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    2.
    发明专利
    未知

    公开(公告)号：BRPI0413915A

    公开(公告)日：2006-10-24

    申请号：BRPI0413915

    申请日：2004-08-27

    Applicant: BASF AG

    Inventor： DYLLICK-BRENZINGER RAINER ,  SCHMID MARKUS ,  WEHRLE J RG ,  LORENZ KLAUS ,  BRUHNS STEFAN ,  SENGE MICHAEL

    IPC: B01D19/04 ,  B01J13/04

    Abstract: Emulsifier-free antifoams are obtainable by mixing a) from 80 to 99% by weight of at least one finely divided, virtually water-insoluble, inert solid with b) from 1 to 20% by weight of at least one hydrophobic, organic compound which has an antifoam action and is solid at room temperature in the absence of a solvent in a shear gradient such that the particle size of the compounds (b) which have an antifoam action is reduced to a mean particle size of from 0.5 to 15 mum, emulsifier-free oil-in-water dispersions of mixtures of (a) and (b) are prepared by mixing the component (a) in an amount of from 80 to 99% by weight with the compounds of component (b) in an amount of from 1 to 20% by weight in the absence of emulsifiers in an extruder or kneader in a manner such that the mean particle size of the component (b) in the mixture is brought to 0.5 to 15 mum, at up to 100° C., and emulsifying the mixture in water, and the oil-in-water dispersions thus obtainable are used as antifoams and/or deaerators for aqueous, disperse or nondisperse liquids, in particular as antifoams and/or deaerators in the paper industry, in the food industry and in wastewater treatment plants.

    9.
    发明专利
    未知

    公开(公告)号：DE50308661D1

    公开(公告)日：2008-01-03

    申请号：DE50308661

    申请日：2003-07-16

    Applicant: BASF AG

    Inventor： BONN JOHANN ,  LORENZ KLAUS ,  WEHRLE JOERG ,  MATZ MANFRED

    IPC: B01D19/04 ,  D21H21/12

    Abstract: A defoaming agent and/or deaerator for aqueous foamable media based on oil-in-water dispersions. The oil phase contains at least one compound from fatty alcohols, fatty acid monoglycerides, diglycerides, and triglycerides, fatty acid ester of fatty acids and monovalent to trivalent alcohols, 3-thiaalkane-1-ole, 3-thiaoxide alkane-1-ole, 3-thiadioxide-alkane-ole, and thiaalkane esters in combination with (i) at least one polyglycerine that is obtained by esterification of at least 20 percent of polyglycerine with 12 to 36 C carboxylic acid, and (ii) at least one bisamide consisting of ethylene diamine and 10 to 36 C atom carboxylic acids, while the aqueous phase thereof contains at least one stabilizer, water, and an optional thickener, for aqueous media that tend to foam. Also disclosed are methods of controlling foam by adding the dispersions to a process, particularly during cellulose boiling, cellulose washing, grinding of paper pulp, paper production, and dispersion of pigments used for paper production.

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