Research And Application Of Synthesize Of Polyacrylamide By Aqueous Solution Polymerization

At first,this paper is on the basis of series of experiments.We research the homopolymerization of acrylamide,acrylamide homopolymerization of pilot tests,acrylamide and cationic monomer of binary and ternary copolymerization of cationic polyacrylamide,flocculation experiment.Specific studies are as follows:(1)In the method of aqueous solution polymerization,we use the composite initiator system,using acrylamide as raw materials to aggregated into polyacrylamide.We also studied the acrylamide monomer mass fraction,the azo initiator dosage,the REDOX mass fraction,the urea,dosage of sodium formate,and the influence of reaction temperature and time on the viscosity of polymer characteristic,by this way we synthesized a kind of intrinsic viscosity,solubility of polyacrylamide.According to our exploration of the process parameters,we enlarge pilot experiment was carried out,by a comparison of the performance of conversion,we know the difference,and put congress to make reaction polymerization is not easy to heat dissipation,leading to a characteristic viscosity decreased,therefore,in the large-scale industrialized production,we need to improve production technology and conditions,and then the higher molecular weight polyacrylamide is obtained.(2)In homopolymerization,on the basis of optimum process with base DMDAAC and DMC as cationic monomer,and AM by aqueous solution polymerization,respectively,obtained the characteristic viscosity of 10.59 dL/g P(DMC-AM)and characteristics of the highest viscosity of 7.2 dL/g P(DMDAAC-AM).The characteristic viscosity differences mainly reflects on the polymerization activity of high and low.Polymerization process respectively to study the influences of various factors on their characteristic viscosity,determine the optimum synthetic process,and has carried on the infrared and nuclear magnetic characterization,to their final product.(3)On the basis of binary cationic polymerization test,a ternary cationic polymerization experiment was carried out.On the basis of two monomers,which is DMDAAC and AM,respectively to join DMC and styrene(St)to aggregated experiment,we gained a good solvability,characteristic viscosity 10.26 dL/g of ternary cationic polyacrylamide P(DMDAAC-DMC-AM),and joined the polymerization of styrene experiment,because among the polymerization activitydiffers big,that didn't get the product of better viscosity.In the experiments,we analyzed the influence of various parameters on the ternary copolymerization,in order to use for reference for others to experiment.(4)We take waste water of jiangxi province pharmaceutical co.,LTD.,using the four kinds of cationic polyacrylamide,which was made by the laboratory,to flocculation process the changes of light transmittance and flocculating rate of such evaluation indexes as flocculation experiment,so the CPAM in waste water flocculation performance is recorded.Results show that with the increase of additive amount,the better flocculation performance,considering the economic factors,can use 6 g/L dosing quantity;On polymerization of 4 kinds of cationic polyacrylamide,found especially in P(DMC-AM)flocculation effect is better;Flocculation performance increases with the increase of intrinsic viscosity,the intrinsic viscosity of10.59 best flocculating rate of dL/g.Inorganic flocculant used alone can also improve the flocculation performance of sewage,from the experiment shows that better flocculation effect of polyaluminium chloride,dosage of 4 g/L.Compound with organic and inorganic flocculant used compared to the single use of flocculation performance increase to a certain extent,in the process of sewage treatment,found that inorganic flocculation increased dose helps to improve the flocculating rate.