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1. 发明专利

JP2001212458A CATALYST FOR SELECTIVELY OXIDIZING CARBON MONOXIDE IN REFORMING GAS 失效
公开(公告)号：JP2001212458A
公开(公告)日：2001-08-07
申请号：JP2000027783
申请日：2000-02-04
申请人： TANAKA PRECIOUS METAL IND , MATSUSHITA ELECTRIC WORKS LTD
发明人： ICHIISHI TOMOSHI , KAGAWA MASARU , MIZOBUCHI MANABU , HASHIMOTO NOBORU , KINUKAWA KENSAKU
IPC分类号： C01B3/38 , B01J23/46 , B01J32/00 , C10K3/04 , H01M8/06
摘要： PROBLEM TO BE SOLVED: To produce a catalyst for selectively oxidizing carbon monoxide, with which an amount of carbon monoxide in a reforming gas can be reduced by selectively oxidizing it and excellent utilization efficiency of fuel and power generation efficiency can be realized. SOLUTION: This catalyst, which is used for selectively oxidizing carbon monoxide in the reforming gas by using oxygen gas, is obtained by depositing ruthenium and platinum on a porous carrier at the weight ratio (Ru/Pt) of 0.1-9.5 so that the ruthenium and/or platinum are localized in a layer having 100 μm or shallower depth under the outer surface of the porous carrier. The catalyst can be obtained by depositing ruthenium and platinum on α-alumina carrier.

2. 发明专利

JP2001106535A PREPARATION METHOD OF HEXAMMINEIRIDIUM NITRATE SOLUTION 失效
公开(公告)号：JP2001106535A
公开(公告)日：2001-04-17
申请号：JP28901899
申请日：1999-10-12
申请人： TANAKA PRECIOUS METAL IND
发明人： ICHIISHI TOMOSHI , SATO AYAKO
IPC分类号： C01G55/00
摘要： PROBLEM TO BE SOLVED: To prepare a stable hexammineiridium nitrate solution low in impurities by extremely decreasing chlorine ions so that reaction products over the whole preparation steps can be handled in liquid states and all operations can be easily automated. SOLUTION: Excess ammonia water is added to an acidic solution of iridium (III) chloride and reacted with each other under pressure by heating to synthesize a hexammineiridium (III) chloride solution. The obtained solution is made to be in a weakly alkaline state by heating, which is then brought into contact with an anion exchange resin. Nitric acid is added to the solution thus prepared to obtain the objective solution.

3. 发明专利

JPH04180801A CONTINUOUS OPERATION OF SOLVENT EXTRACTION 失效
公开(公告)号：JPH04180801A
公开(公告)日：1992-06-29
申请号：JP30987990
申请日：1990-11-15
申请人： TANAKA PRECIOUS METAL IND
发明人： OKUDA AKIHIKO , ICHIISHI TOMOSHI
IPC分类号： B01D11/04
摘要： PURPOSE:To ensure that continuous solvent extraction can be performed by taking out a mixture of oil and water containing a sediment generated in an oil and water interface in a settlement tank of a mixer settler, from the settlement tank, then filtering said mixture continuously using a filtration assistant, and circulating filtrate through a device. CONSTITUTION:A mixture of oil and water containing a sediment generated in the oil and water interface of a settlement tank for a mixer settler which is an extraction device, is taken out of the settlement tank at a ratio of about (5-1)/10 times a liquid amount sent to a next-stage mixer settler. Next, the mixture of oil and water containing said sediment is continuously filtered with the help of a filter using a filtration assistant containing ashless pulp and activated carbon with a particulate size of 1 to 100mum at a weight ratio of 1:10 to 10:1. Then the filtrate is circulated in the mixer settler. As a result, it is possible to enhance extraction efficiency, separation efficiency and contact efficiency and thereby make possible the continuous performance of solvent extraction.

