中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

44 records (took 0.024 seconds)

    21.
    发明专利
    未知

    公开(公告)号：DE59008346D1

    公开(公告)日：1995-03-09

    申请号：DE59008346

    申请日：1990-10-05

    Applicant: HOECHST AG

    Inventor： FREYER WALTER DR ,  MILTENBERGER KARLHEINZ DR ,  SCHMIDT MANFRED

    IPC: C07C51/58 ,  C07C53/48

    Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.

    PROCESS FOR CONTINUOUS PRODUCING DICHLORO- OR TRICHLORO-ACETYL-CHLORIDE
    24.
    发明专利
    PROCESS FOR CONTINUOUS PRODUCING DICHLORO- OR TRICHLORO-ACETYL-CHLORIDE 未知

    公开(公告)号：HU906346D0

    公开(公告)日：1991-04-29

    申请号：HU634690

    申请日：1990-10-05

    Applicant: HOECHST AG

    Inventor： FREYER WALTER ,  MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED

    IPC: C07C51/58 ,  C07C53/48

    Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.

    25.
    发明专利
    未知

    公开(公告)号：NO892785L

    公开(公告)日：1990-01-08

    申请号：NO892785

    申请日：1989-07-05

    Applicant: HOECHST AG

    Inventor： MILLER DENNIS ,  SCHMIDT MANFRED ,  HALASZ SIGMAR-PETER VON ,  HOLST ARNO ,  PUSCH GUENTER ,  ROSENTHAL GERHARD

    IPC: C09K8/584 ,  C09K8/588 ,  C09K23/02 ,  C09K23/12 ,  C09K23/42 ,  B01F17/00 ,  E21B43/00

    Abstract: Aqueous surfactant compositions containing a surfactant mixture of a) 55 to 85% by weight of an alkanesulphonate, petroleumsulphonate, olefinsulphonate or alkylbenzenesulphonate having a mean molecular weight of 280-400 and b) 15 to 45% by weight of an ether sulphonate of the formula RO(AO)mA'SO3M where R is C6-C20-alkyl or a phenyl group which is substituted by one to three alkyl groups having a total of 6 to 20 carbon atoms, A is a C2H4 or C3H6 group or a mixture of the two groups, A' is -C2H4- or -C3H6-, m is a number of 3 to 25, and M is an alkali metal atom or ammonium. These surfactant mixtures are suitable for tertiary oil recovery in combination with specific salt-stable copolymers based on polyarylamide. They form stable solutions or dispersions with highly saline water.

    27.
    发明专利
    未知

    公开(公告)号：NO874426D0

    公开(公告)日：1987-10-23

    申请号：NO874426

    申请日：1987-10-23

    Applicant: HOECHST AG

    Inventor： SCHMIDT MANFRED ,  RUPP WALTER ,  SCHEIDER GERHART ,  KOHN EVA MARIA

    IPC: C07C309/04 ,  C07C309/09 ,  C09K8/584 ,  E21B43/22 ,  C07C ,  E21B43/00

    Abstract: Styrylaryloxy ether sulfonates of the formula in which either R1 denotes styryl and simultaneously R2 and R3 are identical or different and denote hydrogen or styryl, or R1 and R2 are nonidentical and each denote methyl or styryl and simultaneously R3 denotes hydrogen or styryl, x denotes a number from 2 to 20, and M denotes an ammonium or alkali metal cation. These compounds are suitable as surfactant auxiliaries in oil recovery.

    PROCESS FOR THE PREPARATION OF TRIPEPTIDES
    29.
    发明专利
    PROCESS FOR THE PREPARATION OF TRIPEPTIDES 未知

    公开(公告)号：CA1335493C

    公开(公告)日：1995-05-09

    申请号：CA614545

    申请日：1989-09-29

    Applicant: HOECHST AG

    Inventor： FLEMMING HANS-WOLFRAM ,  RUKWIED MANFRED ,  SCHMIDT MANFRED

    IPC: C12P21/02 ,  C07K1/08 ,  C07K1/113 ,  C07K5/08 ,  C07K5/097

    Abstract: A process for the preparation of tripeptides A process for the preparation of tripeptides of the general formula I U - A - B - C - OH I in which U denotes hydrogen or a urethane protective group and A, B and C denote amino acids, by reaction of a compound of the general formula II U' - B - OH II in which U' is a urethane protective group which can be eliminated by hydrogenolysis, with a compound of the general formula III H - C - OR III in which R denotes alkyl, by the PPA method, elimination of U', reaction of the resulting compound with a compound of the general formula IV H - B - C - OR IV by the PPA method and subsequent enzymatic elimination of R. The tripeptides are intermediates used in the synthesis of bioactive peptides.

Patent Agency Ranking