公开(公告)号：JPH06157037A

公开(公告)日：1994-06-03

申请号：JP31180192

申请日：1992-11-20

Applicant: TOSOH CORP

Inventor： DOI MASAHARU ,  IWATA HIDEKAZU ,  MORI TAKASHI

IPC: C01G25/02

Abstract: PURPOSE:To provide highly pure zirconium oxide powder uniformly controlled in its composition and in its particle diameters and excellent in dispersibility. CONSTITUTION:The aqueous solution of a zirconium salt containing zirconium oxide hydrate, the aqueous solution of a stabilizer precursor, and an alkali aqueous solution are fed into a reaction tank, and brought into contact with each other, while maintaining the pH of the solution in the reaction tank at a substantially constant value. The produced precipitates are separated, dried and calcined.

公开(公告)号：JPH0629019A

公开(公告)日：1994-02-04

申请号：JP41171290

申请日：1990-12-19

Applicant: TOSOH CORP

Inventor： OKADA MASAKI ,  DOI MASAHARU ,  YOSHIDA SETSUO ,  MORI TAKASHI

IPC: H01M4/505 ,  H01M10/05 ,  H01M4/58 ,  H01M4/02 ,  H01M4/50 ,  H01M10/40

Abstract: PURPOSE:To provide a non-aqueous lithium secondary battery excellent in the cyclic characteristics by subjecting manganese dioxide having a certain specific surface area to an acid treatment, and using it to prepare the resultant manganese dioxide containing Li2MnO3 as intended. CONSTITUTION:To manufacture an intended manganese dioxide containing Li2MnO3 through a baking process for a mixture of manganese dioxide and lithium, a manganese dioxide is used as starting material which has gamma-type crystal structure with BET specific surface area ranging 150 to 500m /g and which is subjected to an acid treatment. Thereby granular growth is suppressed to form the resultant Li2MnO3-containing manganese dioxide which consists of particles of the sizes below 5mum, has a high rate of surface area, and is highly active in electrochemical terms. This material is used to a positive electrode while lithium or lithium alloy is used to a negative electrode, and a non- aqueous type electrolyte is used, and thereby a non-aqueous lithium secondary battery is achieved which excels in the cyclic characteristics.

公开(公告)号：JPH02174796A

公开(公告)日：1990-07-06

申请号：JP32764988

申请日：1988-12-27

Applicant: TOSOH CORP

Inventor： SAKAMOTO KENJI ,  HARADA TSUNEO ,  DOI MASAHARU ,  MORI TAKASHI

IPC: B01D61/44 ,  C07K1/14 ,  C07K5/06 ,  C07K5/075

Abstract: PURPOSE:To purify an aqueous solution of a dipeptide ester containing organic acids by supplying the solution to a treating chamber separated by an anion exchange membrane and a cation exchange membrane and treating under a specific condition, thereby easily removing the impurity organic acids in high efficiency. CONSTITUTION:An aqueous solution of a dipeptide ester containing organic acids as impurities is supplied to a treating chamber separated from the other chambers of an electrolytic cell with an anion exchange membrane and a cation exchange membrane at a linear flow rate of 5.0-50cm/sec and electrified with electrodes placed outside of the treating chamber to remove the organic acids from the treating chamber through the ion exchange membrane. Preferably, the aqueous solution of dipeptide ester is alpha-L-aspartyl-L-phenylalanine methyl ester solution and its pH is 4.0-7.0.

