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    PRODUCTION OF LOWER ALKYL ESTER OF PYRUVIC ACID
    26.
    发明专利
    PRODUCTION OF LOWER ALKYL ESTER OF PYRUVIC ACID 失效

    公开(公告)号：JPH1180089A

    公开(公告)日：1999-03-23

    申请号：JP24086197

    申请日：1997-09-05

    Applicant: TORAY INDUSTRIES

    Inventor： ONO TAKAE ,  IMAMURA SHINZO

    IPC: C07C67/08 ,  C07C67/52 ,  C07C67/54 ,  C07C69/716

    Abstract: PROBLEM TO BE SOLVED: To produce the subject compound useful as a raw material for medicines and agrochemicals and cleaning agents or the like for producing electronic materials in good yield by neutralizing a mixture solution of a pyruvate with water, a lower alcohol and 1,2-dichloroethane, then heating the resultant mixture solution, cooling the heated solution, separating the formed crystal by filtration and azeotropically dehydrating the resultant system. SOLUTION: A mixture solution of an alkali metallic pyruvate (e.g. sodium pyruvate) with water in a molar amount of =0.7 based on the alkali metallic pyruvate (e.g. ethanol) and 1,2-dichloroethane in a weight of >=0.1 based on the alkali metallic pyruvate is neutralized with a mineral acid (e.g. sulfuric acid), then heated at 40 deg.C to a temperature below the boiling point of the mixture solution and subsequently cooled to

    PRODUCTION OF ETHYL PYRUVATE
    27.
    发明专利
    PRODUCTION OF ETHYL PYRUVATE 失效

    公开(公告)号：JPH1180088A

    公开(公告)日：1999-03-23

    申请号：JP24086097

    申请日：1997-09-05

    Applicant: TORAY INDUSTRIES

    Inventor： ONO TAKAE ,  IMAMURA SHINZO

    IPC: B01J27/02 ,  B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C69/716

    Abstract: PROBLEM TO BE SOLVED: To produce the subject compound useful as a raw material for medicines and agrochemicals and cleaning agents or the like for producing electronic materials in good yield by adding 1,2-dichloroethane to a reactional solution containing pyruvic acid, water, ethanol and a pyruvic acid ester and distilling off the components. SOLUTION: When pyruvic acid and ethanol are heated in the presence of an acidic catalyst to produce ethyl pyruvate, 1,2-dichloroethane in a weight of >=0.1 based on the pyruvic acid is added to a reactional solution containing the pyruvic acid, water, ethanol and the ethyl pyruvate and the resultant solution is heated to distill off the 1,2-dichloroethane, water, ethanol and ethyl pyruvate. The distillates are then cooled and the 1,2-dichloroethane layer separated from an aqueous layer is returned to a thermal reactor to thereby produce the objective ethyl pyruvate useful as a raw material for producing medicines and agrochemicals and cleaning agents or the like for producing electronic materials in good yield.

    PRODUCTION OF HIGH-PURITY LOWER ALKYL ESTER OF PYRUVIC ACID
    28.
    发明专利
    PRODUCTION OF HIGH-PURITY LOWER ALKYL ESTER OF PYRUVIC ACID 失效

    公开(公告)号：JPH1180087A

    公开(公告)日：1999-03-23

    申请号：JP24085997

    申请日：1997-09-05

    Applicant: TORAY INDUSTRIES

    Inventor： ONO TAKAE ,  IMAMURA SHINZO

    IPC: C07C67/54 ,  C07C67/62 ,  C07C69/716

    Abstract: PROBLEM TO BE SOLVED: To produce the subject compound useful as a raw material for medicines and agrochemicals, cleaning agents for producing electronic materials or the like in high yield by distilling and purifying a lower alkyl ester of pyruvic acid in the presence of an epoxy group-containing compound and a quaternary ammonium group-containing compound. SOLUTION: When a lower alkyl ester of pyruvic acid (e.g. methyl pyruvate) is distilled and purified, a compound having epoxy group (e.g. a bisphenol A type epoxy compound) and a compound having a quaternary ammonium group (e.g. triethylbenzylammonium chloride) and having a higher boiling point than that of the lower alkyl ester of the pyruvic acid under atmospheric pressure in respective weights of 0.001-0.2 based on the lower alkyl ester of the pyruvic acid are subjected to the distillation and purification thereof. Thereby, the objective high-purity lower alkyl ester of the pyruvic acid, useful as a raw material for producing medicines and agrochemicals and cleaning agents or the like for producing electronic materials without containing chloride ions is obtained.

    PRODUCTION OF PYRUVIC ACID LOWER ALKYL ESTER
    29.
    发明专利
    PRODUCTION OF PYRUVIC ACID LOWER ALKYL ESTER 失效

    公开(公告)号：JPH1059902A

    公开(公告)日：1998-03-03

    申请号：JP21886496

    申请日：1996-08-20

    Applicant: TORAY INDUSTRIES

    Inventor： ONO TAKAE ,  IMAMURA SHINZO

    IPC: C07C67/08 ,  C07B61/00 ,  C07C67/54 ,  C07C67/58 ,  C07C69/716

    Abstract: PROBLEM TO BE SOLVED: To produce a pyruvic acid lower alkyl ester from an aqueous solution of pyruvic acid. SOLUTION: A lower alcohol is added to an aqueous solution of pyruvic acid and heated, then the resultant solution of pyruvic acid and a pyruvic acid lower alkyl ester is mixed with an organic solvent azeotropic with water to remove water in the system, thus further the reaction is continued while adding a lower alcohol corresponding to remaining pyruvic acid and thionyl chloride.

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