Synergistic Effects of Organic Phosphorous and Polymer Additives on Sodium(Potassium) Fluosilicate Inhibition

doi:10.3724/SP.J.1095.2014.30360

Chinese Journal of Applied Chemistry

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Synergistic Effects of Organic Phosphorous and Polymer Additives on Sodium(Potassium) Fluosilicate Inhibition

SHEN Xianghua, YIN Xiaoshuang^*, YANG Wenzhong

(School of Science,Nanjing University of Technology,Nanjing 211816,China)

Received:2013-07-18 Revised:2013-09-04 Published:2014-06-10 Online:2014-06-10

Abstract

Abstract: Effects of 2-phosphonobutane-1,2,4-tricarboxylic acid(PBTCA) and N-(2-hydroxypropyl)methacrylamide(HPMA) inhibitors on the sodium(potassium) fluorosilicate crystallization were studied by turbidity and static methods. Mechanism of inhibition was explained according to classic nucleation theory. Morphology and crystal form of sodium(potassium) fluorosilicate were characterized by SEM and XRD. The results show that PBTCA and HPMA can inhibit crystallization precipitation by improving the surface free energy of sodium(potassium) fluorosilicate. The mixture of PBTCA and HPMA has distinct synergy, which can improve surface free energy of Na2SiF6 from 108 mJ/m2 to 126 mJ/m2, inhibition rate of Na+ from 6.2% to 70.3%, surface free energy of K2SiF6 from 199 mJ/m2 to 230 mJ/m2 and inhibition rate of K+ from 10.2% to 45.3%, respectively. Particles of sodium(potassium) fluorosilicate are dispersed and diminished in the presence of PBTCA and HPMA. The crystal form is mainly NaKSiF6 in the blank solution, while they are mainly Na2SiF6 and K2SiF6 in the presence of PBTCA and HPMA.

Key words: sodium(potassium) fluorosilicate, scale inhibition, surface free energy, induction period

CLC Number:

O657

SHEN Xianghua, YIN Xiaoshuang*, YANG Wenzhong. Synergistic Effects of Organic Phosphorous and Polymer Additives on Sodium(Potassium) Fluosilicate Inhibition[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30360.

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Synergistic Effects of Organic Phosphorous and Polymer Additives on Sodium(Potassium) Fluosilicate Inhibition

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