[KRAUSE HARTMUT, SEIFERT GERD, HARTMUT KRAUSE ET GERD SEIFERT] DE;

[Stefan Dinsch, Jurgen Winkler, Gerd Hoppner, Holger Seifert] DE,,Schipkau;DE,,Schwarzheide;DE,,Schwarzheide;DE,,Bohmte; The invention relates to a process for preparing polyether alcohols by catalytic addition of alkylene oxides onto a starter substance mixture comprising water-soluble H-functional starter substances which are solid at room temperature, alcohols which are liquid at the reaction temperature and water using alkali metal hydroxides and/or alkaline earth metal hydroxides as catalysts, wherein the amount of water is from 1.0 to 6.0% by weight, based on the weight of the starter substance mixture, and the starter substance mixture comprises no amine constituents.

[Gerd Dirscherl, Rainer Goettfert, Bernd Meyer, Jean-Pierre Seifert] DE,,Munich;DE,,Munich;DE,,Munich;US,OR,Hillsborough; A device for generating a pseudorandom sequence of numbers includes a feedforward coupler, which has a plurality of memory units, and a feedback coupler connected between an input and an output of the feedforward coupler. The feedback coupler includes a changeable feedback characteristic and is embodied to change the feedback characteristic depending on a state of a memory unit of the plurality of memory units of the feedforward coupler.

[Prescher Gunter(Hanau,DE), Schreyer Gerd(Hanau,DE), Weiberg Otto(Neu-Isenburg,DE), Wirthwein Rolf(Hanau,DE), Waldmann Helmut(Leverkusen,DE), Seifert Hermann(Cologne,DE), Schwerdtel Wulf(Leverkusen,DE), Swodenk Wolfgang(Odenthal,DE)] Process for continuous production of propylene oxide (FIG. 1) from propylene and aqueous hydrogen peroxide. The aqueous hydrogen peroxide is first reacted with propionic acid in the presence of acid catalyst to form perpropionic acid (1). The perpropionic acid is taken up by extraction in benzene (5 , 12), and following drying of the benzene solution (16), the perpropionic acid in the solution is reacted with propylene (18) for oxidation of the propylene to propylene oxide and conversion of the perpropionic acid back to propionic acid. The reaction mixture is worked up to separate propylene oxide, propionic acid and benzene (25, 27, 31, 33), and the latter two are recycled. In the benzene extraction (5, 12), an aqueous raffinate (7) is formed containing hydrogen peroxide and acid catalyst. Water is removed from the aqueous raffinate (8) and the concentrate is recycled to the propionic acid reactor. Make-up hydrogen peroxide can be added to the aqueous raffinate before the removal of water.

[Seifert, Heinz, Eckel, Hans-Gerd, Dr.] DE,D-69469 Weinheim,Höhnerweg 2-4;

[Goedecke, Ralf, Dr., Hofen, Willi, Seifert, Hermann, Dr., Siekmann, Gerd, Dr.] DE,51368 Leverkusen,;DE,D-60311 Frankfurt,Weissfrauenstrasse 9;

[Töpfer, Gottfried, Friedel, Gisela, Seifert, Andreas, Funke, Udo, Labus, Dieter, Lutze, Gerd, Schmidt, Lothar, Dornheim, Günter] DE,D-01855 Sebnitz,Götzingerstrasse 17;

[DR SEIFERT GERD W ING] DE

[DIRSCHERL GERD, HEWEL KARL-HARALD, JANSSEN NORBERT, RUPING STEFAN, SEIFERT JEAN-PIERRE, BRUECKLMAYR FRANZ-JOSEF]

[GOEDECKE RALF DR ING DR, HOFEN WILLI, SEIFERT HERMANN DIPL CHEM DR, SIEKMANN GERD DIPL ING] ;