4. 发明专利

JPH03285030A METHOD FOR RECOVERING AND REFINING RHODIUM 失效
公开(公告)号：JPH03285030A
公开(公告)日：1991-12-16
申请号：JP8357190
申请日：1990-03-30
申请人： TANAKA PRECIOUS METAL IND
发明人： ICHIISHI TOMOSHI , SHIBAZAKI TAKUO
IPC分类号： C22B11/00
摘要： PURPOSE:To simply recover low concn. Rh at a high recovering rate and high purity by adding SnCl2 and CuCl2 to a rhodium-hydrochloric acid soln. having specified hydrochloric acid concn. and absorbing Rh by dialkyl sulfide- impregnated resin. CONSTITUTION:Hydrochloric acid is added to a rhodium-hydrochloric acid soln. including base metals and having low Rh concn. to regulate the hydrochloric acid concn. to 1 to 6 N. Next, SnCl2 and CuCl2 are added to this soln. The amounts of the SnCl2 and CuCl2 to be added are preferably regulated to 10 to 50 times respectively, by molar ratio, to Rh. After that, this soln. is brought into contact with porous resin impregnated with preferably >=30wt.% dialkyl sulfide to adsorb Rh. Next, this porous resin adsorbed with Rh is washed by dilute hydrochloric acid of 0.5 to 3 N. to remove Sn, Cu or the like and is thereafter baked at about 800 deg.C. The obtd. rhodium oxide is reduced by a hydrogen gas, is thereafter mixed with NaCl, in which a Cl2 gas is blown, and chlorination is executed at 800 to 950 deg.C for >= one hr. In this way, high purity Rh can be obtd. at approximately 100% recovering rate in the shape of soluble sodium salt of chlorhodic acid.

5. 发明专利

JPH03249143A METHOD FOR SEPARATING AND RECOVERING RHODIUM 失效
公开(公告)号：JPH03249143A
公开(公告)日：1991-11-07
申请号：JP4826790
申请日：1990-02-28
申请人： TANAKA PRECIOUS METAL IND
发明人： NISHIMURA YAMAJI , SANO MAKOTO , ICHIISHI TOMOSHI , OKUDA AKIHIKO
IPC分类号： C22B11/00
摘要： PURPOSE:To nearly perfectly separate and recover Rh by adding bivalent tin halide and copper halide to an Rh-containing hydrochloric acid solution and using dialkylsulfide to which higher alcohol is added as an extracting agent. CONSTITUTION:The hydrochloric acid concentration of a hydrochloric acid solution of Rh containing base metals is regulated to 0.5-12N, and bivalent tin halide and copper halide are added by the amounts 1.5-12 times Rh and 1.5-12 times Rh by mole ratio, respectively. Subsequently, Rh is extracted by using an organic solvent in which dialkylsulfide is used as an extracting agent and higher alcohol is added as a modifier. The organic solvent phase after Rh extraction is cleaned with 0.5-1N dilute hydrochloric acid to elute tin and copper. Then, Rh is precipitated in the form of sulfide, e.g. by blowing hydrogen sulfide into the organic solvent phase after tin and copper elution. The above precipitate is separated by filtration and heated and recovered in the form of metallic Rh. By this method, a recovery rate of >=99% can be attained.

6. 发明专利

JP2001017861A SELECTIVE OXIDIZING CATALYST OF CARBON MONOXIDE IN MODIFIED GAS 失效
公开(公告)号：JP2001017861A
公开(公告)日：2001-01-23
申请号：JP18990799
申请日：1999-07-05
申请人： TANAKA PRECIOUS METAL IND
发明人： ICHIISHI TOMOSHI , KAGAWA MASARU
IPC分类号： C01B3/38 , B01J23/46 , H01M8/06 , H01M8/10
摘要： PROBLEM TO BE SOLVED: To provide a selective oxidizing catalyst capable of selectively oxidizing carbon monoxide in modified gas to reduce the same and capable of realizing good fuel utilization efficiency or power generating efficiency. SOLUTION: A catalyst is used for selectively oxidizing carbon monoxide in modified gas by oxygen gas and constituted by supporting ruthenium or ruthenium and platinum on a porous carrier. Ruthenium or ruthenium and platinum are locally present within a thickness range of 100 μm from the outer surface of the porous carrier and may be supported on an α-alumina carrier and have a particle size of 5-200 Å.

7. 发明专利

JPH04292422A PRODUCTION OF RHODIUM NITRATE SOLUTION 失效
公开(公告)号：JPH04292422A
公开(公告)日：1992-10-16
申请号：JP8187391
申请日：1991-03-20
申请人： TANAKA PRECIOUS METAL IND , TOYOTA MOTOR CORP
发明人： ICHIISHI TOMOSHI , ITOU HISANORI
IPC分类号： B01J23/46 , C01G55/00
摘要： PURPOSE:To produce rhodium nitrate having improved supporting efficiency on a carrier for the production of a catalyst compared with a rhodium nitrate produced by conventional process comprising the dissolution of rhodium black in hot concentrated sulfuric acid, adjustment of pH of the solution and dissolution of the precipitated rhodium hydroxide in nitric acid. CONSTITUTION:In the production of rhodium nitrate solution by the reaction of rhodium hydroxide with nitric acid, a mixture of said rhodium hydroxide and nitric acid is concentrated by heating. The thermal concentration of the mixture of rhodium hydroxide and nitric acid accelerates the conversion of a compound assumed to be formed at the initial stage of the reaction into rhodium nitrate and enables the production of rhodium nitrate solution having high purity. The supporting efficiency of the rhodium nitrate on an inorganic carrier can be improved up to about 99%.

