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1.发明授权
公开(公告)号：US5051155A
公开(公告)日：1991-09-24
申请号：US632417
申请日：1990-12-21
CPC分类号： C25B1/22
摘要： A process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in an electrolytic cell in which the anode and cathode chambers are separated by cation exchange member, the improvement wherein the formation of deposits on the membrane is prevented comprising continuously introducing a solution containing chromate at a pH of about 3 to 10 into the cathode chamber during the electrolysis.
摘要翻译： 通过在阳极交换构件中分离阳极室和阴极室的电解池中电解单色和/或重铬酸盐溶液来制备碱金属重铬酸盐和铬酸的方法，其中在膜上形成沉积物 可防止在电解过程中将含有约3〜10的pH的铬酸盐溶液连续引入阴极室。
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2.发明授权Process for the preparation of alkali metal dichromates and chromic acid by electrolysis 失效通过电解制备碱金属重铬酸盐和铬酸的方法
公开(公告)号：US5127999A
公开(公告)日：1992-07-07
申请号：US713625
申请日：1991-06-10
摘要： A process for the preparation of alkali metal dichromates and/or chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solution in electrolysis cells, the anode and cathode compartments of which are separated by cation exchange membranes, wherein the cation exchange membranes are single-layer membranes based on perfluorinated polymers having sulfonic acid groups as cation exchange groups, and an aqueous solution having a pH of 4 to 14 is produced in the cathode compartment of the cells.
摘要翻译： 一种通过在电解池中电解碱金属单色和/或碱金属重铬酸盐溶液来制备碱金属重铬酸盐和/或铬酸的方法，其阳极和阴极室由阳离子交换膜分离，其中阳离子交换膜 是基于具有磺酸基作为阳离子交换基团的全氟化聚合物的单层膜，并且在电池的阴极室中产生pH为4至14的水溶液。
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3.发明授权
公开(公告)号：US5094729A
公开(公告)日：1992-03-10
申请号：US659435
申请日：1991-02-22
CPC分类号： C25B1/22
摘要： A process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in an electrolytic cell in which the anode and cathode chamber are separated by a cation exchanger membrane anolyte fluid containing dichromate and/or chromic acid being formed in the anode chamber and alkaline catholyte fluid containing alkali metal ions being formed in the cathode chamber, the improvement wherein the catholyte fluids are periodically replaced by a solution which is at a pH below 6.
摘要翻译： 通过在电解池中电解单色和/或重铬酸盐溶液来制备碱金属重铬酸盐和铬酸的方法，其中阳极室和阴极室由含有重铬酸盐和/或铬酸的阳离子交换膜阳极电解液分离， 形成在阳极室中，并且在阴极室中形成含有碱金属离子的碱性阴极电解液，其中阴极电解液周期性地被pH低于6的溶液所取代。
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公开(公告)号：US5071522A
公开(公告)日：1991-12-10
申请号：US663031
申请日：1991-02-25
CPC分类号： C25B1/22
摘要： A process for the preparation of chromic acid by the electrolysis of dichromate and/or monochromate solutions in electrolytic cells in which the anode chamber and the cathode chamber are separated by a cation exchanger membrane, the improvement wherein the chromic acid content of the solution in the anode chamber is periodically increased above that of a continuous operating state.
摘要翻译： 通过在阳极室和阴极室被阳离子交换膜分离的电解池中电解重铬酸盐和/或单色溶液来制备铬酸的方法，其中溶液的铬酸含量在 阳极室周期性地增加到高于连续工作状态的阳极室。
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5.发明授权Process for the production of alkali dichromates and chromic acid employing an anode of valve metal activated by electrodepositing noble metals from melts 失效使用通过从熔体中电沉积贵金属而活化的阀门金属的阳极来生产碱性重铬酸盐和铬酸的方法
公开(公告)号：US4981573A
公开(公告)日：1991-01-01
申请号：US392873
申请日：1989-08-11
申请人： Helmut Klotz , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
发明人： Helmut Klotz , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
CPC分类号： C25B1/22
摘要： A process for the production of alkali dichromates and chromic acid by electrolysis of alkali monochromate or alkali dichromate solutions wherein the anodes used in the electrolysis are dimensionally stable anodes of valve metals activated by electrodeposition of noble metals and/or noble compounds from melts containing noble metal salts.
