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    Treating combustion gases containing sulfur- and carbon dioxides, e.g. from power stations, by two-stage scrubbing with aqueous calcium hydroxide or carbonate then e.g. amine or potassium hydroxide solution
    3.
    发明专利
    Treating combustion gases containing sulfur- and carbon dioxides, e.g. from power stations, by two-stage scrubbing with aqueous calcium hydroxide or carbonate then e.g. amine or potassium hydroxide solution 未知

    公开(公告)号：DE10340349A1

    公开(公告)日：2005-03-24

    申请号：DE10340349

    申请日：2003-09-02

    Applicant: BASF AG

    Inventor： WALLON ALEXANDER ,  ASPRION NORBERT ,  MECKL STEFAN

    IPC: B01D53/14 ,  B01D53/50 ,  B01D53/62 ,  B01D53/78

    Abstract: Treatment of combustion gases (I) containing sulfur dioxide (SO2) and carbon dioxide (CO2) comprises a first absorption stage (a), in which SO2 is removed by scrubbing with aqueous suspension of calcium hydroxide or calcium carbonate, followed by a second absorption stage (b) in which CO2 is removed by scrubbing with amine(s) (II) (optionally in aqueous solution), aqueous potassium hydroxide solution (optionally containing (II)) or aqueous aliphatic aminoacid alkali metal salt solution, the CO2-charged scrubbing liquid from (b) being regenerated and recycled. Treatment of combustion gases (I) containing sulfur dioxide (SO2) and carbon dioxide (CO2) as impurities involves: (1) an absorption stage (a), in which the gas is intimately contacted with a scrubbing liquid (A) comprising an aqueous suspension of calcium hydroxide or calcium carbonate, followed by separating the SO2-charged scrubbing liquid (A) and the remaining, non-absorbed part of (I); (2) an absorption stage (b), in which the non-absorbed part of (I) is intimately contacted with a scrubbing liquid (B) comprising a solution (b1) consisting of at least one amine compound (II) (optionally in aqueous solution), a solution (b2) consisting of water, potassium hydroxide and optionally (II) or a solution (b3) consisting of water and the alkali metal salt of an aliphatic aminoacid, followed by separating the CO2-charged scrubbing liquid (B) and the remaining, non-absorbed part of (I); and (3) regenerating the CO2-charged solution (B) and recycling it to absorption stage (b). (II) are selected from 4-12C aliphatic or cycloaliphatic amines; 4-12C alkanolamines; and cyclic amines consisting of 5-7 membered heterocycles consisting of 1 or 2 N atoms and 1 or 2 alkanediyl groups.

    Aqueous polyurethane dispersions
    5.
    发明专利
    Aqueous polyurethane dispersions 未知

    公开(公告)号：AU653649B2

    公开(公告)日：1994-10-06

    申请号：AU2834992

    申请日：1992-11-13

    Applicant: BASF AG

    Inventor： WALLON ALEXANDER ,  MAEMPEL LOTHAR ,  AUCHTER GERHARD ,  SEIBERT HORST

    IPC: C08L75/04 ,  C08G18/08 ,  C08G18/65 ,  C08L75/00 ,  C09J175/00 ,  C09J175/04 ,  C08G18/32 ,  C08L61/10 ,  C08L63/02 ,  C09J163/02 ,  C09J161/10

    Abstract: Aqueous dispersions containing a polyurethane and from 5 to 60% by weight, based on the polyurethane, of an adhesion-improving polymer, the polyurethane consisting essentially of (a) organic diisocyanates, (b) dihydroxy compounds which have a molecular weight of from more than 500 to 5,000 g/mol and contain no ionic groups or groups convertible into ionic groups, (c) compounds having one or two functional groups reactive toward isocyanate and at least one ionic group or group convertible into an ionic group and (d) compounds having at last 3 isocyante groups or at least 3 functional groups reactive toward isocyanate, (e) optionally compounds which differ from (c) and have two functional groups reactive toward isocyanate and a molecular weight of from 60 to 500 g/mol, the compounds (d) being used in amounts such that the functionality F of all components is from 2.01 to 2.5, and the polyurethane or a prepolymer thereof is prepared in a water-miscible solvent boiling below 100 DEG C. and, after addition of the adhesion-improving polymer, is dispersed in water.

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