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    41.
    发明专利
    未知

    公开(公告)号：DE50301943D1

    公开(公告)日：2006-01-19

    申请号：DE50301943

    申请日：2003-06-18

    Applicant: BASF AG

    Inventor： BOHRES EDWARD ,  FRANKE DIRK ,  STOESSER MICHAEL ,  RUPPEL RAIMUND ,  BAUM EVA ,  HARRE KATHRIN

    IPC: C08G65/12 ,  B01J27/26 ,  B01J37/03 ,  C08G18/48 ,  C08G65/26

    Abstract: The invention relates to a process for preparing polyether alcohols by addition of alkylene oxides onto H-functional starter substances using multimetal cyanide compounds as catalysts, wherein the multimetal cyanide compound is prepared by a process comprising the steps: a) adding a metal salt solution to a cyanometalate solution at a specific stirring power epsilon in the range from 0.05 to 10 W/l, preferably from 0.4 to 4 W/l, a temperature in the range from 0° C. to 100° C., preferably from 20° C. to 60° C., and an addition time of from 5 to 120 minutes, b) reducing the specific stirring power epsilon to a value in the range from 0.03 to 0.8 W/l and at the same time adding a surface-active agent, c) heating the solution while stirring at a specific stirring power epsilon of from 0.03 to 0.8 W/l, to a temperature of not more than 100° C., preferably in the range from 55° C. to 75° C., d) adding further metal salt solution while stirring at a specific stirring power epsilon of from 0.03 to 0.8 W/l, e) when the conductivity begins to drop, dispersing the solid, for example by stirring while increasing the specific stirring power epsilon to >0.7 W/l or by installation of a pumped circuit with an appropriate pump or by means of a high-speed stirrer, f) stirring at the specific stirring power epsilon of step e) until the conductivity or the pH remains constant, g) separating off the multimetal cyanide compound and washing it with water and, if desired, h) drying the catalyst.

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