DETERMINATION OF CRITICAL VALUE OF pH OF GEL FORMATION IN SILICATE-ALKALI MIXTURES OF VARIOUS COMPOSITION

Authors

  • Оlga Titova National Aviation University
  • Natalia Stoliarova National Aviation University
  • Zoia Hrushak National Aviation University
  • Tetiana Kravchuk National Aviation University

DOI:

https://doi.org/10.18372/2306-1472.71.11753

Keywords:

dynamics of pH change, gel formation, pH value, sodium silicate

Abstract

Purpose: The aim of this study is the research of a possibility of a direct and reverse titration usage for the critical pH determination. pH value change of the silicate-alkali mixture was analyzed while addition of alkalis, salt water and sodium hydrogen carbonate solutions. Methods: Methods of direct and reverse titration were used for the determination of various additives influence on results of pH measuring of sodium silicate mixtures. Results: Additives method or reverse titration of the alkali solution are the most appropriate methods for the determination of free alkali content in silicate solutions. Dilution of silicate-alkali solutions by salt water or its model leads to the faster decrease of pH value, than in case of water without any salts of hardness. Hydrogen carbonates influence should be accounted when execution of accurate calculations used in the development of silicate-alkali mixtures usage technology. Discussion: Alkali-silicate mixtures would be solutions for a long time when filtration proceeds in the porous medium at рН > рНcrit. The time of such solutions existence must be characterized by a before inductive period. When reaching the critical pH value, a gel is formed during an inductive period or the time of gel formation. As a rule, the before inductive period is in ten times or even more greater than the time of gel formation.

Author Biographies

Оlga Titova, National Aviation University

Olga Titova (1953). Candidate of chemical sciences, Аssociate professor.

Department of Chemistry and Chemical Technology, Educational and Research Institute of Environmental Safety, National Aviation University.

Education: Kyiv State University named by T.G. Shevchenko, Kyiv, Ukraine, (1977).

Research area: сhemistry.

Natalia Stoliarova, National Aviation University

Natalia Stoliarova (1958). Assistant Professor.

Department of Chemistry and Chemical Technology, Educational and Research Institute of Environmental Safety, National Aviation University.

Education: Kyiv Institute of Civil Aviation, Kyiv, Ukraine, (1987).

Research area: сhemistry.

Zoia Hrushak, National Aviation University

Zoia Hrushak (1975). Junior lecturer.

Department of Chemistry and Chemical Technology, Educational and Research Institute of Environmental Safety, National Aviation University.

Education: Kyiv International University of Civil Aviation, Kyiv, Ukraine, (1999).

Research area: сhemistry

Tetiana Kravchuk, National Aviation University

Tetiana Kravchuk (1986). Junior lecturer.

Department of Chemistry and Chemical Technology, Educational and Research Institute of Environmental Safety, National Aviation University.

Education: National Aviation University, Kyiv, Ukraine, (2009).

Research area: chemical thermodynamics and thermochemistry.

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Published

17-07-2017

How to Cite

Titova О., Stoliarova, N., Hrushak, Z., & Kravchuk, T. (2017). DETERMINATION OF CRITICAL VALUE OF pH OF GEL FORMATION IN SILICATE-ALKALI MIXTURES OF VARIOUS COMPOSITION. Advances in Aerospace Technology, 71(2), 100–107. https://doi.org/10.18372/2306-1472.71.11753

Issue

Section

CHEMICAL TECHNOLOGY, HIMMOTOLOGY