摘要翻译： 通过电解碱性单色酸盐或碱性重铬酸盐溶液来生产碱性重铬酸盐和铬酸的方法，其中用于电解的阳极是通过从含有贵金属的熔体电沉积贵金属和/或贵金属而活化的阀金属的尺寸稳定的阳极 盐。
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6.发明授权Dimensionally stable anodes and their use in the preparation of alkali metal dichromates and chromic acid 失效尺寸稳定的阳极及其在制备碱金属重铬酸盐和铬酸中的应用
公开(公告)号：US5128000A
公开(公告)日：1992-07-07
申请号：US680602
申请日：1991-04-01
申请人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block
发明人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block
CPC分类号： C25B1/22 , C25B1/14 , C25B11/0478
摘要： A dimensionally stable anode comprised ofa) an electrically conductive valve metalb) a conductive intermediate layer andc) an electrode coating of an electrocatalytically active substance, wherein the intermediate layer comprises one or more noble metals or their alloys which have been applied to the valve metal by deposition by electroplating from melts containing noble metal salts. This anode can be used in the production alkali metal dichromates and chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solutions.
摘要翻译： 一种尺寸稳定的阳极，包括a）导电阀金属b）导电中间层和c）电催化活性物质的电极涂层，其中所述中间层包含一种或多种贵金属或其合金，其被施加到 通过从含有贵金属盐的熔体中电镀而沉积阀门金属。 该阳极可以通过电解碱金属单色和/或碱金属重铬酸盐溶液来生产碱金属重铬酸盐和铬酸。
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公开(公告)号：US5068015A
公开(公告)日：1991-11-26
申请号：US393733
申请日：1989-08-15
申请人： Hans-Dieter Block , Norbert Lonhoff , Bernd Makowka , Helmut Klotz , Rainer Weber , Bernhard Spreckelmeyer
发明人： Hans-Dieter Block , Norbert Lonhoff , Bernd Makowka , Helmut Klotz , Rainer Weber , Bernhard Spreckelmeyer
CPC分类号： C25B1/22
摘要： A process for the production of chromic acid by the multistage electrolysis of dichromate and/or monochromate solutions in two-compartment electrolysis cells, of which the anode and cathode compartments are separated by cation exchanger membranes, at temperatures in the range from 50.degree. to 90.degree. C., the dichromate and/or monochromate solutions being obtained by the digestion of chrome ores and leaching, the improvement wherein, optionally after the removal of aluminum, vanadium and other impurities, the monochromate solution obtained after leaching is adjusted at 20.degree. to 110.degree. C. to a pH value of from 8 to 12 by the addition and/or in situ formation of carbonate in a quantity of from 0.01 to 0.18 mol/l (for 300 to 500 g/l Na.sub.2 CrO.sub.4, converted with CO.sub.2 under pressure into a dichromate-containing solution, the dichromate-containing solution is introduced into the anode compartment of the electrolysis cell, a solution containing chromic acid, in which the molar ratio of Na ions to chromic acid is from 0.45:0.55 to 0.30:0.70, is electrolytically produced and the chromic acid is worked up by crystallization, washing and drying.
