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    • 34. 发明授权
    • Electrolytic process for treating aqueous waste streams
    • 用于处理含水废水流的电解过程
    • US6132590A
    • 2000-10-17
    • US88195
    • 1998-06-01
    • Stephen W. MoranJohn R. Jackson
    • Stephen W. MoranJohn R. Jackson
    • B01D53/14C10G19/08C25B1/16C25B1/20C25B1/00
    • C25B1/16B01D53/1418B01D53/1425C10G19/08C25B1/20
    • An electrochemical process for the production of a hydroxide solution and a sulfate by the electrolysis of a waste aqueous mixture of oxidizable sulfur impurities in the anode compartment of at least one electrolytic cell while producing a hydroxide solution in the cathode compartment of the cell. The process is particularly applicable to the treatment of spent caustic solutions obtained by scrubbing a hydrocarbon process stream contaminated with oxidizable sulfur impurities. The electrolytic cell used in the electrolysis process of the invention can use either a porous membrane or a cationic permselective membrane to separate the anode and cathode compartments of the electrolysis cell. The electrolysis cell can be monopolar or bipolar and when bipolar, the bipolar electrodes if dissimilar, or the respective anode and cathode current collectors if dissimilar, which are attached thereto, are electrically connected by bonding with a conductive polymer or are joined by welding with or without an intermediate metal layer therebetween. Control of pH in the anolyte compartment of the electrolytic cell can be achieved by passing a selected amount of catholyte to the anolyte compartment. Pre-treatment with oxygen produced in the anolyte compartment of the cell avoids release of gaseous products from the anolyte compartment and increases process efficiency. Where the process is conducted in multiple electrolytic cells, such cells are hydraulically connected in a cascading series.
    • 一种用于通过在至少一个电解池的阳极室中电解可氧化硫杂质的废水性混合物,同时在电池的阴极室中产生氢氧化物溶液来生产氢氧化物溶液和硫酸盐的电化学方法。 该方法特别适用于通过洗涤被可氧化的硫杂质污染的烃工艺流而获得的废碱溶液的处理。 在本发明的电解方法中使用的电解槽可以使用多孔膜或阳离子选择性选择膜来分离电解槽的阳极室和阴极室。 电解电池可以是单极的或双极的,并且当双极性时,双极电极如果不相似,或者相关的阳极和阴极集电器(如果不相似)通过与导电聚合物的结合而电连接,或者通过焊接或/ 其间没有中间金属层。 可以通过将选定量的阴极电解液通入阳极电解液室来实现对电解池的阳极电解液室中的pH的控制。 在细胞的阳极电解液室中产生的氧的预处理避免了气体产物从阳极电解液室释放并提高了工艺效率。 当该工艺在多个电解槽中进行时,这种电池在级联系列中液压连接。
    • 37. 发明授权
    • Removal of heavy metals from brine
    • 从盐水中去除重金属
    • US4155819A
    • 1979-05-22
    • US905821
    • 1978-05-15
    • William W. Carlin
    • William W. Carlin
    • C01D3/16C25B1/34C25B15/08C25B1/20C25B1/26
    • C25B1/34C01D3/16C25B15/08
    • Disclosed is a method of electrolyzing alkali metal chloride brine. The method comprises feeding fortified brine to an electrolytic cell, passing an electrical current through the cell, and withdrawing depleted brine from the cell. Hydrochloric acid is added to the depleted brine to dechlorinate it; and the depleted, dechlorinated brine is then contacted with solid salt to refortify the brine. The solid brine is a source of heavy metal impurities. Sodium carbonate and barium carbonate are added to the refortified brine in order to precipitate calcium and sulfate ions therefrom. The precipitate is then separated from the refortified brine in order to obtain a refortified, purified brine. According to the disclosed method, ferrous ion and sufficient hydroxyl ion are added to the dechlorinated, depleted brine prior to its refortification in order to maintain the pH thereof above about 7 during fortification. After refortification, the pH is adjusted to pH 7 by the addition of hydrochloric acid and heavy metal impurities, such as vanadium, are flocculated therefrom. According to an alternate method, the pH can be adjusted to pH 2 by the addition of HCl and then to pH 7 by the addition of NaOH.
    • 公开了一种电解碱金属氯化物盐水的方法。 该方法包括将强化的盐水加入到电解池中,使电流通过电池,并从电池中取出耗尽的盐水。 将盐酸加入到耗尽的盐水中以使其脱氯; 然后将贫化的脱氯盐水与固体盐接触以使盐水回收。 固体盐水是重金属杂质的来源。 将碳酸钠和碳酸钡加入到经过净化的盐水中以从其中沉淀出钙和硫酸根离子。 然后将沉淀物与再循环的盐水分离,以获得经过再纯化的纯化盐水。 根据所公开的方法,将亚铁离子和足够的羟基离子在其重新净化之前加入到脱氯的贫化盐水中,以便在强化期间将其pH保持在约7以上。 经过重新组装后,通过加入盐酸将pH值调节至pH7,并从其中絮凝重金属杂质(如钒)。 根据另一种方法,可以通过加入HCl将pH调节至pH 2,然后通过加入NaOH将pH调节至pH7。