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1.发明授权
公开(公告)号：US5391268A
公开(公告)日：1995-02-21
申请号：US278527
申请日：1994-07-20
CPC分类号： C25B1/22 , B01D61/44 , C01B21/1472
摘要： The present invention relates to an electrochemical process for the removal of excess or residual nitric acid from aqueous hydroxylammonium nitrate (HAN) solutions. The process utilizes a multi-compartment electrochemical membrane cell in which the HAN solution flows through a central ion exchanging compartment bounded by anion membranes on either side. Electrochemically generated OH-ions formed at the cathode are used to displace and remove the nitric acid from the HAN solution. In use, the residual nitric acid content in the HAN is suitably reduced to a specified safe level before the HAN is concentrated to a 13.0 molar final composition.
摘要翻译： 本发明涉及从硝酸羟铵（HAN）溶液中除去过量或残留硝酸的电化学方法。 该方法利用多室电化学膜电池，其中HAN溶液流过任一侧由阴离子膜界定的中心离子交换室。 在阴极处形成的电化学生成的OH-离子用于从HAN溶液中置换和除去硝酸。 在使用中，在将HAN浓缩至13.0摩尔的最终组合物之前，将HAN中的残留硝酸含量适当地降低至指定的安全水平。
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2.发明授权Chloric acid-alkali metal chlorate mixtures for chlorine dioxide generation 失效用于二氧化氯生成的氯酸 - 碱金属氯酸盐混合物
公开(公告)号：US5242553A
公开(公告)日：1993-09-07
申请号：US918334
申请日：1992-07-21
CPC分类号： C25B1/26 , B01J19/2475 , C01B11/023 , C01B11/12 , B01J2219/00058 , B01J2219/00103 , B01J2219/00164
摘要： An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The process comprises feeding an aqueous solution of an alkali metal chlorate to the ion exchange compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the ion exchange compartment into the cathode compartment, removing the aqueous solution of chloric acid and alkali metal chlorate from the ion exchange compartment, and, increasing the concentration of chloric acid in the aqueous solution of chloric acid which is substantially free of anionic and cationic impurities to to provide a chloric acid concentration of 1.0 normal or greater.
摘要翻译： 在具有阳极室，阴极室和在阳极室和阴极室之间的至少一个离子交换室的电解池中产生氯酸和碱金属氯酸盐的水溶液。 该方法包括将碱金属氯酸盐的水溶液进料到离子交换室，电解阳极室中的阳极电解液以产生氢离子，使来自阳极室的氢离子通过阳离子交换膜进入离子交换隔室以使其位移 生成氯酸和碱金属氯酸盐的水溶液，使碱金属离子从离子交换室进入阴极室，从离子交换室除去氯酸和碱金属氯酸盐水溶液，并增加 基本上不含阴离子和阳离子杂质的氯酸水溶液中的氯酸浓度提供1.0正常或更高的氯酸浓度。
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公开(公告)号：US5599518A
公开(公告)日：1997-02-04
申请号：US348012
申请日：1994-12-01
IPC分类号： C01B11/02
CPC分类号： C01B11/022 , Y02P20/129
摘要： A process and apparatus for producing chlorine dioxide comprising chemically reducing chloric acid with water in the presence of any oxygen-evolving catalyst and in the absence of another acid or an added reducing agent, thereby producing chlorine dioxide and oxygen.
摘要翻译： 一种用于生产二氧化氯的方法和装置，包括在存在任何析氧催化剂的情况下和在不存在另一种酸或添加的还原剂的情况下用水化学还原氯酸，从而产生二氧化氯和氧气。
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4.发明授权Chloric acid - alkali metal chlorate mixtures and chlorine dioxide generation 失效氯酸 - 碱金属氯酸盐混合物和二氧化氯的产生
公开(公告)号：US5348683A
公开(公告)日：1994-09-20
申请号：US42436
申请日：1993-04-05
CPC分类号： C25B1/26 , B01J19/2475 , C01B11/023 , C01B11/12 , B01J2219/00058 , B01J2219/00103 , B01J2219/00164
摘要： An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The process comprises feeding an aqueous solution of an alkali metal chlorate to the ion exchange compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the ion exchange compartment into the cathode compartment, removing the aqueous solution of chloric acid and alkali metal chlorate from the ion exchange compartment, and, increasing the chlorate ion concentration to provide the aqueous solution of chloric acid and alkali metal chlorate with a total chlorate ion to water molar ratio of about 0.15 or greater.
