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    PRODUCTION OF ACETAL
    7.
    发明专利
    PRODUCTION OF ACETAL 失效

    公开(公告)号：JPH11217346A

    公开(公告)日：1999-08-10

    申请号：JP1894998

    申请日：1998-01-30

    Applicant: AGENCY IND SCIENCE TECHN ,  SUMITOMO CHEMICAL CO

    Inventor： SUZUKI TOMOYUKI ,  OKADA AKIHIKO ,  SAKO TAKESHI

    IPC: C07C41/50 ,  C07C43/303

    Abstract: PROBLEM TO BE SOLVED: To obtain an acetal by a simple and inexpensive method without requiring a catalyst, by reacting a carbonyl group-containing organic compound with a lower alcohol under conditions to make the carbonyl group-containing organic compound and the lower alcohol in a supercritical state. SOLUTION: (A) A carbonyl group-containing organic compound a compound of the formula [R1 and R2 are each H or a (substituted) hydrocarbyl or R1 and R2 are mutually bonded partially to form a cyclic structure] such as a ketone, e.g. acetone or the like or an aldehyde, e.g. acetaldehyde or the like} is reacted with (B) a lower alcohol [a monohydric lower alcohol of the formula R3 -OH (R3 is a 1-10C hydrocarbyl) or a dihydric lower alcohol such as ethylene glycol or the like] preferably in the presence of (C) an inert medium such as carbon dioxide or the like under conditions to make the carbonyl group- containing organic compound and/or the lower alcohol (and/or the inert medium) in a supercritical state.

    METHOD FOR DETOXICATE POLYCHLORINATED BIPHENYL BY SUPERCRITICAL WATER
    8.
    发明专利
    METHOD FOR DETOXICATE POLYCHLORINATED BIPHENYL BY SUPERCRITICAL WATER 失效

    公开(公告)号：JPH10225632A

    公开(公告)日：1998-08-25

    申请号：JP11596697

    申请日：1997-05-07

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  OTAKE KATSUTO ,  OKANO MAKOTO

    IPC: A62D3/20 ,  A62D3/36 ,  A62D3/38 ,  A62D101/22 ,  B01J3/00 ,  B01J19/00 ,  C07C39/04 ,  A62D3/00

    Abstract: PROBLEM TO BE SOLVED: To detoxicate polychlorinated biphenyl by decomposing it with supercritical water alone, supercritical water admixed with alkali or supercritical water admixed with alkali and an oxidizing agent. SOLUTION: About 50-150 weight units of water, based on one weight unit of PCB, 50-150 weight units of water and 1-5 weight units of such an alkali as sodium hydroxide or 50-150 weight units of water, 2-20 weight units of an oxidizing agent such as hydrogen peroxide and 1-5 weight units of an alkali such as sodium hydroxide are filled in a reactor and heated above the critical temp. of water in a heating furnace. The reaction pressure is adjusted in accordance with the weight of water filled in the reactor, and the reaction time is controlled to 5-60min. Oxygen, air, etc., are used as the oxidizing agent as well as hydrogen peroxide. Sodium carbonate is used as the alkali besides sodium hydroxide. Consequently, the high reaction temp. and long reaction time are not needed to make polychlorinated biphenyl harmless without causing the resynthesis of PCB.

    RECOVERY OF MONOMER FROM AROMATIC POLYESTER
    9.
    发明专利
    RECOVERY OF MONOMER FROM AROMATIC POLYESTER 失效

    公开(公告)号：JPH09249597A

    公开(公告)日：1997-09-22

    申请号：JP5562596

    申请日：1996-03-13

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  OTAKE KATSUTO

    IPC: C08J11/02 ,  C07B37/06 ,  C07C27/02 ,  C07C31/20 ,  C07C67/475 ,  C07C69/76 ,  C07C69/82 ,  C08J11/24

    Abstract: PROBLEM TO BE SOLVED: To decompose an aromatic polyester into an aromatic dihydric carboxylic acid in a form of methyl ester and a dihydric alcohol in a short time and recover these monomers in a high yield by reacting the aromatic polyester with a supercritical methanol. SOLUTION: An aromatic polyester (e.g. polyethylene terephthalate) is reacted with a supercritical methanol to provide dimethyl aromatic dihydric carboxylic acid and a dihydric alcohol. The reaction is preferably carried out by packing the aromatic polyester and methanol into a reactor and heating the reactor under supercritical conditions of methanol. The supercritical conditions are preferably 523-653K deg. temperature and 5 to 25MP pressure. Methanol is preferably used in a ratio of 20-70mol based on 1mol aromatic dihydric carboxylic aid contained in the aromatic polyester. The aromatic dihydric carboxylic acid dimethyl ester and the dihydric alcohol can be recovered from the reaction product in high purity from a method such as distillation or crystallization.

    SEPARATION AND PURIFICATION OF POLYCYCLIC AROMATIC COMPOUND USING SUPER-CRITICAL FLUID
    10.
    发明专利
    SEPARATION AND PURIFICATION OF POLYCYCLIC AROMATIC COMPOUND USING SUPER-CRITICAL FLUID 失效

    公开(公告)号：JPH03287550A

    公开(公告)日：1991-12-18

    申请号：JP8873890

    申请日：1990-04-03

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： SAKO TAKESHI ,  SATO SHINJI ,  SUGATA TAKESHI ,  NAKAZAWA NOBUAKI ,  YAMANE SUMIYO

    IPC: C07C7/10 ,  C07C7/14 ,  C07C15/20

    Abstract: PURPOSE:To safely, inexpensively and simply separate a polycyclic aromatic compound in a energy-saving state from a mixture such as petroleum refined oil or coal tar with supercritical carbon dioxide as a extraction and crystallization solvent. CONSTITUTION:A raw material mixture is charged into an extraction tank 7 and super critical carbon dioxide is fed into the extraction tank 7 through a high pressure pump 2 and a pre-heating coil 5 to extract the mixture with the super critical carbon dioxide. The temperature and pressure of the extraction tank 7 are controlled with an air constant temperature bath and a back pressure valve 3. After the extraction the super critical fluid containing the mixture is fed from the constant temperature tank 10 into a crystallization tank 12 maintained at a prescribed temperature and only the objective component in the mixture is deposited. The super critical fluid containing the solutes in the crystallization tank is substituted with the pure super critical fluid and subsequently the pressure in the tank is reduced to the atmospheric pressure to recover the component. Since the process can be operated at a relatively low temperature, the pyrolysis and polymerization of the target substance can be prevented.

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