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1. 发明授权

US5096548A Process for the preparation of chromic acid 失效
标题翻译：制备色素的方法
公开(公告)号：US5096548A
公开(公告)日：1992-03-17
申请号：US626076
申请日：1990-12-11
申请人： Norbert Lonhoff , Ludwig Schmidt , Hans-Dieter Block , Rainer Weber
发明人： Norbert Lonhoff , Ludwig Schmidt , Hans-Dieter Block , Rainer Weber
IPC分类号： C25B1/00 , B01J47/12 , C01G37/033 , C25B1/22 , C25B15/08 , C25C1/10
CPC分类号： C01G37/033 , C25B1/22 , C25C1/10
摘要： A process for the production of chromic acid, comprising(a) dissolving ferrochrome in sulphuric acid and mother liquor from the subsequent crystallization of ammonium chrome alum, optionally with the addition of at least one of catholyte and anolyte overflow from the subsequent electrolysis,(b) removing undissolved constituents by filtration,(c) removing dissolved iron by the addition of at least one of ammonia and ammonium sulphate to the filtrate obtained, crystallizing iron ammonium sulphate and filtering,(d) crystallizing and filtering ammonium chrome alum from the remaining solution and returning the filtrate for dissolving ferrochrome in step (a),(e) dissolving the ammonium chrome alum in water,(f) precipitating and separating chromium-(III) hydroxide from the resulting solution by adding a base, optionally under reducing conditions,(g) dissolving the separated chromium hydroxide in chromic acid and optionally sulphuric acid so that either a single solution in chromic acid is obtained or two solutions are obtained, one in chromic acid and another in sulphuric acid,(h) separating the solution(s) from undissolved constituents, and(i) utilizing the solution of chromium hydroxide in chromic acid as anolyte in the electrolytic production of chromic acid in an electrolytic cell divided by a membrane, and either utilizing the same solution as catholyte in the above mentioned electrolytic cell divided by a membrane or utilizing the solution of chromium hydroxide in sulphuric acid as catholyte in the above mentioned electrolytic cell divided by a membrane, hydrogen and metallic chromium being deposited electrolytically at the cathode and/or chromium (II) ions being produced electrolytically at the cathode.
摘要翻译：一种生产铬酸的方法，包括（a）将铬铁铬酸盐和母液从随后的铵铬明矾结晶中溶解，任选地从随后的电解中加入至少一种阴极电解液和阳极电解液溢出物（b ）通过过滤除去未溶解的组分，（c）通过向所得滤液中加入至少一种氨和硫酸铵除去溶解的铁，结晶硫酸铁铵并过滤，（d）从剩余溶液中结晶并过滤铵铬明矾并在步骤（a）中返回用于溶解铬铁的滤液，（e）将铵铬明矾溶解在水中，（f）通过加入碱（任选在还原条件下）将所得溶液中的铬 - （III）（g）将分离的氢氧化铬溶解在铬酸和任选的硫酸中，使得单一的铬酸溶液得到两种溶液，一种在铬酸中，另一种在硫酸中，（h）将溶液与未溶解的组分分离，和（i）在电解生产中利用铬酸中的铬酸溶液作为阳极电解液在由电解槽中分离的膜中的铬酸，或者利用与上述电解槽中的阴极电解液相同的溶液，或者利用氢氧化铬溶液作为阴极电解液，除去上述电解槽在阴极处电解沉积的阴极和/或铬（II）离子沉积的膜，氢和金属铬。

