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    PROCESS FOR PREPARING A PARTICULARLY PURE GLYCOLIC ACID
    1.
    发明专利
    PROCESS FOR PREPARING A PARTICULARLY PURE GLYCOLIC ACID 未知

    公开(公告)号：CA2194739A1

    公开(公告)日：1997-07-11

    申请号：CA2194739

    申请日：1997-01-09

    Applicant: HOECHST AG

    Inventor： EBMEYER FRANK ,  HABERLEIN HARALD ,  MOHN HOLGER

    IPC: B01D61/44 ,  C07C51/367 ,  C07C51/42 ,  C07C59/06

    Abstract: The present invention relates to a process for preparing a particularly pure glycolic acid by saponification with chloroacetic acid with an excess of alkali metal hydroxide, with the resulting alkali metal chloride being filtered off, and the 20 to 70% strength by weight glycolic acid solution being subsequently subjected to anelectrodialysis at 20 to 40.degree.C and a cell voltage of 0.5 to 2.5 V per cell pair. The process of the invention permits optimum removal of sodium chloride and chloroacetic acid as necessary for preparing a particularly pure glycolic acid. Other organic acids, nitrogen compounds, aldehydes and salts are not produced in this process and thus do not affect the product quality.

    PROCESS FOR THE PREPARATION OF CAMPHENE BY THE REARRANGEMENTOF A-PINENE
    5.
    发明专利
    PROCESS FOR THE PREPARATION OF CAMPHENE BY THE REARRANGEMENTOF A-PINENE 未知

    公开(公告)号：CA2191300A1

    公开(公告)日：1997-05-28

    申请号：CA2191300

    申请日：1996-11-26

    Applicant: HOECHST AG

    Inventor： GSCHEIDMEIER MANFRED ,  HABERLEIN HARALD

    IPC: C07C5/31 ,  C07C5/29 ,  C07C13/40 ,  C07C13/43

    Abstract: A process for the preparation of camphene by the rearrangement of .alpha.-pinene in the presence of a titanium oxide hydrate catalyst under the action of heat, wherein .alpha.-pinene is refluxed until the content of .alpha.pinene in the reaction mixture is still at least 3% by weight, and the rearrangement is then brought to completion in a secondary reaction at a temperature below 160.degree.C. By carrying out the process in this way - refluxing to a relatively high residual content of .alpha.-pinene and performing a secondary reaction at a lower temperature - the formation of polymeric by-products is reduced. This process moreover increases the yield of camphene in that recycled tricyclene, concentrated in the distillation of the crude product, is partially rearranged to camphene or the formation of more tricyclene is reduced.

    PROCESS FOR PREPARING OXIRANE COMPOUNDS
    7.
    发明专利
    PROCESS FOR PREPARING OXIRANE COMPOUNDS 未知

    公开(公告)号：CA1064045A

    公开(公告)日：1979-10-09

    申请号：CA232468

    申请日：1975-07-29

    Applicant: HOECHST AG

    Inventor： HABERLEIN HARALD ,  KORBANKA HELMUT ,  NOWY GUNTHER

    IPC: C07D301/12

    Abstract: PROCESS FOR PREPARING OXIRANE COMPOUNDS Ethylenically unsaturated hydrocarbons having form 8 to 60 carbon atoms may be epoxidized with high yields by reaction with mixtures of acetic acid and hydrogen peroxide in the presence of liquid, inert, aliphatic chlorinated hydrocarbons ha ving from 1 to 3 carbon atoms, whereof at least one is present in the form of a -CCl3, -CHCl2 or C=Cl2 group.

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