Chlorine dioxide generation from chloric acid
    1.
    发明授权
    Chlorine dioxide generation from chloric acid 失效
    氯酸二氧化氯产生

    公开(公告)号:US5284553A

    公开(公告)日:1994-02-08

    申请号:US42784

    申请日:1993-04-06

    IPC分类号: C25B1/26

    CPC分类号: C25B1/26

    摘要: Chlorine dioxide, useful as a pulp mill chemical, is produced without producing sodium sulfate effluent for disposal, by effecting reduction of chloric acid in an aqueous reaction medium in a reaction zone at a total acid normality of up to about 7 normal in the substantial absence of sulfate ion and in the promence of a dead load of sodium chlorate added to and subsequently removed from the reaction medium. Chloric acid for the process is produced electrolytically from an aqueous solution of the deadload sodium chlorate and make-up quantities of sodium chlorate. The chloric acid reduction to produce chlorine dioxide may be effected using methanol or electrolytically.

    摘要翻译: 生产可用作纸浆厂化学品的二氧化氯,不生产硫酸钠流出物用于处理,通过在基本不存在的情况下在反应区中的总酸正常值达到约7正常值下降水反应介质中的氯酸 的硫酸根离子,并且承受了加入并随后从反应介质中除去的氯酸钠的静载荷。 该方法中的氯酸是由氯酸氢钠水溶液和补充量的氯酸钠电解产生的。 产生二氧化氯的氯酸还原可以使用甲醇或电解进行。

    Determination of chlorate ion concentration using microelectrodes
    4.
    发明授权
    Determination of chlorate ion concentration using microelectrodes 失效
    使用微电极测定氯酸根离子浓度

    公开(公告)号:US5948236A

    公开(公告)日:1999-09-07

    申请号:US912171

    申请日:1997-08-15

    申请人: Marek Lipsztajn

    发明人: Marek Lipsztajn

    CPC分类号: G01N27/44747 G01N27/333

    摘要: An in-situ procedure is described for measuring chlorate ion concentration in aqueous media containing the same by employing electrodes, particularly microelectrodes which generate a sigmoidal-type response at high chlorate ion concentration, and which exhibit catalytic properties toward chlorate ion electroreduction or electrooxidation.

    摘要翻译: 描述了通过使用电极,特别是产生高氯酸根离子浓度的S形反应的微电极测量含有该氯酸根离子浓度的含水介质中的氯酸根离子浓度,并且显示出对氯酸根离子电还原或电氧化的催化性能的原位程序。

    Dynamic leaching procedure for metathesis
    5.
    发明授权
    Dynamic leaching procedure for metathesis 失效
    复分解的动态浸出程序

    公开(公告)号:US5399332A

    公开(公告)日:1995-03-21

    申请号:US138640

    申请日:1993-10-20

    申请人: Chunmin Pu

    发明人: Chunmin Pu

    IPC分类号: C01B11/02 C01D5/00 C01D15/06

    摘要: Solid sodium sesquisulfate is metathesized by water to neutral anhydrous sodium sulfate and to recover the acid values therefrom by employing a dynamic leaching of the solid phase sodium sesquisulfate, to provide an acid medium for recycle to a chlorine dioxide generating process producing the sodium sesquisulfate without significantly increasing the evaporative load on the generator.

    摘要翻译: 固体倍半硫酸钠由水中性无水硫酸钠复水,并通过使用固相倍半硫酸钠的动态浸提从其中回收酸值,以提供一种酸性介质,用于再循环至产生二氯二氧化氯的方法,而无显着性 增加发电机的蒸发负荷。

    Process for production of chlorine dioxide
    6.
    发明授权
    Process for production of chlorine dioxide 失效
    二氧化氯生产工艺

    公开(公告)号:US5851374A

    公开(公告)日:1998-12-22

    申请号:US781045

    申请日:1997-01-09

    摘要: Chlorine dioxide is produced by reaction of chlorate ions, usually provided by sodium chlorate, with a persulfate in an aqueous acid reaction medium containing sulfuric acid. By-product sodium sulfate, sulfuric acid feedstock or mixture may be electrolyzed to form the persulfate for the reaction.

