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    • 37. 发明授权
    • Method and apparatus for continuously determining total copper in an aqueous stream
    • 用于连续测定含水流中总铜的方法和装置
    • US3898042A
    • 1975-08-05
    • US43030774
    • 1974-01-02
    • DOW CHEMICAL CO
    • WEBB BENTON PBULLARD GORDON R
    • G01N21/75G01N31/16G01N33/18G01N21/02G01N29/00
    • G01N21/75G01N31/166G01N33/1813Y10T436/117497
    • A method for continuously determining the total copper content of an aqueous analysis stream containing at least about one part per billion total copper in at least one of ionic, particulate, and complexed forms which comprises: (a) providing a stream analysis instrument having a flow-through type cell and adapted for continuous measurement of light absorbance at about 435 nm; (b) contacting and intimately admixing the analysis stream with a continuous flow of hydrofluoric acid; (c) continuously filtering the acid-treated stream prior to introduction of said stream into the cell of the stream analysis instrument; (d) continuously adding to and mixing with the analysis stream an aqueous solution of a chelant-buffer reagent selected from the group consisting of ammonium and alkali metal citrates and one of the ammonium and alkali metal salts of nitrogen-containing chelates having from 1 to 5 carboxyl groups, or a mixture thereof, the quantity of the reagent being sufficient to adjust the pH of the stream to from about 6 to about 7; (e) continuously adding to and mixing with the analysis stream an aqueous solution of a water soluble dithiocarbamate reagent whereby a complex thereof is formed with the copper present in the buffered stream; (f) quantitatively detecting said complex by measuring, by means of the stream analysis instrument, the light absorbance of the treated stream at 435 nm; and (g) comparing the absorbance of the treated stream to that of similarly treated standard solutions of known copper content. An apparatus adapted to accomplishing this method is also described.
    • 一种用于连续地确定含有至少约十分之一十亿的总离子铜,至少一种离子,微粒和络合物形式的含水分析流的铜含量的方法,其包括:(a)提供具有流动性的流分析仪器 通过型细胞并适于连续测量约435nm处的吸光度; (b)使分析流与连续的氢氟酸流接触并密切混合; (c)在将所述物流引入流分析仪器的细胞之前,连续过滤酸处理的物流; (d)向所述分析流中连续添加和混合选自铵和碱金属柠檬酸盐的螯合缓冲剂的水溶液和含氮螯合物的铵和碱金属盐之一,其具有1至 5个羧基或其混合物,试剂的量足以将流的pH调节至约6至约7; (e)连续地向分析流中加入水溶性二硫代氨基甲酸盐试剂的水溶液,由此形成其中存在于缓冲流中的铜的络合物; (f)通过流式分析仪器测量处理过的物流在435nm处的光吸收值来定量检测所述复合物; 和(g)将经处理的流的吸光度与已知铜含量的类似处理的标准溶液的吸光度进行比较。 还描述了适于实现该方法的装置。
    • 40. 发明授权
    • Iodonium compounds of 3,5-dimethylisoxazole
    • 3,5-二甲基唑的碘化合物
    • US3896140A
    • 1975-07-22
    • US32050873
    • 1973-01-02
    • DOW CHEMICAL CO
    • PLEPYS RAYMOND AJEZIC ZDRAVKO
    • C07D261/10C07D85/22
    • C07D261/10
    • IN WHICH Ar is thienyl, phenoxyphenyl, phenyl or substituted phenyl and X is a trifluoroacetate, trichloroacetate, chloride or bromide anion. The compounds are prepared by (a) oxidation of 4iodo-3,5-dimethylisoxazole to 3,5-dimethyl-4(bis(trifluoroacetoxy)iodo)isoxazole, and condensation of the latter with the corresponding activated aromatic compound, ArH or (b) acid-catalyzed condensation of a diacetoxyiodobenzene with 3,5-dimethylisoxazole when the benzene nucleus has halo substitution, i.e., for electrophilic substitution on the isoxazole ring. The compounds have antimicrobial activity.
      Concerns 3,5-dimethyl-4-isoxazolyliodonium salts of the formula
    • 湿法烟气脱硫(WFGD)系统中使用的含石灰石的浆料的石灰石溶解速率通过加入铵离子而增强。 铵离子可以通过将含有石灰石的浆料气体或氨水和/或水溶性铵盐如硫酸铵,氯化铵或碳酸铵掺入而获得。 增加在WFGD系统中使用的含石灰石的浆料的石灰石溶解速率允许使用石灰石颗粒,较低的石灰石化学计量和较低的浆料循环利用率,从而节省资本和运营成本。 铵离子可以在该过程中回收和重复使用。