| Polyaspartic acid (for short PASP) is a kind of biodegradable, innoxious, environ- mental protection new biomacromolecule material. Its use is extremely widespread, related to the industrial water treatment, the agriculture, the medicine and so on. At present, it was reported rarely on its inhibition performance research. The study of this thesis may be provide the certain theory reference for polyaspartic acid improvement, the new environ- mental protection scale inhibitors preparation research and development and so on.Using maleic anhydride and salvolatile as raw material, PASP was synthesized by a way of solid melting polymerization with best experimental condition. The synthetic product was characterized by the Infrared Spectrum and its average molecular weight was determined by GPC.The influence of PASP concentration, Ca2+ concentration, pH value and temperature in circular cooling water on the PASP inhibiting CaCO3 effect was studied, by static scale inhibition method. The results indicated that: the solution Ca2+ concentration variety had an important effect for PASP inhibition; pH value and the temperature variety had a little effect for PASP inhibition.The influence of PASP on the CaCO3 super-saturation is researched by using the critical pH method. The results indicated that: PASP can remarkably enhance CaCO3 apparent super-saturation in the solution. PASP was able to promote the less stable vaterite deposition in the super-saturated solution by XRD.The influence of PASP on the CaCO3 crystal growth was studied by using the crystal growth dynamic method. The results proved that: PASP inhibited CaCO3 crystal growth by adsorption which belonged to the macromolecular compound surface adsorption. And the adsorption model was established. In course of crystal growth, it validated that the crystal style didn't change by XRD and TEM.In the dissolved CaCO3 experiment, PASP played an unimportant role and only enhanced part of CaCO3 dissolved degree by chelateding Ca2+. |
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