    摘要翻译: 二氧化氯通过氯酸根离子(通常由氯酸钠提供)与含硫酸的酸性反应介质的过硫酸盐反应产生。 可以将副产物硫酸钠,硫酸原料或混合物电解以形成用于反应的过硫酸盐。

    Metathesis of acidic by-product of chlorine dioxide generating apparatus
    7.
    发明授权
    Metathesis of acidic by-product of chlorine dioxide generating apparatus 失效
    二氧化氯发生装置的酸性副产物的复分解

    公开(公告)号:US5205995A

    公开(公告)日:1993-04-27

    申请号:US844231

    申请日:1992-03-02

    IPC分类号: C01B11/02 C01D5/00

    CPC分类号: C01D5/00 C01B11/023

    摘要: Sodium sesquisulfate produced in crystalline form in a high acidity methanol-based highly efficient chlorine dioxide generating process is converted by metathesis to crystalline anhydrous neutral sodium sulfate and the acid recovered as a result is recycled to the chlorine dioxide generating step. The metathesis is effected by contacting the crystalline sodium sesquisulfate with aqueous sodium chlorate solution, aqueous sodium chloride solution, aqueous methanol or water alone. The metathesis is effected in such manner as to minimize the additional evaporative load imposed on the chlorine dioxide generating process by the metathesis medium.

    摘要翻译: 在高酸性甲醇基高效二氧化氯生成过程中以结晶形式生产的倍半硫酸钠通过复分解转化为结晶无水中性硫酸钠,结果回收的酸被再循环到产生二氧化氯的步骤中。 复分解是通过使结晶倍半硫酸钠与氯酸钠水溶液,氯化钠水溶液,甲醇水溶液或单独的水接触来实现的。 复分解体以使复分解介质施加在二氧化氯产生过程附加的额外蒸发负荷最小化的方式进行。

    Metathesis of acidic by-product of chlorine dioxide generating process
    8.
    发明授权
    Metathesis of acidic by-product of chlorine dioxide generating process 失效
    二氧化氯生成过程的酸性副产物的复分解

    公开(公告)号:US5593653A

    公开(公告)日:1997-01-14

    申请号:US294604

    申请日:1994-08-23

    IPC分类号: C01B11/02 C01D5/00

    CPC分类号: C01B11/023 C01D5/00

    摘要: Sodium sesquisulfate produced in crystalline form in a high acidity highly efficient chlorine dioxide generating process is converted by metathesis to crystalline anhydrous neutral sodium sulfate and the acid recovered as a result is recycled to the chlorine dioxide generating step. The metathesis is effected by contacting the crystalline sodium sesquisulfate with aqueous sodium chlorate solution, aqueous sodium chloride solution, aqueous methanol or water alone. The metathesis is effected in such manner as to minimize the additional evaporative load imposed on the chlorine dioxide generating process by the metathesis medium.

    摘要翻译: 在高酸度高效二氧化氯生成过程中以结晶形式生产的倍半硫酸钠通过复分解转化为结晶无水中性硫酸钠,结果回收的酸被再循环到二氧化氯产生步骤中。 复分解是通过使结晶倍半硫酸钠与氯酸钠水溶液,氯化钠水溶液,甲醇水溶液或单独的水接触来实现的。 复分解体以使复分解介质施加在二氧化氯产生过程附加的额外蒸发负荷最小化的方式进行。

    Membrane cell washing
    9.
    发明授权
    Membrane cell washing 失效
    膜细胞洗涤

    公开(公告)号:US5277768A

    公开(公告)日:1994-01-11

    申请号:US863247

    申请日:1992-04-03

    IPC分类号: C25B15/00 C25B1/16

    CPC分类号: C25B15/00

    摘要: Scale is removed from within cation-exchange membranes by operating the cathode compartment of a cell divided by the cation-exchange membrane with a mildly-acid catholyte while effecting transfer of cationic species from the anode compartment to the cathode compartment.

    摘要翻译: 通过在阳离子物质从阳极室转移到阴极室的同时,用阳离子交换膜除去阳离子交换膜的阴极室,通过使阴离子交换膜从阳离子交换膜中除去垢。

    Membrane cell operation
    10.
    发明授权
    Membrane cell operation 失效
    膜细胞操作

    公开(公告)号:US5256261A

    公开(公告)日:1993-10-26

    申请号:US933108

    申请日:1992-08-21

    CPC分类号: C25B1/265 C25B1/46 C25B15/00

    摘要: The voltage requirements of a membrane-divided cell are decreased by operating the cell with a catholyte temperature significantly in excess of the anolyte temperature, generally at least 10.degree. C. greater and preferably at least 20.degree. C. greater. The invention is particularly useful in an electrochemical acidification process whereby aqueous sodium chlorate and sodium sesquisulfate solution is acidified for use in a chlorine dioxide generating process and aqueous sodium hydroxide is produced as a by-product.

    摘要翻译: 通过使阴极电解液温度显着超过阳极电解液温度操作电池,通常为10℃以上,更优选为至少20℃,从而降低膜分离电池的电压要求。 本发明特别可用于电化学酸化方法,其中将氯酸钠水溶液和倍半硫酸钠溶液酸化以用于产生二氧化氯的方法中,并且生产氢氧化钠水溶液作为副产物。