EP 0879252 A1 19981125 - PROCESSES FOR THE PRODUCTION OF POLYACRYLAMIDE PARTICLES
Title (en)
PROCESSES FOR THE PRODUCTION OF POLYACRYLAMIDE PARTICLES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON POLYACRYLAMID-TEILCHEN
Title (fr)
PROCEDES POUR LA PRODUCTION DE PARTICULES DE POLYACRYLAMIDE
Publication
Application
Priority
- GB 9700317 W 19970204
- GB 9602415 A 19960207
Abstract (en)
[origin: WO9729136A1] Processes are provided for production of substantially dry polyacrylamide powder in which levels of residual acrylamide monomer are significantly reduced. These processes are particularly suitable for use on an industrial or plant scale. One process comprises providing aqueous polyacrylamide gel particles contaminated with acrylamide monomer, applying amidase enzyme to the aqueous gel particles whilst they are at a temperature of from 50 to 95 DEG C and substantially immediately passing the aqueous gel particles to a drying stage and subjecting them in that stage to a temperature at least 60 DEG C. The final levels of residual acrylamide can be even further reduced with the introduction of a short holding stage of not more than 30 minutes at a temperature of 20 to 70 DEG C before passing the particles to drying.
IPC 1-7
IPC 8 full level
C08F 6/00 (2006.01); C08F 20/56 (2006.01)
CPC (source: EP)
C08F 6/006 (2013.01)
Citation (search report)
See references of WO 9729136A1
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE
DOCDB simple family (publication)
WO 9729136 A1 19970814; AU 1610997 A 19970828; BR 9707271 A 19990413; EP 0879252 A1 19981125; GB 9602415 D0 19960403; JP 2000504057 A 20000404; MX 9806357 A 19981031; NO 983613 D0 19980806; NO 983613 L 19981007; PL 328372 A1 19990118; ZA 971021 B 19980209
DOCDB simple family (application)
GB 9700317 W 19970204; AU 1610997 A 19970204; BR 9707271 A 19970204; EP 97902470 A 19970204; GB 9602415 A 19960207; JP 52827097 A 19970204; MX 9806357 A 19980806; NO 983613 A 19980806; PL 32837297 A 19970204; ZA 971021 A 19970207