摘要翻译： 在具有阳极室，阴极室和在阳极室和阴极室之间的至少一个离子交换室的电解池中产生氯酸和碱金属氯酸盐的水溶液。 该方法包括将碱金属氯酸盐的水溶液进料到离子交换室，电解阳极室中的阳极电解液以产生氢离子，使来自阳极室的氢离子通过阳离子交换膜进入离子交换隔室以使其位移 生成氯酸和碱金属氯酸盐的水溶液，使碱金属离子从离子交换室进入阴极室，从离子交换室除去氯酸和碱金属氯酸盐水溶液，并增加 氯酸根离子浓度提供氯酸和碱金属氯酸盐的水溶液，总氯酸根离子与水的摩尔比约为0.15或更大。
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5.发明授权Chloric acid - alkali metal chlorate mixtures and chlorine dioxide generation 失效氯酸 - 碱金属氯酸盐混合物和二氧化氯的产生
公开(公告)号：US5258105A
公开(公告)日：1993-11-02
申请号：US786155
申请日：1991-10-31
CPC分类号： B01J19/2475 , C01B11/023 , C01B11/12 , C25B1/26 , B01J2219/00058 , B01J2219/00103 , B01J2219/00164
摘要： An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The process comprises feeding an aqueous solution of an alkali metal chlorate to the ion exchange compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the ion exchange compartment into the cathode compartment, removing the aqueous solution of chloric acid and alkali metal chlorate from the ion exchange compartment, and, increasing the chlorate ion concentration to provide the aqueous solution of chloric acid and alkali metal chlorate with a total chlorate ion to water molar ratio of about 0.15 or greater.
摘要翻译： 在具有阳极室，阴极室和在阳极室和阴极室之间的至少一个离子交换室的电解池中产生氯酸和碱金属氯酸盐的水溶液。 该方法包括将碱金属氯酸盐的水溶液进料到离子交换室，电解阳极室中的阳极电解液以产生氢离子，使来自阳极室的氢离子通过阳离子交换膜进入离子交换隔室以使其位移 生成氯酸和碱金属氯酸盐的水溶液，使碱金属离子从离子交换室进入阴极室，从离子交换室除去氯酸和碱金属氯酸盐水溶液，并增加 氯酸根离子浓度提供氯酸和碱金属氯酸盐的水溶液，总氯酸根离子与水的摩尔比约为0.15或更大。
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公开(公告)号：US5089095A
公开(公告)日：1992-02-18
申请号：US502206
申请日：1990-03-30
申请人： David W. Cawlfield , Jerry J. Kaczur , Budd L. Duncan , Sudhir K. Mendiratta , Ronald L. Dotson , Kenneth E. Woodard, Jr.
发明人： David W. Cawlfield , Jerry J. Kaczur , Budd L. Duncan , Sudhir K. Mendiratta , Ronald L. Dotson , Kenneth E. Woodard, Jr.
IPC分类号： C25B1/26
CPC分类号： C25B1/26
摘要： A process for producing chlorine dioxide by oxidizing a hypochlorous acid solution to produce a chloric acid solution, and, electrolyzing the chloric acid solution to produce chlorine dioxide.The novel process of the present invention provides a commercially viable process for producing the chloric acid and eliminates the formation of an acidic salt solution in the production of chlorine dioxide which requires disposal. Further, the process permits a reduction in the amount of acid required in the generation of chlorine dioxide.
摘要翻译： 通过氧化次氯酸溶液以产生氯酸溶液来生产二氧化氯的方法，以及电解氯酸溶液以产生二氧化氯。 本发明的新方法提供了一种商业上可行的氯酸生产方法，并且在生产需要处理的二氧化氯中消除酸性盐溶液的形成。 此外，该方法允许减少产生二氧化氯所需的酸的量。
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公开(公告)号：US5376240A
公开(公告)日：1994-12-27
申请号：US156326
申请日：1993-11-23
CPC分类号： C02F1/4676 , C02F1/4678 , C02F2001/46128 , C02F2001/46142 , C02F2001/46157 , C02F2101/163 , C02F2101/166 , C02F2201/46115
摘要： A process for electrochemically treating an aqueous solution containing inorganic oxynitrogen species is disclosed in which the aqueous solution is fed into the catholyte compartment of an electrochemical reduction cell using a high surface area cathode separated from an anolyte compartment to electrochemically reduce substantially all of the oxynitrogen species to nitrogen or ammonia and produce a purified water product.