摘要翻译： 通过在两室电解池中的重铬酸盐和/或单色溶液的多级电解生产铬酸的方法，其中阳极和阴极室由阳离子交换膜分离，温度范围为50至90℃ ℃，通过铬矿和沥滤的消解获得的重铬酸盐和/或单色溶液，其中任选地在除去铝，钒和其它杂质之后，将浸出后获得的单色溶液调节至20℃至 通过加入和/或原位形成量为0.01至0.18mol / l的碳酸盐（对于300至500g / l的Na 2 CrO 4，在压力下用CO 2转化），将pH值为8至12 将含有重铬酸盐的溶液引入电解槽的阳极室中，将含有铬酸的溶液与Na离子的摩尔比 欧米酸为0.45:0.55-0.30:0.70，经电解生产，铬酸通过结晶，洗涤和干燥处理。
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公开(公告)号：US4152226A
公开(公告)日：1979-05-01
申请号：US869065
申请日：1978-01-12
CPC分类号： C25B15/02
摘要： The sodium concentration in the amalgam of an electrolysis cell is automatically monitored by periodically removing an amalgam sample of predetermined quantity from the end compartment of the electrolysis cell, introducing the sample into a reference cell containing a reference electrolyte, thereby to form a galvanic element in said reference cell, discharging the galvanic element, and measuring the charge flowing out when the galvanic element is discharged, the charge being an index of the sodium concentration. Advantageously the reference electrolyte is a dilute solution of at least one of sodium hydroxide and sodium chloride. The apparatusincludes many cells and a common distant monitoring station. A voltage which is proportional to the decomposition current of the galvanic element formed by the amalgam and reference electrolyte is fed to the input of a voltage/frequency converter which determines the charge, and the output of the converter is integrated by a subsequent counter chain until the decomposition current is damped.
摘要翻译： 通过从电解槽的末端室周期性地除去预定数量的汞齐样品，自动监测电解槽汞齐中的钠浓度，将样品引入含有参比电解质的参考电池中，从而形成电解元素 所述参考电池，放电电流元件，并测量当电流元件放电时流出的电荷，电荷是钠浓度的指标。 有利地，参考电解质是氢氧化钠和氯化钠中的至少一种的稀释溶液。 该装置包括许多电池和一个常见的远距离监测站。 与由汞齐和参考电解质形成的电流元件的分解电流成比例的电压被馈送到确定电荷的电压/频率转换器的输入端，并且转换器的输出由后续的反向链路整合，直到 分解电流被阻尼。
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公开(公告)号：US5575985A
公开(公告)日：1996-11-19
申请号：US440031
申请日：1995-05-12
申请人： Helmut Klotz , Hans D. Pinter
发明人： Helmut Klotz , Hans D. Pinter
摘要： In the preparation of a graphite body suitable for use as a cathode in an electrolytic process, comprising the steps ofa) contacting a graphite body with a solution in at least one polyhydric alcohol having 2 to 4 carbon atoms of at least one of an iridium salt and rhodium salt for a time sufficient for the solution to penetrate through the surface of the graphite body to a depth of at least about 1 mm, andb) heating and then cooling the graphite body,the improvement which comprises effecting the heating by contacting the surface of the graphite body into which the solution has penetrated with a naked gas flame positioned above such surface, the graphite body being heated to about 200.degree. to 450.degree. C. for about 2 to 10 minutes.
摘要翻译： 在制备适于在电解过程中用作阴极的石墨体中，包括以下步骤：a）使石墨体与至少一种具有2至4个碳原子的至少一种铱的多元醇 盐和铑盐一段时间足以使溶液穿透石墨体的表面至少约1mm的深度，以及b）加热然后冷却石墨体，其改进包括通过接触进行加热 溶液已经用位于该表面上方的裸气焰穿透的石墨体的表面，将石墨体加热至约200℃至450℃约2至10分钟。
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公开(公告)号：US5096547A
公开(公告)日：1992-03-17
申请号：US718729
申请日：1991-06-21
申请人： Helmut Klotz , Rainer Weber , Wolfgang Ohlendorf
发明人： Helmut Klotz , Rainer Weber , Wolfgang Ohlendorf
CPC分类号： B01D61/445 , C25B1/22 , C25B1/28
摘要： The invention relates to a process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in a multi-chamber cell, wherein the anode chamber is shielded from the solution of chromate, dichromate and/or chromic acid by a bipolar ion exchanger membrane.
摘要翻译： 本发明涉及通过在多室电池中电解单色和/或重铬酸盐溶液来制备碱金属重铬酸盐和铬酸的方法，其中阳极室与铬酸盐，重铬酸盐和/或铬酸盐溶液 酸通过双极离子交换膜。
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