Synthesis of polyaspartic acid scale inhibitor from ammonium carbonate and maleic anhydride

Polyaspartic acid was synthesized with raw materials maleic anhydride and salvolatile.Nitrogen fixation required low temperature and improved temperature polymerization intermediate sub-acid poly amber(PSI),PSI alkaline hydrolysis into polyaspartic acid(PASP) scale inhibitors.Effect of reaction temperature,reaction time and condensity of the PASP on PASP were studied.Experiment results showed that n(MA)∶ n(AC) = 1∶ 1.2,reacted 1.5 h at low reaction temperature 65 ℃,reacted 1 h at high reaction temperature 178 ℃,PSI was prepared,then was hydrolyzed to generate polyaspartate at 75 ℃ under the concentration 2.0 mol/L of NaOH solution inhibitor polyaspartic acid salt,PASP concentrate was 2.0 mg/L,scale inhibition rate was 98.80%.