Some progress in scale inhibition mechanisms understanding, provided by a fluorescent visualization of gypsum scale formation and a special dynamic light scattering technique

8^th European Chemistry Congress

June 21-23, 2018 | Paris, France

K Popov, M. Oshchepkov, Y.Dikareva and S. Kamagurov

PJSC Fine Chemicals R&D Centre, Russian Federation
Mendeleev University of Chemical Technology of Russia, Russian Federation

Posters & Accepted Abstracts: Chem Sci J

Abstract :

A dynamic light scattering (DLS) special technique is used to study the bulk supersaturated gypsum aqueous solutions during the induction period applying the standard SiO2 nanoparticles (Ludox TM40) as an indifferent light scattering intensity reference in presence of amino-tris(methylenephosphonic acid), ATMP, hydroxyethanebis(phosphonic acid), HEDP, and a fluorescent-tagged HEDP (F-HEDP) at ambient temperature and pH 9. It is found that all the antiscalants sufficiently reduce the number of gypsum nuclei, spontaneously formed in the supersaturated solutions. A tentative nonconventional mechanism of scale inhibition is proposed. It assumes that the crystal formation centers already exist in any analytical grade aqueous solution in the form of solid nanoimpurities with a size ranging from one to several hundred nm. An antiscalant competes with Ca2+ for these centers and blocks them. Therefore the number of gypsum growth centers diminishes significantly. Thus the concentration of corresponding CaSO4�· 2H2O particles gets reduced at least 10-fold relative to the blank experiments. A visualization of Gypsum crystals by F-HEDP confirms this conclusion. Fluorescent microscope images of Gypsum crystals formed in a presence of F-HEDP under different conditions. The authors would like to thank the russian foundation for basic research (Project No. 17-08-00061) and partly the russian scientific foundation (project 18-13-00144).

Biography :

Graduated from Moscow Lomonosov State University (Inorganic Chemistry), 1972, Moscow. doctoral work 1972-1975; PhD, Moscow Lomonosov State University (Inorganic Chemistry), 1976, Moscow. Postdoctoral work (1984-1985) with prof G Anderegg, inorganic chem department, ETH, Zurich, Switzerland. Dr Sci degree (chemistry) at kurnakov institute of inorganic and general chemistry, moscow, 1992. 1998-2001 titular member of IUPAC. 2000-2001 IUPAC V6 commission secretary. He has published more than 120 papers in journals with a high impact factor and has more than 5 patents and has been serving as expert of russian and bulgarian academies sci.

E-mail: ki-popov49@yandex.ru