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公开(公告)号：DE59702462D1
公开(公告)日：2000-11-16
申请号：DE59702462
申请日：1997-07-07
Applicant: BASF AG
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公开(公告)号：DE19918172A1
公开(公告)日：2000-10-26
申请号：DE19918172
申请日：1999-04-21
Applicant: BASF AG
Inventor： DIRKS BERND , LINHART FRIEDRICH
Abstract: Recovery of pigments from the waste water from paper coating operations comprises adding a water-soluble condensation product of dicyandiamide, HCHO, ammonium salts and optionally also urea so as to give a pigment-containing precipitate and then separating off the precipitate and re-dispersing it in water in the presence of a base.
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公开(公告)号：NO990078A
公开(公告)日：1999-01-08
申请号：NO990078
申请日：1999-01-08
Applicant: BASF AG
Inventor： DYLLICK-BRENZINGER RAINER , MEIXNER HUBERT , LINHART FRIEDRICH , M NCH DIETMAR , GERBER KLAUS-DIETER , DIRKS BERND , BAUMANN PETER
CPC classification number: D21H23/14 , D21H17/29 , D21H17/375 , D21H17/455 , D21H17/56 , D21H17/68
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公开(公告)号：CA2258569A1
公开(公告)日：1998-01-15
申请号：CA2258569
申请日：1997-07-07
Applicant: BASF AG
Inventor： M NCH DIETMAR , GERBER KLAUS-DIETER , BAUMANN PETER , DIRKS BERND , DYLLICK-BRENZINGER RAINER , MEIXNER HUBERT , LINHART FRIEDRICH
Abstract: The invention relates to a process for producing paper and cardboard by dehydration of pulps, forming sheets and drying said sheets. Polyethylene imines of a molar mass Mw of greater than 500 000 or polymers containing vinyl amine units and having a molar mass of 5000 to 3 million are added to the pulps and subsequently, polymers containing cationic polyacrylic amides or vinyl amine units are added to said pulps, the molar masses Mw of the polymers being at least 4 million in each case. The pulp is then subjected to at least one shearing stage and flocculates by addition of bentonite, colloidal silicic acid or clay.
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