中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

57 records (took 0.023 seconds)

    Process for the preparation of 3-keto-glutaric acid by carboxylation of acetone in glime
    1.
    发明授权
    Process for the preparation of 3-keto-glutaric acid by carboxylation of acetone in glime 失效
    通过乙酰胆碱羧化制备3-酮乙酸的方法

    公开(公告)号：US3912778A

    公开(公告)日：1975-10-14

    申请号：US47872474

    申请日：1974-06-12

    Applicant: MONTEDISON SPA

    Inventor： ALNERI ENZO ,  BOTTACCIO GIORGIO ,  CARLETTI VITTORIO ,  LANA GIULIO

    IPC: C07C59/347 ,  C07C51/00 ,  C07C51/15 ,  C07C59/265 ,  C07C67/00 ,  C07C55/12

    CPC classification number: C07C51/15 ,  Y02P20/582 ,  C07C59/347

    Abstract: Process for the preparation of an alkali metal salt of 3-ketoglutaric acid by carboxylation of acetone with an alkali metal phenate in the presence of a glime solvent-alkyl ethers of (poly)-ethylene-glycols. Phenol may be added and the reaction mass degassed of CO2 by applying vacuum. Unreacted acetone and excess phenol may be removed from the reaction mass and recycled. Water may be added to the reaction mass to facilitate separation by filtration of solid alkali-metal-salt of 3-keto-glutaric acid in the reaction mass. The filtrate may be reconstituted by the addition of alkali metal hydroxide. Acidifying the alkali metal salt 3-keto-glutaric acid produces 3-keto-glutaric acid. The alkali metal salt of 3-keto-glutaric acid may be converted to citric acid by reaction with hydrogen cyanide. The citric acid separation may be facilitated with a calcium or barium salt.

    Process for preparing beta-keto-acids
    2.
    发明授权
    Process for preparing beta-keto-acids 失效
    制备β-葡萄糖酸的方法

    公开(公告)号：US3557196A

    公开(公告)日：1971-01-19

    申请号：US3557196D

    申请日：1967-07-31

    Applicant: MONTEDISON SPA

    Inventor： BOTTACCIO GIORGIO ,  CHIUSOLI GIAN PAOLO

    IPC: C07C51/15 ,  C07C61/36

    CPC classification number: C07C51/15 ,  C07C59/84 ,  C07C59/347 ,  C07C59/195 ,  C07C59/205 ,  C07C59/353

    Abstract: DISCLOSED IS A PROCESS FOR PREPARING BETA-KETO-ACIDS HAVING THE FORMULA R-CO-CHR''-COOH FROM KETONES R-CO-CH2-R'' WHEREIN R AND R'' ARE HYDROCARBYLS CONTAINING 1 TO 10 C; R'' MAY BE H; R AND R'' TAKEN TOGETHER GIVE A CYCLOALKYLENE. THE PROCESS IS CHARACTERIZED IN THAT THE KETONE IS REACTED WITH CARBON DIOXIDE, IN THE PRESENCE OF ALKALINE SALTS OF PHENOLS IN AN INERT POLAR MEDIUM. THE ALKALINE PHENOL SALTS PREFERRED ARE THE LI, NA, K SALTS OF PHENOL, HYDROQUINONE AND THEIR METHYL HOMOLOGS. THE INERT POLAR MEDIUM IS PREFERABLY SELECTED FROM TRIALKYLPHOSPHINOXIDES, TRIALKYL-PHOSPHATES, HEXALKYL-PHOSPHOTRIAMIDES, DIALKYL-SULPHOXIDES, DIALKYLFORMAMIDES, DIALKYL-ACETAMIDES, TETRALKYLUREAS, PYRIDINE, DIALKYLETHERS OF MONO-, DI- AND TRI-ETHYLENEGLYCOL, WHEREIN ALKYL IS METHYL AND/OR ETHYL.

    PROCESS FOR THE PREPARATION OF PERFLUOROALKENE OXIDES
    3.
    发明专利
    PROCESS FOR THE PREPARATION OF PERFLUOROALKENE OXIDES 未知

    公开(公告)号：DE3474820D1

    公开(公告)日：1988-12-01

    申请号：DE3474820

    申请日：1984-11-28

    Applicant: MONTEDISON SPA

    Inventor： BORNENGO GIORGIO ,  CARLINI FILIPPO MARIA ,  PONTEVIVO MICHELE ,  BOTTACCIO GIORGIO

    IPC: B01J31/00 ,  C07B61/00 ,  C07D301/12 ,  C07D303/48

    Abstract: An improved process for the preparation of perfluoropropene oxide by the reaction of perfluoropropene with hydrogen peroxide in an aqueous alkaline medium is described. The improved process is characterized by carrying out the reaction in the presence of a phase-transfer catalyst selected from the group consisting of quaternary ammonium salts, phosphonium salts, and lipophilic complexing agents for cations, and by carrying out the addition of an aqueous solution of an inorganic base to the reaction mixture gradually so that a constant reaction temperature between -10 DEG C. and -60 DEG C. is maintained.

    10.
    发明专利
    未知

    公开(公告)号：AT334869B

    公开(公告)日：1977-02-10

    申请号：AT512374

    申请日：1974-06-20

    Applicant: MONTEDISON SPA

    Inventor： ALNERI ENZO ,  BOTTACCIO GIORGIO ,  CARLETTI VITTORIO ,  LANA GIULIO

    IPC: C07C59/347 ,  C07C51/00 ,  C07C51/15 ,  C07C59/265 ,  C07C67/00 ,  C07C59/33

    Abstract: 1414612 3-Keto-glutaric acid MONT EDISON SpA 12 June 1974 [20 June 1973] 26085/74 Heading C2C In the preparation of 3-keto-glutaric acid by carboxylation of acetone in the presence of an alkali metal phenate and an alkyl ether of a polyethylene glycol R-O-(-CH 2 -CH 2 -O-)- n R, where R is alkyl 1-4 C, and n an integer 1-10, the reaction mixture is degassed from carbon dioxide dissolved and/or complexed with the alkali metal phenate by the addition of at least a stoichiometric quantity of phenol, under vacuum. The aqueous solution is acidified and extracted with diethyl ether to obtain the acid. Tetrapolyethylene glycol in which n is 4 and the R is methyl, is preferred. Citric acid may be prepared by cyanuration of the sodium salt, hydrolysis of the cyanhydrin and neutralization followed by extraction and crystallization.

Patent Agency Ranking