The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period,...The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period, acceleration period and steady period. The accelerative increase period ranged in 3～17 days determines the incremental amount of gelling velocity and gel viscosity, and its gelling kinetics equation is η=η 0+kt 0.9(25 ℃). There are two factors which are the doses of water soluble phenol formaldehyde resin as crosslinker and the molecular weight of APAM affecting the gelling velocity at temperature 40～70 ℃, the former is the more prominent. The gelling reaction rate constant k could be controlled in 1 57～3 13 Pa·s/d 0.9 for reaction of 0 4% APAM solution with 0 2%～0 8% resol as crosslinker at reaction temperature 50 ℃ and the gel viscosity being reached to the maximum values of 16 2～29 0 Pa·s.展开更多
A cationic polyelectrolyte with a high density charge, its average molecular weight was 2.60×10 6 and cationic character reached 45%, adsorbed on the particles with the adsorption pattern of static electricity gr...A cationic polyelectrolyte with a high density charge, its average molecular weight was 2.60×10 6 and cationic character reached 45%, adsorbed on the particles with the adsorption pattern of static electricity gravitation between the cationic groups and the clay surface with negative charges. It could be neutralize the ζ potential of clay particle surface to 0 mV and keep with 0 mV, and make the capillary suction time of oily sludge reduce to 100～200 s and finally make it chemical destabilization, but also make the fine grains(diameter under 20 μm) be effectively flocculated and swept away. The flocculating reaction kinetics of cationic polyelectrolyte to solid particles of oily sludge was made certain as second order reactions.展开更多
文摘The kinetics of gellation reaction between amphoteric polyacrylamide(APAM) and water soluble phenol-formaldehyde resin has been studied. The whole gelation process could be divided into three periods:induction period, acceleration period and steady period. The accelerative increase period ranged in 3～17 days determines the incremental amount of gelling velocity and gel viscosity, and its gelling kinetics equation is η=η 0+kt 0.9(25 ℃). There are two factors which are the doses of water soluble phenol formaldehyde resin as crosslinker and the molecular weight of APAM affecting the gelling velocity at temperature 40～70 ℃, the former is the more prominent. The gelling reaction rate constant k could be controlled in 1 57～3 13 Pa·s/d 0.9 for reaction of 0 4% APAM solution with 0 2%～0 8% resol as crosslinker at reaction temperature 50 ℃ and the gel viscosity being reached to the maximum values of 16 2～29 0 Pa·s.
文摘A cationic polyelectrolyte with a high density charge, its average molecular weight was 2.60×10 6 and cationic character reached 45%, adsorbed on the particles with the adsorption pattern of static electricity gravitation between the cationic groups and the clay surface with negative charges. It could be neutralize the ζ potential of clay particle surface to 0 mV and keep with 0 mV, and make the capillary suction time of oily sludge reduce to 100～200 s and finally make it chemical destabilization, but also make the fine grains(diameter under 20 μm) be effectively flocculated and swept away. The flocculating reaction kinetics of cationic polyelectrolyte to solid particles of oily sludge was made certain as second order reactions.
