Preparation and Scale Inhibition Performance of Carboxyl-Terminated Hyperbranched Green Scale Inhibitor

doi:10.19491/j.issn.1001-9278.2020.09.007

Abstract

Abstract:

A carboxyl-terminated hyperbranched green scale inhibitor based on the xylitol core was successfully prepared by melt polymerization, and its chemical structure was characterized by FTIR and ¹H-NMR. The effects of scale inhibitor dosage, pH of water environment and water temperature on calcium carbonate and calcium sulfate inhibition were investigated by means of a static scale inhibition method. The results indicated that the green scale inhibitor exhibited excellent inhibition efficiency on calcium scale (CaCO₃ and CaSO₄) under a wide range of temperature and a water environment of pH 6~9. The scale inhibition efficiency of calcium carbonate reached 91.6 % at the scale inhibitor dosage of 24 mg/L, while the scale inhibition efficiency of calcium sulfate reached 94.7 % at the dosage of 15 mg/L. Moreover, the SEM observation showed that this green scale inhibitor could greatly reduce the regularity of calcium scale crystal. As for calcium carbonate scale, the green scale inhibitor could promote its lattice distortion of calcium carbonate scale to achieve the purpose of dispersion scale inhibitor.

Key words: xylitol, hyperbranched polyester, scale inhibition, citric acid, calcium scale

CLC Number:

TQ317.4

LI Meilan, HE Zichun, MU Kaifei, GONG Wei, LAI Qian, YANG Meng, LIU Bailing. Preparation and Scale Inhibition Performance of Carboxyl-Terminated Hyperbranched Green Scale Inhibitor[J]. China Plastics, 2020, 34(9): 38-45.

Figures/Tables 12

Fig.1. Synthetic route of carboxy terminated hyperbranched green scale inhibitor

Fig.2. FTIR spectra of carboxy terminated hyperbranched green scale inhibitor

Fig.3. 1H?NMR spectra of carboxy terminated hyperbranched green scale inhibitor

Fig.4. Effect of carboxy terminated hyperbranched green scale inhibitor dosage on calcium scale inhibition performance

Fig.5. Effect of pH on the carboxy terminated hyperbranched green scale inhibitor calcium scale inhibition performance

Fig.6. Effect of water temperature on the carboxy terminated hyperbranched green scale inhibitor calcium scale inhibition performance

阻垢剂类型	透光率/%	Zeta电位/mV
H₂O	83.1	-1.6
柠檬酸	30.2	-11.9
端羧基超支化型绿色阻垢剂	9.5	-22.7

Tab.1. Dispersion of carboxy terminated hyperbranched green scale inhibitor

Fig.7. SEM images of calcium sulfate scale

Fig.8. Relationship between the conductivity of mixed solution and the nucleation time of calcium sulfate crystals

Fig.9. SEM images of calcium carbonate scale

Fig.10. FTIR spectra of calcium carbonate scale with using carboxy terminated hyperbranched green scale inhibitor

阻垢剂类型	细菌/个·g^-1	放线菌/个·g^-1	真菌/个·g^-1
对照组	7.46×10⁶	2.71×10³	5.03×10⁵
端羧基超支化阻垢剂	6.81×10⁶	2.66×10³	5.19×10⁵

Tab.2. Microorganism growth after 10 days of scale inhibition by carboxy terminated hyperbranched green scale inhibitor in circulating water (simulated)

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