公开(公告)号：JPS62274086A

公开(公告)日：1987-11-28

申请号：JP11620886

申请日：1986-05-22

Applicant: TOSOH CORP

Inventor： MORI TAKASHI ,  DOI MASAHARU ,  FUKUDA KENICHI ,  KURANAI YASUHIRO

IPC: C25B3/00 ,  C25B9/00 ,  C25B9/08

Abstract: PURPOSE:To improve the durability of diaphragms in an electrolytic cell used to synthesize amino acid by an electrolytic ion substitution method and to develop an electrolytic anion substitution method by which superior efficiency is attained, by using F-contg. anion exchange membranes each having a specified structure as the diaphragms. CONSTITUTION:When amino acid is synthesized by an electrolytic anion substitution method using ion exchange membranes, an electrolytic cell 1 is divided into an anode chamber 6, an intermediate chamber 7 and a cathode chamber 8 with anion exchange membranes 2, 3, the anode 4 of Pt or the like and the cathode 5 of Fe or the like are placed in the anode and cathode chambers 6, 8, respectively, and hydrochloric acid and sodium hydroxide are fed to the anode and cathode chambers 6, 8, respectively. Electrolysis is then carried out at 50A/dm current density to obtain an amino acid soln. by the substitution of OH for Cl in the intermediate chamber 7. An F- contg. anion exchange membrane represented by formula I and having quat. ammonium groups represented by formula II or IV is used as the anion exchange membrane 2. An F-contg. anion exchange membrane represented by the formula I and having quat. ammonium groups represented by formula III is used as the anion exchange membrane 3.

公开(公告)号：JPH06183833A

公开(公告)日：1994-07-05

申请号：JP33616592

申请日：1992-12-16

Applicant: TOSOH CORP

Inventor： MATSUI KOJI ,  FUNAKOSHI HAJIME ,  DOI MASAHARU ,  YOSHIDA SETSUO ,  MORI TAKASHI

IPC: B02C17/20 ,  C04B35/48

Abstract: PURPOSE:To obtain a zirconia ball excellent in abrasion resistance. CONSTITUTION:This zirconia ball is composed of a zirconia sintered compact comprising 2-4.5mol.% yttria, 8-15mol.% ceria and 8-11mol.% magnesia or 5-15mol.% calcia and alumina and has =98% density based on the theoretical one. The zirconia ball can be obtained by forming raw material powder composed of dense primary or secondary particles having 6-23m /g BET specific surface area and burning the formed compact at 1200-1350 deg.C.

公开(公告)号：JPH0632615A

公开(公告)日：1994-02-08

申请号：JP21228292

申请日：1992-07-17

Applicant: TOSOH CORP

Inventor： MATSUI KOJI ,  UEMA TSUTOMU ,  DOI MASAHARU ,  MORI TAKASHI

IPC: C01G25/02 ,  C04B35/48

Abstract: PURPOSE:To obtain the subject zirconia having improved formability and sintering property by drying a hydrated zirconia gel containing a prescribed amount of an alkali metal based on ZrO2 and calcining the dried product at a specific temperature. CONSTITUTION:A hydrated zirconia sol is produced by adding a proper amount of a stabilizing agent such as Y2O3 to an aqueous solution of a zirconium salt such as zirconium oxychloride and hydrolyzing at the boiling temperature. The sol is incorporated with an aqueous solution of an alkali metal compound such as NaOH and the obtained suspension having pH of >=8 is filtered and washed with water until the pH of the filtrate reaches /g and high dispersibility.

公开(公告)号：JPH04206354A

公开(公告)日：1992-07-28

申请号：JP32994390

申请日：1990-11-30

Applicant: TOSOH CORP

Inventor： OKADA MASAKI ,  YOSHIDA SETSUO ,  DOI MASAHARU ,  MORI TAKASHI

IPC: H01M4/505 ,  C01G45/00 ,  H01M10/052

Abstract: PURPOSE:To constitute an nonaqueous lithium secondary battery having a large cycle discharge capacity by using, as a positive electrode, LiMn2O4 consisting of needle particles having corresponding diameters in which the short axis diameter, long axis diameter and height are specified. CONSTITUTION:LiMn2O4 consisting of needle particles having corresponding diameters of a short axis diameter not more than 5mum, a long axis diameter not more than 10mum, and a height not more than 5mum is mixed in a mortar, and the temperature is raised to bake it under air atmosphere. The obtained LiMn2O4, carbon powder of a conductive material, and polytetrafluoroethylene powder of a binder are mixed together, molded into a pellet, and used as a positive electrode. As a negative elellctrode 5, a lithium piece is used, and an electrolyte obtained by dissolving lithium perchlorate into a mixture of propylene carbonate and 1, 2-dimethoxyethane is impregnated in a separator 4 and used. Thus, a nonaqueous lithium secondary battery having a high cycle discharge capacity can be constituted.

