Prepation and Study on Synthesis of Poly-aspartic Acid

Maleic Anhydride was used as the material to synthesize PASP.The varieties of ammonium salts,the ratios of Maleic Anhydride and salvolatile,the synthesis times and synthesis temperatures were focused on to find out the influences to the productivity and the molecular weight of PASP.The optimal process conditions by the highest yield of the synthesises were n(Maleic Anhydride):n(Ammonium Carbonate)=1:1.2,polymerization temperature 180 ℃,polymerization reaction time 1 h.The purity of PASP highly reached 90% and the yields were more than 94%.There were scale inhibition and corrosion inhibition performance for PASA.It can be widely used in industrial circulating cooling water treatment,oilwater treatment and other fields.