中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

9 records (took 0.022 seconds)

    PRODUCTION OF TRIALKYLHYDROQUINONE
    6.
    发明专利
    PRODUCTION OF TRIALKYLHYDROQUINONE 失效

    公开(公告)号：JPS58210038A

    公开(公告)日：1983-12-07

    申请号：JP9307282

    申请日：1982-06-02

    Applicant: MITSUI PETROCHEMICAL IND

    Inventor： TANIGUCHI KATSUO ,  TANAKA MICHIO ,  IMAGAWA MASAO

    IPC: C07C37/16 ,  B01J21/00 ,  C07B61/00 ,  C07C27/00 ,  C07C37/00 ,  C07C39/08 ,  C07C67/00

    Abstract: PURPOSE:The isomerization of 4-alkoxy-2,6-dialkylphenol is effected only by bringing it into contact with a solid acid catalyst to permit high-yield production of the titled compound which is used as a synthetic intermediate of medicines such as vitamin E and additives for resins. CONSTITUTION:2-Alkoxy-2, 6-dialylphenol such as 4-methoxy-2, 6-dimethylphenol is brought into contact with a solid acid catalyst such as alumina, silica-alumina, or magnesia-titania under heating to give 2,3,6-trialkylhydroquinone. The above catalytic reaction is carried out in vapor phase, preferably in the temperature range from 300 to 400 deg.C at a space velocity of 0.01-5hr in an inert gas such as argon. The process can be effected in liquid phase as well.

    PRODUCTION OF CYCLIC CARBONATE
    7.
    发明专利
    PRODUCTION OF CYCLIC CARBONATE 失效

    公开(公告)号：JPS6426576A

    公开(公告)日：1989-01-27

    申请号：JP18098487

    申请日：1987-07-22

    Applicant: MITSUI PETROCHEMICAL IND

    Inventor： KISO YOSHIHISA ,  MATSUNAGA YUICHI ,  IMAGAWA MASAO

    IPC: C07D317/12 ,  B01J23/02 ,  B01J27/232 ,  B01J31/02 ,  B01J31/08 ,  C07B61/00 ,  C07D317/36 ,  C07D319/04 ,  C07D319/06 ,  C07D325/00

    Abstract: PURPOSE:To simply obtain the titled compound useful in various fields such as additives for specific ink, e.g. high speed recording ink jet or reaction solvent, by reacting a diol used as a raw material with a dialkylcarbonate using a basic catalyst as a catalyst. CONSTITUTION:A 1,3-diol or 1,2-diol which is used as a raw material is reacted with a dialkylcarbonate in the presence of a basic catalyst (preferably strongly basic substance) under ordinary pressure - pressure (normally 10atm.) at 60-180 deg.C and then preferably the resultant reaction mixture is subjected to heating and aging treatments under reduced pressure in the presence of a basic catalyst to provide the aimed compound. The dialkylcarbonate are used at a ratio of 0.1-10mol., preferably 1-2mol. to 1mol. diol. The basic catalyst is used at a ratio of preferably 0.001-0.005mol. to 1mol. diol.

    SEPARATION METHOD OF ALKYL GROUP-SUBSTITUTED HYDROQUINONE
    9.
    发明专利
    SEPARATION METHOD OF ALKYL GROUP-SUBSTITUTED HYDROQUINONE 失效

    公开(公告)号：JPS58140033A

    公开(公告)日：1983-08-19

    申请号：JP2118082

    申请日：1982-02-15

    Applicant: MITSUI PETROCHEMICAL IND

    Inventor： TANIGUCHI KATSUO ,  FUJIMOTO TADAAKI ,  IMAGAWA MASAO

    IPC: C07C37/72 ,  C07C27/00 ,  C07C39/08 ,  C07C67/00

    Abstract: PURPOSE:To separate a trialkylhydroquinone useful as an intermediate for medicines from a mixture of alkyl group-substituted hydroquinones containing mono-trialkylhydroquinones, by using a two-phase mixed solvent consisting of m-xylene and water. CONSTITUTION:A mixture of alkyl group-substituted hydroquinones containing mono-trialkylhydroquinones is brought into contact with a two-phase mixed solvent consisting of m-xylene and water to separate the phases. The trialkylhydroquinones are recovered from the oily phase, and mono-dialkylhydroquinones are recovered from the aqueous phase respectively. Preferably, the weight raio between the m-xylene and the water is 0.1-10, and the weight ratio between the m-xylene and the mixture of the alkyl-substituted hydroquinones is 10-100. The method will cause scarcely the loss due to the disappearance of the respective components in the contact treatment, and the large quantity of heat is not required in the separation as opposed to the distillation method.

Patent Agency Ranking