Synthesis and research on scale inhibition of calcium scale silicon and silicon scale

Maleic anhydride,acrylamide and sodium phosphite,polyethylene glycol 4000 as monomers,ammonium persulfate and sodium bisulfite as initiator to synthesize quadripolymer. The best synthetic conditions is that the monomer ratio is n( MA) ∶ n( AM) ∶ n( PEG) = 1 ∶ 0. 8 ∶ 0. 04,monomer mass is 20%,dosage of initiator is 10%,temperature of polymerize is 85 ℃,time of polymerize is 4 h,dosage of SHP is18%. The results showed that the anti-scaling agent added amount 100 mg/L,the rate of calcium carbonate scale inhibition is 98. 96%,the rate of silicon scale inhibition is 70. 26%. When the temperature of static test under 85 ℃,the rate of calcium carbonate scale inhibition and silicon scale inhibition more than 90% and 60%. Results show that this quadripolymer is an excellent performance of scale inhibitors.