8. 发明专利

JPH04110428A METHOD FOR REGENERATING EXTRACTANT 失效
公开(公告)号：JPH04110428A
公开(公告)日：1992-04-10
申请号：JP22898990
申请日：1990-08-30
申请人： TANAKA PRECIOUS METAL IND
发明人： ICHIISHI TOMOSHI , OKUDA AKIHIKO
IPC分类号： C22B11/00
摘要： PURPOSE:To effectively utilize tin by bringing an org. solvent contg. a dialkyl sulfide into contact with a hydrochloric acid soln. added with bivalent tin, then cleaning the org. phase with specified dil. hydrochloric acid to transfer the tin in the org. phase to the hydrochloric acid phase and adding a reducing agent to obtain tin powder which is reutilized. CONSTITUTION:Palladium is extracted from a soln. of palladium in hydrochloric acid contg. platinum and a base metal such as tin with an org. solvent contg. a dialkyl sulfide. In this case, the bivalent tin is previously brought into contact with 6-12N hydrochloric acid contg. 5-200g/l of bivalent tin and an org. solvent contg. a dialkyl sulfide, and then the org. solvent layer is cleaned with 0.3-1N hydrochloric acid and separated. The tin contained in the separated dil. hydrochloric acid is reduced to form the tin powder which is filtered off and the tin powder is again dissolved in hydrochloric acid to obtain a soln. of bivalent tin which is reused. Besides, SBH is used as the tin reducing agent, and the tin is reduced by diaphragm electrolysis.

9. 发明专利

JPH0499232A METHOD FOR EXTRACTING PALLADIUM 失效
公开(公告)号：JPH0499232A
公开(公告)日：1992-03-31
申请号：JP21339390
申请日：1990-08-10
申请人： TANAKA PRECIOUS METAL IND
发明人： OKUDA AKIHIKO , ICHIISHI TOMOSHI
IPC分类号： C22B11/00
摘要： PURPOSE:To efficiently separate Pd by extracting Pd from a Pd-contg. soln. with an org. solvent contg. a dialkyl sulfide and successively cleaning the extract solvent phase with hydrochloric acid of specified concn. and dil. hydrochloric acid. CONSTITUTION:Palladium is extracted from a palladium-contg. soln. with an org. solvent contg. a dialkyl sulfide, the org. solvent phase is cleaned by 1-3N hydrochloric acid and then by = about 0.3N, and the normality for extraction is preferably controlled to about 1-10N.

10. 发明专利

JPH0480335A METHOD FOR SEPARATING TIN IN SOLUTION OF PLATINUM GROUP METAL 失效
公开(公告)号：JPH0480335A
公开(公告)日：1992-03-13
申请号：JP19549090
申请日：1990-07-24
申请人： TANAKA PRECIOUS METAL IND
发明人： ICHIISHI TOMOSHI , OKUDA AKIHIKO
IPC分类号： C22B11/00
摘要： PURPOSE:To recover platinum group metals at a high recovering rate at low cost by mixing the hydrochloric acid of platinum group metals including tin with an organic solvent including alkyl phosphonic monoester, stirring this mixture and extracting the tin into the organic solvent layer. CONSTITUTION:The hydrocloric acid soln. of platinum group metals including tin and subjected to the regulation of acidity is mixed with an organic solvent including alkyl phosphonic monoester which is not mingled with water, and this mixture is stirred. In this way, the tin is extracted into the organic solvent layer. Next, the hydrochloric acid soln. layer of the platinum metals is separated from the above organic solvent layer. In this way, the tin in the platinum group metals is separated. By this method, the platinum group metals can simply be isolated in a short time from the mixture or mixed soln. of the platinum group metals and tin. Furthermore, the organic solvent layer with the above extracted tin is washed by a hydrochloric acid having high concn. of >=9 normal, by which the tin can be extracted and separated into the above hydrocloric acid soln. Moreover, as the above platinum group metals, platinum, palladium, rhodium or the like can be used, and as the alkyl phosphonic monoester, 2-ethylhexyl phosphonic monoacid-2-ethylhexyl can be used.

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