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
A novel polycation electrolyte was synthesized by quaternizing polyvinyl alcohol(PVA) with (3-chloro-2-hydroxypropyl)-trimethylammonium chloride (CHTMAC) and using KOH as catalyst.The product was named as quaternized ...A novel polycation electrolyte was synthesized by quaternizing polyvinyl alcohol(PVA) with (3-chloro-2-hydroxypropyl)-trimethylammonium chloride (CHTMAC) and using KOH as catalyst.The product was named as quaternized PVA(QAPVA).The factors affecting the quaternization reaction were investigated and optimized.The degree of substitutions of QAPVA increased from 1.0% to 6.7%.QAPVA exhibited higher glass transition temperature.The conductivity of QAPVA aqueous solution showed direct proportional relationship with QAPVA concentration.PVA and QAPVA were further prepared into the dense membranes and observed membrane surface morphology.It was found that the surface of PVA membrane was flat, whereas the surface of QAPVA membrane took on many spherical tubes.Furthermore, the QAPVA membrane showed permeation flux of 250 g·m -2·h -1 and separation factor of 1540 when dealing with water/ethanol system [containing 95.4%(mass)ethanol] at 75℃.QAPVA was further compounded with phosphatized anionic PVA(PAPVA)to prepare a new polyelectrolyte complex and thereby utilize the new complex to separate water/ethanol[containing 95.4%(mass)ethanol].The results indicated that the complex had permeation flux of 380 g·m -2·h -1 and separation factor of 2250 for water/ethanol system.展开更多
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.
文摘A novel polycation electrolyte was synthesized by quaternizing polyvinyl alcohol(PVA) with (3-chloro-2-hydroxypropyl)-trimethylammonium chloride (CHTMAC) and using KOH as catalyst.The product was named as quaternized PVA(QAPVA).The factors affecting the quaternization reaction were investigated and optimized.The degree of substitutions of QAPVA increased from 1.0% to 6.7%.QAPVA exhibited higher glass transition temperature.The conductivity of QAPVA aqueous solution showed direct proportional relationship with QAPVA concentration.PVA and QAPVA were further prepared into the dense membranes and observed membrane surface morphology.It was found that the surface of PVA membrane was flat, whereas the surface of QAPVA membrane took on many spherical tubes.Furthermore, the QAPVA membrane showed permeation flux of 250 g·m -2·h -1 and separation factor of 1540 when dealing with water/ethanol system [containing 95.4%(mass)ethanol] at 75℃.QAPVA was further compounded with phosphatized anionic PVA(PAPVA)to prepare a new polyelectrolyte complex and thereby utilize the new complex to separate water/ethanol[containing 95.4%(mass)ethanol].The results indicated that the complex had permeation flux of 380 g·m -2·h -1 and separation factor of 2250 for water/ethanol system.