2. 发明授权

US5181994A Process for the preparation of chromic acid 失效
标题翻译：制备色素的方法
公开(公告)号：US5181994A
公开(公告)日：1993-01-26
申请号：US625715
申请日：1990-12-11
申请人： Norbert Lonhoff , Ludwig Schmidt , Hans-Dieter Block , Rainer Weber
发明人： Norbert Lonhoff , Ludwig Schmidt , Hans-Dieter Block , Rainer Weber
IPC分类号： C25B1/00 , B01J47/12 , C01G37/033 , C25B1/22 , C25B15/08 , C25C1/10
CPC分类号： C25C1/10 , C01G37/033 , C25B1/22
摘要： A process for the production of chromic acid, comprisinga) dissolving ferrochrome in sulphuric acid, optionally with the addition of catholyte and/or anolyte overflow from the electrolysis,b) removing undissolved constituents by filtration,c) adding a reducing agent in a quantity more than equivalent to the quantity of iron(III) and chromium(IV) in the solution,d) precipitating chromium(III) hydroxide by raising the pH to about 4-6 by the addition of a base while maintaining the reducing conditions in the solution,e) separating the precipitated chromium hydroxide while maintaining the reducing conditions,f) working up the aqueous solution containing iron by oxidation; precipitating iron(III) hydroxide or iron(III) oxide and optionally isolating the sulphate in the solution as sodium sulphate, ammonium sulphate or calcium sulphate,g) dissolving the separated chromium hydroxide in chromic acid and optionally sulphuric acid where either a single solution in chromic acid is produced or two solutions are produced, one in chromic acid and another in sulphuric acid,h) separating the solution(s) from undissolved constituents andi) employing the chromium hydroxide solution in chromic acid as anolyte in the electrolytic production of chromic acid in an electrolytic cell divided by a membrane, and either using the same solution as catholyte in the electrolytic cell divided by a membrane or using the chromium hydroxide solution in sulphuric acid as catholyte in the electrolytic cell divided by a membrane, hydrogen and/or metallic chromium being deposited electrolytically at the cathode and/or chromium(II) ions being produced electrolytically.
摘要翻译：一种生产铬酸的方法，包括：a）将铬铁溶解在硫酸中，任选地从电解中加入阴极电解液和/或阳极电解液溢出物，b）通过过滤除去未溶解的组分，c）加入一定量的还原剂大于等于溶液中铁（III）和铬（IV）的量，d）通过加入碱将pH升高至约4-6，沉淀出氢氧化铬（III），同时保持其中的还原条件 e）在保持还原条件的同时分离沉淀的氢氧化铬，f）通过氧化处理含铁的水溶液; 沉淀氧化铁（III）或氧化铁（III），并任选地将溶液中的硫酸盐分离为硫酸钠，硫酸铵或硫酸钙，g）将分离的氢氧化铬溶解在铬酸和任选的硫酸中，产生铬酸或产生两种溶液，一种在铬酸中，另一种在硫酸中，h）将溶液与未溶解的组分分离，以及i）在铬酸的电解生产中使用铬酸中的氢氧化铬溶液作为阳极电解液在电解槽中除以膜，在电解槽中用阴离子电解液分隔膜或使用硫酸中的氢氧化铬溶液作为阴极电解液，在电解槽中被膜，氢和/或阴极电解沉积的金属铬和/或电解产生的铬（II）离子。

3. 发明授权

US5273735A Process for the preparation of sodium dichromate 失效
标题翻译：重铬酸钠的制备方法
公开(公告)号：US5273735A
公开(公告)日：1993-12-28
申请号：US980142
申请日：1992-11-23
申请人： Rainer Weber , Bernd Rosenow , Hans-Dieter Block , Norbert Lonhoff
发明人： Rainer Weber , Bernd Rosenow , Hans-Dieter Block , Norbert Lonhoff
IPC分类号： C01G37/14 , C25B1/28
CPC分类号： C25B1/28 , C01G37/14
摘要： A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution containing 300 to 400 g/l of Na.sub.2 CrO.sub.4 being obtained, conversion of the monochromate ions of this solution into dichromate ions by addition of an acid and/or by electrolysis and/or by reaction with carbon dioxide under pressure and crystallization of sodium dichromate by concentration of this solution. The improvement wherein before the conversion into a sodium dichromate solution, the sodium monochromate solution is concentrated to contents of 700 to 1000 g/l of Na.sub.2 CrO.sub.4, the monochromatic ions, the solution is subsequently freed as far as possible from sodium sulphate by cooling to a temperature of below 0.degree. C. and filtration, and the residual monochromate ions which remain in the solution are converted into dichromate ions by electrolysis and/or by reaction with carbon dioxide and/or with chromic acid.
摘要翻译：一种通过碱性氧化焙烧铬矿石，用水浸泡，调节pH至7至9.5，通过过滤除去不溶成分的方法制备重铬酸钠和重铬酸钠溶液的方法，将含有300〜获得400g / l的Na 2 CrO 4，通过加入酸和/或通过电解和/或通过与压力下的二氧化碳反应并通过浓缩该溶液使重结晶的重结晶，将该溶液的单色离子转化为重铬酸根离子。改进之前，在转化成重铬酸钠溶液之前，将单色钠溶液浓缩至700至1000g / l Na 2 CrO 4的含量，即单色离子，随后将溶液从硫酸钠中冷却至温度低于0℃并过滤，留在溶液中的残留单色离子通过电解和/或通过与二氧化碳和/或与铬酸的反应转化为重铬酸根离子。

4. 发明授权

US5051155A Processes for the preparation of alkali metal dichromates and chromic acid 失效
标题翻译：碱金属重铬酸盐和铬酸的制备方法
公开(公告)号：US5051155A
公开(公告)日：1991-09-24
申请号：US632417
申请日：1990-12-21
申请人： Helmut Klotz , Hans D. Pinter , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
发明人： Helmut Klotz , Hans D. Pinter , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
IPC分类号： C01G37/14 , C25B1/14 , C25B1/22
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 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。

5. 发明授权

US5667759A Method for manufacturing alkali chromates from chromium ore 失效
标题翻译：从铬矿生产铬酸铬的方法
公开(公告)号：US5667759A
公开(公告)日：1997-09-16
申请号：US690420
申请日：1996-07-26
申请人： Rainer Bellinghausen , Heinrich Helker , Paul Strehlow , Hans-Heinrich Moretto , Bernhard Spreckelmeyer , Norbert Lonhoff , Michael Batz , Rainer Weber , Hans Rinkes , Hans-Dieter Block , Uwe Arndt
发明人： Rainer Bellinghausen , Heinrich Helker , Paul Strehlow , Hans-Heinrich Moretto , Bernhard Spreckelmeyer , Norbert Lonhoff , Michael Batz , Rainer Weber , Hans Rinkes , Hans-Dieter Block , Uwe Arndt
IPC分类号： C01G37/14 , C01G37/00
CPC分类号： C01G37/14
摘要： A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.
摘要翻译：描述了在直接加热的旋转管中分解铬矿的方法，其中含氧气体通过下床喷嘴引入回转管中。

