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    21.
    发明专利
    未知

    公开(公告)号：DE19746404A1

    公开(公告)日：1999-04-22

    申请号：DE19746404

    申请日：1997-10-21

    Applicant: BASF AG

    Inventor： FRIEDRICH HOLGER DR ,  BROECKEL ULRICH DR ,  SCHLAEFER DIETER DR ,  HOPPE KLAUS-DIETER DR ,  HECKY KURT ,  PALM PETER

    IPC: D01D5/24 ,  D01F1/10 ,  D01F6/12 ,  D01F6/62 ,  D04H1/42 ,  D04H1/60 ,  D04H11/00 ,  D01F8/06 ,  C08K3/20

    Abstract: Composite fibers (I) are prepared by heating a mixture of a PTFE or PTFE-copolymer-dispersion or powder with a fine particulate inorganic material and a fiber forming material with stirring such that the PTFE or PTFE copolymer becomes capable of flow but does not decompose and the dispersing agent is removed (in the case of a dispersion) and shearing the mixture in a mixer having a Froude number of more than 1. An Independent claim is included for a process for the production of a diaphragm by addition of (I) to a solution containing water and a thickening agent; filtering of the mixture with suction over a porous support to layer the composite fiber (I); drying of the coated porous support and heating at 90-390 degrees C.

    23.
    发明专利
    未知

    公开(公告)号：DE59600938D1

    公开(公告)日：1999-01-21

    申请号：DE59600938

    申请日：1996-05-23

    Applicant: BASF AG

    Inventor： KROENER RUDI DR ,  LEUTNER BERND DR ,  SCHNEIDER HANS-MICHAEL DR ,  FRIEDRICH HOLGER DR ,  HECKY KURT ,  SCHLAEFER DIETER DR ,  STEINER WOLFGANG DR

    IPC: C25B13/00 ,  C25B15/00

    Abstract: Regenerating plastic diaphragms comprises mixing a soln. of mineral acid (I) with a corrosion inhibitor (II) and passing the mixt. through the diaphragm for 0.1-84 (pref. 1-72, esp. pref. 2-24) hrs. at 0-100 (pref. 40-80, esp. pref. 50-70) degrees C. Also claimed are plastic diaphragms obtd. by this process. (I) consists at least partly, pref. entirely, of HCl in a concn. of 0.3-20 (pref. 2-10) wt%, pref. contg. NaCl in a concn. up to the satn. pt., pref. up to 250 g/l. Pref. soln. (I) also contains 500-5000 ppm Cu and/or Fe cpds., esp. Cu(II) and/or Fe(III) salts. The mixt. contains 0.005-5 (pref. 0.05-0.5) wt% (II). Component (II) contains alkynol(s), esp. an alkyne-diol, pref. mixed with 1-25 wt% amine, esp. hexamethylenetetramine (HMTA), ethylhexylamine or diethylhexylamine, and/or 0.1-3 wt% surfactant, esp. a quat. ammonium salt.

    24.
    发明专利
    未知

    公开(公告)号：DE19710449A1

    公开(公告)日：1998-09-17

    申请号：DE19710449

    申请日：1997-03-13

    Applicant: BASF AG

    Inventor： SCHLAEFER DIETER DR ,  MAUS MICHAEL DR ,  RAULS MATTHIAS DR ,  BAUMANN DIETER

    IPC: C01D1/30 ,  C01D1/28

    Abstract: Production of crystalline NaOH . 3.5H2O, involves crystallising NaOH.3.5H2O from an aqueous NaOH solution oversaturated with NaOH . 3.5H2O, and removing the crystals using a mechanical solid/liquid separator. The solid/liquid separation occurs under conditions in which crystalline NaOH.3.5H2O can be liberated from the lye residues; the NaCl content of the crystalline NaOH . 3.5H2O being ≤ 100 mg per kg.

    26.
    发明专利
    未知

    公开(公告)号：DE19519921A1

    公开(公告)日：1996-12-05

    申请号：DE19519921

    申请日：1995-05-31

    Applicant: BASF AG

    Inventor： KROENER RUDI DR ,  LEUTNER BERND DR ,  SCHNEIDER HANS-MICHAEL DR ,  FRIEDRICH HOLGER DR ,  HECKY KURT ,  SCHLAEFER DIETER DR ,  STEINER WOLFGANG DR

    IPC: C25B13/00 ,  C25B15/00

    Abstract: Regenerating plastic diaphragms comprises mixing a soln. of mineral acid (I) with a corrosion inhibitor (II) and passing the mixt. through the diaphragm for 0.1-84 (pref. 1-72, esp. pref. 2-24) hrs. at 0-100 (pref. 40-80, esp. pref. 50-70) degrees C. Also claimed are plastic diaphragms obtd. by this process. (I) consists at least partly, pref. entirely, of HCl in a concn. of 0.3-20 (pref. 2-10) wt%, pref. contg. NaCl in a concn. up to the satn. pt., pref. up to 250 g/l. Pref. soln. (I) also contains 500-5000 ppm Cu and/or Fe cpds., esp. Cu(II) and/or Fe(III) salts. The mixt. contains 0.005-5 (pref. 0.05-0.5) wt% (II). Component (II) contains alkynol(s), esp. an alkyne-diol, pref. mixed with 1-25 wt% amine, esp. hexamethylenetetramine (HMTA), ethylhexylamine or diethylhexylamine, and/or 0.1-3 wt% surfactant, esp. a quat. ammonium salt.

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