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1. (WO1998051623) FILTER AID FOR CLAY PROCESSING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/051623 International Application No.: PCT/US1998/009105
Publication Date: 19.11.1998 International Filing Date: 04.05.1998
Chapter 2 Demand Filed: 17.11.1998
IPC:
C02F 1/54 (2006.01) ,C02F 1/56 (2006.01)
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
52
by flocculation or precipitation of suspended impurities
54
using organic material
C CHEMISTRY; METALLURGY
02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1
Treatment of water, waste water, or sewage
52
by flocculation or precipitation of suspended impurities
54
using organic material
56
Macromolecular compounds
Applicants:
ENGELHARD CORPORATION [US/US]; 101 Wood Avenue P.O. Box 770 Iselin, NJ 08830-0770, US
Inventors:
WILLIS, Mitchell, J.; US
BEHL, Sanjay; FR
YOUNG, Raymond, H.; US
Agent:
MILLER, Stephen, I. ; Engelhard Corporation 101 Wood Avenue P.O. Box 770 Iselin, NJ 08830-0770, US
Priority Data:
08/857,65016.05.1997US
09/070,68130.04.1998US
Title (EN) FILTER AID FOR CLAY PROCESSING
(FR) ADJUVANT DE FILTRATION POUR LE TRAITEMENT DE L'ARGILE
Abstract:
(EN) A process for filtering kaolin clay slurries in the presence of a filter aid which increases the percent solids in the filter cake, decreases the product solids in the waste filtrate, increases the rate of filtration, and yet does not interfere with redispersal of the filter cake after filtration. The process utilizes high molecular weight, highly anionic polyacrylic acid homopolymers or copolymers, or water soluble salts thereof, as filter aids for thickening and dewatering kaolin clay slurries. The flocculated clay may be redispersed after the separation process by normal means, such as the addition of low molecular weight anionic polymers with mixing.
(FR) Procédé servant à filtrer des pâtes de kaolin en présence d'un adjuvant de filtration qui augmente le pourcentage de solides dans le gâteau de filtration, diminue la teneur en solides du filtrat de déchets, augmente la vitesse de filtration et, cependant, ne joue aucun rôle dans la redispersion du gâteau de filtre après la filtration. Ce procédé met en application des homopolymères ou des copolymères d'acide polyacrylique extrêmement anioniques à poids moléculaire élevé, ou leurs sels solubles dans l'eau, en tant qu'adjuvants de filtration servant à épaissir et à déshydrater les pâtes de kaolin. L'argile floculée peut être redispersée après le processus de séparation par des moyens normaux, tels que l'apport au mélange de polymères anioniques à faible poids moléculaire.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
CN1261331AU1998072843