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    METHOD FOR CONTROLLING FLOW RESISTANCE OF DIAPHRAGM
    1.
    发明专利
    METHOD FOR CONTROLLING FLOW RESISTANCE OF DIAPHRAGM 失效

    公开(公告)号：JPH10273792A

    公开(公告)日：1998-10-13

    申请号：JP33406897

    申请日：1997-12-04

    Applicant: BASF AG

    Inventor： FRIEDRICH HOLGER DR ,  HOPPE KLAUS-DIETER DR ,  LEUTNER BERND DR ,  SCHLAEFER DIETER DR ,  HECKY KURT

    IPC: C25B13/08 ,  C25B13/00 ,  C25B15/00

    Abstract: PROBLEM TO BE SOLVED: To control the flow resistance of a diaphragm in a desired range with good reliability by treating the diaphragm based on a fibrous material with a fluorine-contg. dispersion during or after the production of the diaphragm. SOLUTION: A diluent, sodium chloride, sodium hydroxide, sterilizer, surfactant, antifoaming agent, etc., are incorporated into a powdered and cleaned fiber to obtain a fibrous aq. slurry. A dispersion contg. a fluorine-contg. component and a soln. contg. the precursor of ZrO2 , as required, are added to the slurry while agitating to produce a recirculating diaphragm. Meanwhile, the diaphragm treatment is conducted during electrolysis, preferably during alkali chloride electrolysis. The amt. of the fluorine-contg. component to be used and incorporated in the dispersion is preferably controlled to 0.1 to 30 wt.% of the fibrous material in the diaphragm, and the fluorine-contg. component used in the diaphragm should be present at 30 to 500 g/m with respect to the area of the diaphragm.

    5.
    发明专利
    未知

    公开(公告)号：DE19650316A1

    公开(公告)日：1998-06-10

    申请号：DE19650316

    申请日：1996-12-04

    Applicant: BASF AG

    Inventor： FRIEDRICH HOLGER DR ,  HOPPE KLAUS-DIETER DR ,  LEUTNER BERND DR ,  SCHLAEFER DIETER DR ,  HECKY KURT

    IPC: C25B13/08 ,  C25B13/00 ,  C25B15/00 ,  C25B13/04

    Abstract: Modification of the cross-flow resistance of a diaphragm based on fibrous material comprises treating the diaphragm, during or after manufacture, with a dispersion of a component (I) containing fluorine and optionally a solution containing a zirconium dioxide (ZrO2) precursor. Preferably treatment is carried out during electrolysis. The amount of (I) used is 0.1-30 wt.% w.r.t. the fibrous material of the diaphragm and the amount applied is 30-500 g/m diaphragm surface area.

    7.
    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.

    9.
    发明专利
    未知

    公开(公告)号：DE3925424A1

    公开(公告)日：1991-02-07

    申请号：DE3925424

    申请日：1989-08-01

    Applicant: BASF AG

    Inventor： LEUTNER BERND DR ,  HOPPE KLAUS-DIETER DR ,  BEVER PAUL DR ,  KRAUME MATTHIAS DR

    IPC: B01D53/50

    Abstract: To reduce the oxidation rates of sulphite/bisulphite-containing solutions in gas-liquid scrubbers for SO2 separation from gases, antioxidants are added to the solutions in an amount of 0.01 to 20 mmol per hour and per square metre of mass transfer area. These antioxidants may be polyaminoaromatics and/or polyhydroxyaromatics and/or (poly)amino(poly)hydroxyaromatics, ascorbic acid and/or dehydroascorbic acid.

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