Cross-linked carboxymethyl starch CMS was synthesized with cross-linked starch as raw material, sodium chloroacetate as etherification agent and sodium hydroxide as catalyst, and the structure of the product was characterized by FTIR, SEM and XRD. The optimum synthesis conditions of CMS were m (CSt): m (MCA) = 5:3, NaOH dosage 12 ml, reaction temperature 55 °C and reaction time 3 h. When the concentration of copper ion in the simulated water sample was 25 mg/L and the dosage of CMS was 2 g/L, the removal rate of copper ion was 96.0%, and the adsorption capacity of CMS was 15.4 mg/g.
The polyaspartic acid derivative compound was applicated in circulating cooling water system with high concentration multiple with the water quality of circulating cooling water system was characterized by higher hardness, higher alkalinity and higher corrosive ion content in order to solve the problem of scale and corrosion of the circulating cooling water system. The formulation of the polyaspartic acid derivative compound was determined to be PASP-AESA-ASP, ZnSO4, HPAA and BTA with the mass ratio of 15:4:6:0.1. The polyaspartic acid derivative compound had a good protective effect on A3 carbon steel in high-concentration-salt water and good biodegradability.
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