公开(公告)号：DE2327869A1

公开(公告)日：1975-02-20

申请号：DE2327869

申请日：1973-06-01

Applicant: BASF AG

Inventor： SRNA CHRISTIAN DR ,  BURKERT HANS DIPL CHEM DR ,  SCHENCK HANS-UWE DIPL CHEM DR

IPC: C02F1/54 ,  C02C3/00

Abstract: Dehydration of clear sludge, esp. industrial sludge, in presence of residual ash (I) from clear sludge combustion, as dehydration auxiliary, is accelerated by addn. of 1-100 (5-50) ppm., w. r. t. clea sludge wt., anionic polyelectrolytes, (II). Wt. ratio (I) : (II) is 250: 1 to 150000 : 1. Dry clear sludge can be burnt and recycled to process. Ash residues, not required for further sludge processing and dehydration, can be used as raw materials ror road surfacing, mortars and coatings. (I) and (II) act synergetically and their combined use can halve required concn. of (I) and reduce required concn. of (II) by 90%; and filtration can be completed in 0.5-2 hrs.

公开(公告)号：DE3213873A1

公开(公告)日：1983-10-27

申请号：DE3213873

申请日：1982-04-15

Applicant: BASF AG

Inventor： BURKERT HANS DIPL CHEM DR ,  BRUNNMUELLER FRITZ DIPL CHEM D ,  BEYER KARL-HEINZ DIPL CHEM DR ,  KROENER MICHAEL DIPL CHEM DR ,  MUELLER HANS DIPL CHEM DR

IPC: C08F8/00 ,  D21H17/34 ,  D21H17/45 ,  C02F11/14 ,  C02F1/56 ,  C08F8/12 ,  C08F126/02 ,  B01D21/01

Abstract: Sludges are flocculated by the addition of a polymer which is prepared by the homopolymerization of N-vinylformamide in the presence of a free-radical polymerization initiator to give a poly-N-vinylformamide, followed by hydrolysis of from 10 to 90% of the formyl groups in the poly-N-vinylformamide.

公开(公告)号：DE3135279A1

公开(公告)日：1983-03-24

申请号：DE3135279

申请日：1981-09-05

Applicant: BASF AG

Inventor： BURKERT HANS DIPL CHEM DR ,  HARTMANN JUERGEN DIPL CHEM DR ,  JUNG DIETMAR DIPL CHEM DR ,  HEIDE WILFRIED DIPL CHEM DR ,  HARTMANN HEINRICH DIPL CHEM DR ,  SPOOR HERBERT DIPL CHEM DR

IPC: C02F1/54 ,  C08F20/34 ,  D21H17/37 ,  D21H17/42 ,  D21H17/43 ,  D21H17/45 ,  C02F1/56 ,  B01D21/01 ,  C02F11/14

Abstract: Use of water-soluble homopolymers of di-C1- to C3-alkylaminoneopentyl (meth)acrylates in neutral or quaternary form and/or of water-soluble copolymers which contain at least 5% by weight of copolymerised di-C1- to C3-alkylaminoneopentyl (meth)acrylate in neutral or quaternary form and which each have a K value of 150 to 300, as flocculants for waste waters (effluents) and sludges.

公开(公告)号：DE2557325A1

公开(公告)日：1977-06-30

申请号：DE2557325

申请日：1975-12-19

Applicant: BASF AG

Inventor： BURKERT HANS DIPL CHEM DR ,  JUNG DIETMAR DIPL CHEM DR ,  SRNA CHRISTIAN DIPL CHEM DR

IPC: C08F6/00 ,  C08F6/10 ,  C08F120/56

Abstract: Drying of acrylmaide (co)polymers contg. water, or their aq. solns. by evaporation of the water in presence of 0.1-1 wt. % based on (co)polymer, of a water-soluble hydroxylamine. The water may be removed by any process e.g. or heated rolls, in a hot air fluidised bed or pref. by azeotropic distn. Drying of acrylamide polymers, or copolymers with (meth)acrylic acid and/or dialkylamino alkyl acrylates, contg. 40-100% acrylamide with mol. wt. 1-25 x 106. The (co)polymers mayb e made by soln., suspension or emulsion polymerisation, and may be highly concentrated or in dilute aq. soln. Degradation of the (co)polymers by heat, producing insoluble gels, is prevented by the hydroxylamine stabiliser.