公开(公告)号：JPH02270894A

公开(公告)日：1990-11-05

申请号：JP9185989

申请日：1989-04-13

Applicant: TOSOH CORP

Inventor： DOI MASAHARU ,  SAKAMOTO KENJI ,  HARADA TSUNEO ,  MORI TAKASHI

IPC: B01D61/44 ,  C07K1/14 ,  C07K5/06 ,  C07K5/075 ,  C25B3/00

Abstract: PURPOSE:To accomplish the title purification in an efficient, simple manner without lowering the yield by feeding a specific intermediate chamber with an aqueous solution of a dipeptide ester containing organic acids followed by energization to remove the organic acids. CONSTITUTION:(B) An aqueous solution of a dipeptide ester containing (A) organic acids is fed into an intermediate chamber partitioned from the other chambers of an electrolytic cell with a cation exchange membrane and an anion exchange one each made up of at least two layers differing in ion exchange capacity from each other, and an energization is made from electrodes set out of the intermediate chamber to remove the component A out of the intermediate chamber through the ion exchange membranes, thus accomplishing the purification of the component B. It is preferable that the component B be an aqueous solution of alpha-L-aspartyl-L-phenylalanine methyl ester and the pH of the aqueous solution 4.0-7.0.

公开(公告)号：JPS63270487A

公开(公告)日：1988-11-08

申请号：JP10182287

申请日：1987-04-27

Applicant: TOSOH CORP

Inventor： KURAUCHI YASUHIRO ,  DOI MASAHARU ,  MORI TAKASHI ,  FUKUDA KENICHI

IPC: C25B1/00 ,  C25B13/08

Abstract: PURPOSE:To efficiently carry out electrolytic anion substitution when anions are substd. for anions of a different kind in an aq. soln., by using a fluorine- contg. anion exchange membrane of a specified copolymer as an anion exchange membrane for the substitution. CONSTITUTION:A fluorine-contg. anion exchange membrane of a copolymer having repeating units represented by the formula is used as an anion exchange membrane for electrolysis with an ion exchange membrane. In the formula, X is F or CF3, (l) is 0 or an integer of 1-5, (m) is 0 or 1, (n) is an integer of 1-5, each of (p) and (q) is a positive number, p/q=2-16, each of R1-R3 is lower alkyl group, R1 and R2 may bond to each other to form a tetramethylene or pentamethylene chain, R4 is H atom or lower alkyl group, R3 and R4 may bond to each other to form an ethylene or trimethylene chain, Z is a negative ion and (a) is an integer of 2-10. The exchange capacity of the fluorine-contg. anion exchange membrane is regulated to about 0.1-3.0meq/g dry resin and the thickness to about 40-500mu.

公开(公告)号：JPS6342387A

公开(公告)日：1988-02-23

申请号：JP18418786

申请日：1986-08-07

Applicant: TOSOH CORP

Inventor： KURAUCHI YASUHIRO ,  MORI TAKASHI ,  FUKUDA KENICHI ,  DOI MASAHARU

IPC: C25B3/00 ,  B01J47/12 ,  C25B9/00 ,  C25B9/08 ,  C25B13/08

Abstract: PURPOSE:To efficiently substitute anions in an aq. soln. by other kind of anions by feeding the soln. to an electrode chamber formed with anion exchange membranes contg. fluoride obtd. by treating membranes of carboxylic ester represented by a prescribed formula and by carrying out ion substitution. CONSTITUTION:Anion exchange groups are introduced into membranes of carboxylic ester having repeating units represented by the formula (where X is F or CF3, l is 0 or an integer of 1-5, m is 0 or 1, n is an integer of 1-5, p/q=4-16 and R is alkyl) by acid or base treatment to obtain anion exchange membranes 2, 3 contg. fluorine. An aq. soln. contg. anions is fed to an electrode chamber formed with the exchange membranes 2, 3 and electrolytic ion substitution is carried out to substitute the anions in the soln. by other kind of anions.