公开(公告)号：US3925019A

    公开(公告)日：1975-12-09

    申请号：US38626173

    申请日：1973-08-06

    Applicant: DOW CHEMICAL CO

    Inventor： HAMISH SMALL ,  STEVENS TIMOTHY S

    IPC: B01J39/26 ,  G01N30/40 ,  G01N30/46 ,  G01N30/52 ,  G01N30/60 ,  G01N30/96 ,  G01N27/08 ,  G01N31/04 ,  G01N31/08

    CPC classification number: G01N30/461 ,  B01J39/26 ,  G01N30/96 ,  G01N2030/402 ,  G01N2030/525 ,  G01N2030/965

    Abstract: Apparatus and method for chromatographic quantitative analysis of a solution containing a plurality of species of cations. A sample of the solution is added to a first ion exchange resin bed containing cation exchange resin and eluted therefrom with a solution of developing reagent consisting of either AgNO3 or BaCl2, chromatographic separation of the cationic species being achieved as elution proceeds. The effluent from the first ion exchange resin bed is passed through a second ion exchange resin bed containing anion exchange resin in a form appropriate to the precipitation of whichever metal ion is provided by the developing reagent, i.e., chloride or sulfate forms. As elution proceeds the cations exit from the second ion exchange bed without destroying the ionic separation achieved in the first ion exchange resin bed. Each separated cationic species is quantitatively sensed by a detector such as a conductivity cell on exiting from the second ion exchange resin bed.

    Solvent extraction process for the recovery of uranium and rare earth metals from aqueous solutions
    9.
    发明授权
    Solvent extraction process for the recovery of uranium and rare earth metals from aqueous solutions 失效
    从水溶液中回收铀和稀土金属的溶剂萃取方法

    公开(公告)号：US3102782A

    公开(公告)日：1963-09-03

    申请号：US80116459

    申请日：1959-03-23

    Applicant: DOW CHEMICAL CO

    Inventor： HAMISH SMALL

    IPC: B01J20/22 ,  C02F1/28 ,  C22B60/02

    CPC classification number: B01J20/22 ,  C02F1/288 ,  C02F2101/006 ,  C08K5/53 ,  C08L51/00 ,  C22B60/0265

    Abstract: The invention comprises particles or granules of a hydrophobic synthetic polymer wherein each particle or granule has or is surrounded by an integral thin surface layer of hydrophilic polymer, e.g. a layer produced by the introduction of hydrophilic groups on to or into the surface layer of preformed particles or granules of hydrophobic polymer, desirably in amount such that the hydrophilic groups are present in from 0,001 to 0,150 milliequivalents of hydrogen per gram of dry hydrophobic polymer. In particular, granules of a polymer of a monoalkenyl aromatic hydrocarbon, preferably cross-linked with a divinyl aromatic hydrocarbon, is surface sulphonated by the use of conc. sulphuric acid at 80 DEG to 100 DEG C. for between 1 and 120 minutes to give products which, when swollen with an organic liquid containing a complexing agent for heavy metal values (e.g. perchloroethylene+a trialkyl phosphate), find application in the recovery of heavy metal values from aqueous solutions. Specification 784,028 is referred to.ALSO:Heavy metal values are removed from aqueous solutions thereof by treatment with gel-like, water-insoluble granules of a copolymer of a monoalkenyl aromatic hydrocarbon and a divinyl aromatic hydrocarbon, said copolymer containing surface substituted hydrophilic groups of formula -SO3X, wherein X is H or a metal, said hydrophilic groups being in amount corresponding to from 0,001 to 0,150 milliequivalents of hydrogen per gram of said dry surface sulphonated copolymer, and said copolymer granules being swollen with an organic liquid (e.g. perchloroethylene) containing a trialkyl phosphate as complexing agent for heavy metal values. The heavy metal values may be extracted from the copolymer granules by a subsequent wash with water or with an aqueous medium containing a mineral acid. The examples illustrate the extraction of uranyl, thorium and yttrium nitrates from aqueous media using sulphonated copolymers swollen with perchloroethylene containing various trialkyl phosphates. Specification 784,028 is referred to.

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