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Study of Photo Polymerization and Flocculation Effect of Cationic Polyacrylamide

Author: ZhangDongJie
Tutor: NieRongChun
School: Anhui University of Technology
Course: Chemical processes
Keywords: Cationic polyacrylamide Photopolymerization Intrinsic viscosity Cationic degree Flocculant
CLC: X703.5
Type: Master's thesis
Year: 2010
Downloads: 30
Quote: 0
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Abstract


China is one of the shortage of water resources and serious pollution to protect the limited water resources, sewage treatment has gradually become the core of China's environmental protection field. Water-soluble cationic polyacrylamide (CPAM) as an effective polymer flocculant, is widely used in the fields of water treatment, paper, mineral processing, coal washing. Domestic the CPAM of research, production levels are still far behind foreign countries. Using the photoinitiated polymerization system by aqueous solution radical copolymerization of initiator acrylamide (acrylamide monomer is polymerized to give Cationic referred to as AM) monomer with methyl acryloyloxyethyl trimethyl ammonium chloride (referred to as DMC) amide-P (AM-DMC). The simple synthesis conditions, easy to control, low cost, no pollution, using a wide range of industrial production. Studied by single factor experiment and L9 (34) orthogonal experiment P (AM-DMC) light trigger conditions of the polymerization process. Optimized process conditions: monomer concentration of 32% (mass concentration), n (DMC) / n (AM) monomer ratio 1:6, the amount of initiator 40 μl of initiation temperature is 25 ℃ , triggering time of 90min, pH value of 6.0, was 2% urea. Obtained under the condition P (AM-DMC) intrinsic viscosity of 705ml / g, the cationic degree of 13.79%. The experiment on the remaining factors are optimized, the mole ratio of P (AM-DMC) obtained under different conditions cationic degree AM monomer residues, respectively, were determined. The results show that the cationic degree and Theoretical cationic degree of the synthesis of P (AM-DMC) measured are relatively close to the relatively high rate of conversion of the monomers in the polymerization process of DMC; residual amount measurement results showed that the amount of residual monomer polymerization product AM were less than 0.050%, the polymer is substantially non-toxic. The orthogonal optimal conditions P (AM-DMC), infrared spectroscopy structural characterization results show that the product as AM monomer DMC monomer in the copolymerization product. The synthesized product the flocculation experiment results show that the slime water: light transmission rate of the intrinsic viscosity and cationic degree of flocculation experiments influential. Under certain conditions, the greater the intrinsic viscosity number, the greater the light transmittance; greater cationic degree, the greater the light transmittance. As the monomer ratio n (DMC) / n (AM) to the intrinsic viscosity and the role of the cationic degree of P (AM-DMC) is opposite, the intrinsic viscosity and the influence of the cationic degree of transmittance are most good value, considering both select monomer ratio n (DMC) / n (AM) is 1:6. Its product light transmission rate of up to 93.7%, compared to French goods, little difference between the flocculation effect, to meet the domestic market demand. [22] Table [20] Reference [60]

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Additives
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