Study On Production Process Of Pilot Scale And Flocculating Performance Of Cationic Polyacrylamide Flocculant

Acrylamide polymers are the names of acrylamide homopolymers andcopolymers of acrylamide with other monomers, and polymers which contain morethan50%acrylamide monomer structural unit are generally referred to aspolyacrylamide. Polyacrylamide and its derivatives, a new type of fine functionalpolymer products, play an important role in water-soluble polyelectrolyte. Moreover,cationic polyacrylamide is widely used as a kind of effective flocculant in the areas ofwater treatment, metallurgy, paper making and so on.By using a complex redox initiating system composed of a self-madedifunctional peroxide initiator, a reductive agent and a water-soluble azo-compound, akind of cationic polyacrylamide were synthesized by aqueous solution polymerizationusing acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (DAC) asmonomers. The optimum reaction conditions for synthesis of PAM-C were monomerconcentration30%, EDTA·2Na concentration0.01%, surfactant PF68concentration0.075%, urea concentration0.1%, dimethylcarbinol concentration0.18%, VA-044concentration0.007%, DIOOH concentration0.005%. In this condition, differentcationic degree polyacrylamide products were obtained, and the intrinsic viscosity ofcationic polyacrylamide were1300～1600ml/g.Cationic polyacrylamide of15%cationic degree which was synthesized inlaboratory was selected to study dying condition. The results showed that theoptimum constant dying temperature was70℃. The intrinsic viscosity of product was1523ml/g, and the dissolution time was67min. A further study on variabletemperature dying of cationic polyacrylamide product was conducted compared withconstant temperature dying. The results indicated that variable temperature dyingchoosing100℃as initial temperature was more efficient than constant temperaturedying, and the performance was also reliable.The design of a plant producing100tons cationic polyacrylamide flocculant wasmade, the deoxidization device and polymerization reactor were designed, and a pilotdying system and flow were established. Compared with other commodities, theflocculating performance of pilot product was researched through flocculating experiments using sewage of different places.