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    METHOD FOR DISSOLVING METAL
    31.
    发明专利
    METHOD FOR DISSOLVING METAL 失效

    公开(公告)号：JPH01294830A

    公开(公告)日：1989-11-28

    申请号：JP12285288

    申请日：1988-05-19

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： NAKAO YUKIMICHI ,  KAERIYAMA KYOJI ,  YAMAUCHI AIZO

    IPC: C22B3/04 ,  C22B3/16 ,  C23F1/10

    Abstract: PURPOSE:To safely dissolve and recover a metal with simple operation by using a cationic surfactant and halogentated hydrocarbons. CONSTITUTION:A cationic surfactant such as cetylpyridinium chloride is added to halogenated hydrocarbons (chlorine, bromine, and iodine are used as the halogen) such as benzyl chloride, the powders of a typical metal and a transition metal are further added and mixed, and the mixture is heated, if necessary. A halogen atom is given to the object metal from the halogenated hydrocarbons, and the metal halide is formed. The metal halide is converted to an ion pair of a metal polyhalide anion complex and an alkylammonium cation by the action of the cationic surfactant, and the metal is dissolved in the halogenated hydrocarbons. Accordingly, the operation is simplified, the metal is safely dissolved, and the metal can be recovered by such a process.

    SYNTHESIS OF POLYPHENYLENE ETHER OF HIGH DEGREE OF POLYMERIZATION
    32.
    发明专利
    SYNTHESIS OF POLYPHENYLENE ETHER OF HIGH DEGREE OF POLYMERIZATION 失效

    公开(公告)号：JPH01236237A

    公开(公告)日：1989-09-21

    申请号：JP6273288

    申请日：1988-03-16

    Applicant: AGENCY IND SCIENCE TECHN ,  FUJI POLYMER IND

    Inventor： NAKAO YUKIMICHI ,  KAERIYAMA KYOJI ,  YAMAUCHI AIZO ,  YOTSUYA TERUHISA ,  NINOMIYA YAMAHITO

    IPC: C08G65/44 ,  C08G65/38

    Abstract: PURPOSE:To produce the title polymer which has a small content of by-products and can be easily washed, by performing the polymerization of a 2,6- disubstituted phenol in the presence of a specified catalyst and oxygen or an oxygen-liberating substance in two stages in a specified solvent. CONSTITUTION:The polymerization of a 2,6-disubstituted phenol (e.g., 2,6- dimethylphenol) in the presence of oxygen or an oxygen-liberating substrate (e.g., air) by using an oxidative coupling reaction catalyst (e.g., cupurous chloride) is performed in a pyridine/aromatic compound (e.g., pyridine/benzene) mixed solvent by a two-stage reaction comprising a reaction at low temperature (desirably, a reaction performed for 30-60min under cooling with an ice bath) and a subsequent reaction at high temperature (desirably, a reaction at 40-60 deg.C). The use of said solvent makes it possible to synthesize a polyphenylene ether of a high degree of polymerization, and the two-stage reaction makes it possible to perform a washing operation easily because of a decreased content of by- products and to obtain a polyphenylene ether of a high degree of polymerization suitable as, especially, a material for an engineering plastic.

    PRODUCTION OF PRECIOUS METAL-ENCAPSULATING ZEOLITE
    35.
    发明专利
    PRODUCTION OF PRECIOUS METAL-ENCAPSULATING ZEOLITE 失效

    公开(公告)号：JP2000281333A

    公开(公告)日：2000-10-10

    申请号：JP9462699

    申请日：1999-04-01

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： KOBUCHI TAMOTSU ,  NAKAO YUKIMICHI ,  UCHISAWA JIYUNKO ,  KUSHIYAMA AKIRA

    IPC: B01J29/068 ,  B01J37/06 ,  C01B39/02

    Abstract: PROBLEM TO BE SOLVED: To obtain a zeolite having reaction selectivity by carrying a precious metal fine particle on a zeolite, treating the product with a precious metal dissolving agent composed of a quaternary ammonium halide capable of producing cation having a particle diameter equal to or above the pore diameter of the zeolite, a halogen single element and an organic solvent to selectively dissolving and removing the precious metal fine particle. SOLUTION: The noble metal dissolving agent is formed by dissolving 0.05-0.2 mol/l quaternary ammonium halide such as tetraethyl ammonium bromide, 0.025-0.1 mol/l halogen single element such as bromine per the total quantity of the precious metal dissolving agent in the organic solvent. The zeolite, on which the precious metal is carried by ion exchanging, is heated up to 400-500 deg.C at the rate of 0.1-1 deg.C/min, dried at the elevated temp. for 1-5 hr, fired and reduced by hydrogen. The zeolite is next treated with the precious metal dissolving agent to selectively dissolve and remove the precious metal fine particles carried on the surface of the zeolite to obtain the precious metal-encapsulating zeolite.