6. 发明授权

US4981573A 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
标题翻译：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
IPC分类号： C01G37/14 , C25B1/14 , C25B1/22 , C25B11/08
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。

7. 发明授权

US5505918A Method for manufacturing alkali chromates from chromium ore 失效
标题翻译：从铬矿生产铬酸铬的方法
公开(公告)号：US5505918A
公开(公告)日：1996-04-09
申请号：US314553
申请日：1994-09-28
申请人： Uwe Arndt , Michael Batz , Rainer Bellinghausen , Hans-Dieter Block , Heinrich Helker , Norbert Lonhoff , Hans-Heinrich Moretto , Hans-Georg Nieder-Vahrenholz , Hans Rinkes , Bernhard Spreckelmeyer , Rainer Weber
发明人： Uwe Arndt , Michael Batz , Rainer Bellinghausen , Hans-Dieter Block , Heinrich Helker , Norbert Lonhoff , Hans-Heinrich Moretto , Hans-Georg Nieder-Vahrenholz , Hans Rinkes , Bernhard Spreckelmeyer , Rainer Weber
IPC分类号： C01G37/14 , C22B34/32
CPC分类号： C01G37/14
摘要： A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.
摘要翻译：描述了通过铬矿与碱性化合物的反应并在含有至少50％的氧的气氛中进行氧化来制造碱铬酸盐的方法，其中由铬矿，碱化合物和任选的倾斜材料组成的混合物在第一阶段中被加热在不超过5体积的气氛中。氧气的氧气温度在1000-400℃之间，第二阶段在900℃至110℃的较低温度下被氧化，同时供给含有至少50％氧气的气氛。

8. 发明授权

US5127999A Process for the preparation of alkali metal dichromates and chromic acid by electrolysis 失效
标题翻译：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
申请人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block , Hans D. Pinter
发明人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block , Hans D. Pinter
IPC分类号： C25B1/14 , C01G37/14 , C25B1/22 , C25B1/28
CPC分类号： C25B1/22 , C25B1/28
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。

9. 发明授权

US5094729A Processes for the preparation of alkali metal dichromates and chromic acid 失效
标题翻译：制备碱金属二铬酸盐和铬酸的方法
公开(公告)号：US5094729A
公开(公告)日：1992-03-10
申请号：US659435
申请日：1991-02-22
申请人： Helmut Klotz , Hans D. Pinter , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
发明人： Helmut Klotz , Hans D. Pinter , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
IPC分类号： C01G37/14 , C25B1/14 , C25B1/22
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。

10. 发明授权

US5250274A Process for the production of sodium dichromate 失效
标题翻译：生产重铬酸钠的方法
公开(公告)号：US5250274A
公开(公告)日：1993-10-05
申请号：US824682
申请日：1992-01-21
申请人： Norbert Lonhoff , Bernhard Spreckelmeyer , Hans-Dieter Block , Rainer Weber , Jost Halstenberg , Bernd Rosenow
发明人： Norbert Lonhoff , Bernhard Spreckelmeyer , Hans-Dieter Block , Rainer Weber , Jost Halstenberg , Bernd Rosenow
IPC分类号： C01G37/14 , C01G37/00
CPC分类号： C01G37/14
摘要： The invention relates to a process for the production of sodium dichromate and sodium dichromate solutions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace clinker obtained with water or an aqueous chromate-containing solution, adjustment of the pH to from 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution being obtained, conversion of the monochromate ions of this solution into dichromate ions by acidification and crystallization of sodium dichromate by concentration of this solution, characterized in that the acidification is carried out with carbon dioxide under pressure with removal of sodium hydrogen carbonate, the remaining solution is then very largely freed from sodium monochromate by cooling to a temperature below 10.degree. C. and filtration, any monochromate ions still present in the remaining solution are converted into dichromate ions by addition of an acid and the sodium monochromate filtered off is added to the sodium monochromate solution before conversion with carbon dioxide into a sodium dichromate solution.
摘要翻译：本发明涉及一种通过在碱性条件下对铬矿进行氧化焙烧生产重铬酸钠和重铬酸钠溶液的方法，用水或含铬酸盐水溶液浸取得到的炉渣，将pH调节至7至 9.5，通过过滤除去不溶性成分，得到单色钠溶液，通过浓缩该溶液酸化并重结晶重铬酸钠，将该溶液的单色离子转化为重铬酸根离子，其特征在于酸化是用二氧化碳在压力下除去碳酸氢钠，剩余的溶液然后通过冷却到低于10℃的温度非常大地从单色钠中除去并过滤，剩余溶液中仍然存在的任何单色离子被转化成重铬酸根离子加入酸和过滤的单色钠在将二氧化碳转化成重铬酸钠溶液之前，将f加入到单色钠溶液中。

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