摘要翻译： 公开了一种用于电化学处理含有无机含氧物质的水溶液的方法，其中使用从阳极电解液室分离的高表面积阴极将水溶液进料到电化学还原电池的阴极电解液室中，从而电化学地还原所有的含氧物质 加到氮气或氨水中并产生净化水产品。
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8.发明授权Effluent treatment in a process for producing chlorine dioxide from chloric acid 失效在氯酸生产二氧化氯的过程中的废水处理
公开(公告)号：US5354435A
公开(公告)日：1994-10-11
申请号：US999419
申请日：1992-12-31
申请人： Jerry J. Kaczur , David W. Cawlfield , Kenneth E. Woodard, Jr. , Budd L. Duncan , Sudhir K. Mendiratta
发明人： Jerry J. Kaczur , David W. Cawlfield , Kenneth E. Woodard, Jr. , Budd L. Duncan , Sudhir K. Mendiratta
CPC分类号： C25B1/26 , B01J19/2475 , C01B11/023 , B01J2219/00058 , B01J2219/00103 , B01J2219/00164 , Y10S423/13
摘要： The novel process of the invention produces chlorine dioxide by feeding an aqueous solution of chloric acid to a chlorine dioxide generator. The aqueous solution of chloric acid is reacted with a reducing agent in the chlorine dioxide generator to produce chlorine dioxide and a spent chloric acid solution containing metallic impurities. A portion of the spent chloric acid solution containing metallic impurities is reacted with a basic compound selected from the group consisting of alkali metal hydroxides, and alkali metal carbonates in a neutralizing zone to form a precipitate of the metallic impurities and an alkali metal chlorate solution. The precipitate of the metallic impurities is separated from the alkali metal chlorate solution and the alkali metal chlorate solution fed to an ion exchange compartment of an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. Electrolysis of an anolyte in the anode compartment generates hydrogen ions which pass through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate. The aqueous solution of chloric acid and alkali metal chlorate is returned to the chlorine dioxide generator. The process of the invention produces chlorine dioxide free of chlorine from mixtures of oxy-chlorine species. A continuous removal of metallic impurities permits avoiding or significantly increasing the time period between generator shutdowns.
摘要翻译： 本发明的新方法通过将氯酸水溶液进料给二氧化氯发生器来产生二氧化氯。 将氯酸水溶液与二氧化氯发生器中的还原剂反应，产生二氧化氯和含有金属杂质的废氯酸溶液。 将一部分含有金属杂质的废氯酸溶液与中和区中碱金属氢氧化物和碱金属碳酸盐组成的一组碱性化合物反应，形成金属杂质和碱金属氯酸盐溶液的沉淀物。 将金属杂质的沉淀物从碱金属氯酸盐溶液和进料到具有阳极室，阴极室和在阳极室之间的至少一个离子交换隔室的电解池的离子交换隔室中分离出来的碱金属氯酸盐溶液 和阴极室。 阳极室中的阳极电解液的电解产生氢离子，其通过阳离子交换膜进入离子交换隔室以置换碱金属离子并产生氯酸和碱金属氯酸盐的水溶液。 将氯酸和碱金属氯酸盐的水溶液返回到二氧化氯发生器。 本发明的方法由氧 - 氯物质的混合物产生不含氯的二氧化氯。 持续去除金属杂质可以避免或显着增加发电机停机之间的时间。
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9.发明授权Electrochemical process for generating chlorine dioxide using chloric acid-alkali metal chlorate mixtures 失效使用氯酸 - 碱金属氯酸盐混合物产生二氧化氯的电化学工艺
公开(公告)号：US5296108A
公开(公告)日：1994-03-22
申请号：US919813
申请日：1992-07-24
CPC分类号： C25B1/26 , B01J19/2475 , C01B11/023 , B01J2219/00058 , B01J2219/00103 , B01J2219/00164 , Y10S423/13
摘要： An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The process comprises feeding an aqueous solution of an alkali metal chlorate to the ion exchange compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the ion exchange compartment into the cathode compartment, removing the aqueous solution of chloric acid and alkali metal chlorate from the ion exchange compartment, and reacting the aqueous solution of chloric acid and alkali metal chlorate with a strong acid having a dissociation constant of 1.times.10.sup.-4 or greater and a reducing agent to generate chlorine dioxide gas.
摘要翻译： 在具有阳极室，阴极室和在阳极室和阴极室之间的至少一个离子交换室的电解池中产生氯酸和碱金属氯酸盐的水溶液。 该方法包括将碱金属氯酸盐的水溶液进料到离子交换室，电解阳极室中的阳极电解液以产生氢离子，使来自阳极室的氢离子通过阳离子交换膜进入离子交换隔室以使其位移 产生氯酸和碱金属氯酸盐的水溶液，使碱金属离子从离子交换室进入阴极室，从离子交换室除去氯酸和碱金属氯酸盐的水溶液，并使 具有解离常数为1×10 -4以上的强酸的氯酸和碱金属氯酸盐水溶液和还原剂以产生二氧化氯气体。
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公开(公告)号：US5282935A
公开(公告)日：1994-02-01
申请号：US867557
申请日：1992-04-13
CPC分类号： B01D61/445 , B01D61/52 , C01D1/40
摘要： A bipolar water ionizing electrode and a process employing such an electrode in an electrodialytic cell are disclosed. The cell has a plurality of ion exchange compartments separated by cation permselective membranes and the bipolar water ionizing electrode. The bipolar electrode is permeable to gas and electric current and impervious to liquid.
摘要翻译： 公开了双极水电离电极和在电渗析池中使用这种电极的方法。 电池具有多个由阳离子选择选择膜和双极水离子电极隔开的离子交换室。 双极电极对气体和电流是可渗透的，不透液体。
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