Citation: ZHENG Dandan, ZHANG Ying. Inhibition of Scale by Environmentally Friendly Scale Inhibitor and the Interaction Simulation[J]. Chinese Journal of Applied Chemistry, ;2019, 36(11): 1308-1316. doi: 10.11944/j.issn.1000-0518.2019.11.190089 shu

Inhibition of Scale by Environmentally Friendly Scale Inhibitor and the Interaction Simulation

ZHENG Dandan ,
ZHANG Ying ^,

School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China

Corresponding author: ZHANG Ying, 15222090269@163.com
Received Date: 2 April 2019
Revised Date: 20 May 2019
Accepted Date: 25 June 2019

Figures(9)

In order to solve the problem that polyaspartic acid (PASP) has poor scale inhibition effect at high Ca²⁺ concentration and poor effect of dispersing iron oxide, tyrosine (Tyr) was grafted to the side chain of PASP by ring-opening modification of the intermediate polysuccinimide (PSI). An environmentally friendly scale inhibitor of tyrosine-polyaspartic acid copolymer (Tyr-PASP) was synthesized and possessed a plurality of functional groups such as carboxyl group, amino group, amide group and phenolic hydroxyl group. The static scale inhibition experiment proved that Tyr-PASP possessed a better scale inhibition ability than PASP. When the molar ratio of n(Tyr):n(PSI)=1:1, Tyr-PASP showed the best scale inhibition effect against CaCO₃, and the inhibition efficiency reached up to 100% with a mass concentration of 4 mg/L. At 5 mg/L, the inhibition efficiency against CaSO₄ also achieved 100%. After the addition of Tyr-PASP, the crystal form of scale changed from stable calcite and aragonite to unstable vaterite, and the morphology became loose. Molecular dynamics simulations show that the binding between Tyr/PASP and calcite is exothermic and the binding energy is much higher than that of conventional adsorption energy. Electrostatic forces play a major role in the binding between Tyr-PASP and calcite. In addition, the dispersion effect of Tyr-PASP on iron oxide is also significantly improved.
- tyrosine-polyaspartic acid copolymer,
- scale inhibition,
- crystal form,
- dispersion,
- molecular dynamics simulation
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