    PRODUCTION OF METAL COMPLEX
    36.
    发明专利
    PRODUCTION OF METAL COMPLEX 失效

    公开(公告)号：JPH09118654A

    公开(公告)日：1997-05-06

    申请号：JP27751395

    申请日：1995-10-25

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： NAKAO YUKIMICHI

    IPC: C07C209/00 ,  C07C209/68 ,  C07C211/63 ,  C07C211/65 ,  C07F1/00 ,  C07F3/00 ,  C07F15/00

    Abstract: PROBLEM TO BE SOLVED: To obtain a specific metal complex useful as a raw material for a catalyst and an organometallic compound, etc., by a one-stage reaction simply in high yield by bringing a halogen simple substance into contact with a tetraalkylammonium halide and a metal in an organic solvent. SOLUTION: Stoichiometric amounts of a halogen simple substance (B) and a tetraalkylammonium halide (C) are dissolved in an organic solvent (A) such as acetonitrile or benzene, further mixed with an excessive amount of a metal (D) such as gold, silver, palladium or zinc and reacted, for example, at the reflux temperature of the component A. The unreacted component D is removed from the prepared reaction mixture and then a metal complex consisting of a halogenated metal anion and a tetraalkylammonium cation [e.g. a complex of formula I (R to R are each an alkyl; MI is a metal having 2 coordination number and 1 valence; X is a halogen), formula II (MIII is a metal having 4 coordination number and 3 valence), formula III (MII is a metal having 4 coordination number and 2 valence) or formula IV] is separated.

    GOLD REFINING METHOD
    37.
    发明专利
    GOLD REFINING METHOD 失效

    公开(公告)号：JPH073351A

    公开(公告)日：1995-01-06

    申请号：JP17266693

    申请日：1993-06-18

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： NAKAO YUKIMICHI

    IPC: C22B9/10 ,  C22B3/20 ,  C22B7/00 ,  C22B11/06

    Abstract: PURPOSE:To refine gold by using safe and easily available chemicals and org. solvent and repeating heating and cooling. CONSTITUTION:A low-grade gold is dissolved at a specified temp. in an org. solvent of a combination having the ratio of one mol of a halide and >=0.5mol of an elementary halogen and in which at least one halogen contains iodine, the soln. is cooled to a temp. lower than the specified temp., and high-grade gold is deposited.

    PRODUCTION OF DIALKOXY-BIS@(3754/24)2-THIENYL)SILANE POLYMER
    38.
    发明专利
    PRODUCTION OF DIALKOXY-BIS@(3754/24)2-THIENYL)SILANE POLYMER 失效

    公开(公告)号：JPH0693089A

    公开(公告)日：1994-04-05

    申请号：JP26658692

    申请日：1992-09-09

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： TANIKI YASUSHI ,  MASUDA HIDEYUKI ,  NAKAO YUKIMICHI ,  KAERIYAMA KYOJI

    IPC: C08G61/12 ,  C08G61/10 ,  H01B1/12

    Abstract: PURPOSE:To simply obtain a polymer, having high electric conductivity, capable of carrying out oxidation and reduction and useful as an electrically conductive material, etc., for electronic parts by bringing a dialkoxy-bis (thienyl)silane into contact with iron chloride. CONSTITUTION:A dialkoxy-bis(2-thienyl)silane of formula I (R'' and R'' are alkyl) [e.g. diethoxybis(2-thienyl)silanel is brought into contact with iron(III) chloride to afford the objective polymer having a recurring unit of formula II. The reaction is preferably carried out at ambient temperature or a slightly heated temperature by dissolving the compound of formula I in an inert solvent and then adding iron(111) chloride powder to the resultant solution. This compound of formula I is preferably obtained by reacting a thiophene having the 2-position substituted with an alkali metal such as 2-lithiothiophene with a dihalodialkoxysilane used at 2:1 molar ratio in an inert solvent at -10 to $40 deg.C in an inert atmosphere.

    PEARL COLORED WITH FINE GRAINS OF GOLD AND MANUFACTURE OF THE SAME
    40.
    发明专利
    PEARL COLORED WITH FINE GRAINS OF GOLD AND MANUFACTURE OF THE SAME 失效

    公开(公告)号：JPH03159602A

    公开(公告)日：1991-07-09

    申请号：JP29950589

    申请日：1989-11-20

    Applicant: AGENCY IND SCIENCE TECHN ,  MORI IKUKO

    Inventor： MORI IKUKO ,  NAKAO YUKIMICHI

    IPC: A44C17/00

    Abstract: PURPOSE:To produce efficiently colored pearls each of which is covered with a coloring layer containing fine grains of gold by treating natural pearls in alkaline gold hydrosol containing cation surface active agent. CONSTITUTION:Gold hydrosol containing 0.001-0.1wt.% of gold is made by treating aqueous solution of chloroauric acid and the like with water soluble reducing agent such as sodium borohydride, sodium citrate and the like. Cation surface active agent is added to the gold hydrosol to change the charge of gold colloid grains to plus, whereby increasing attracting force with respect to the surface of pearls. Natural pearls are treated in the thus made gold hydrosol for a prescribed time, and then drawn up, washed by water and dried, by which colored pearls covered with coloring layer containing fine grains of gold are finally obtained. In this instance, it is preferable to treat pearls in the gold hydrosol of a temperature lower than about 40 deg.C for about 30 days.

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