Study of the Kinetic Features of Bimodal Gelation in Viscous Flow Fluids

Autor: I. V. Kumpanenko, E. O. Panin, A. V. Roshchin, E. G. Raevskaya, N. Yu. Kovaleva, N. A. Ivanova
Rok vydání: 2020
Předmět:
Zdroj: Russian Journal of Physical Chemistry B. 14:100-110
ISSN: 1990-7923
1990-7931
Popis: The kinetic features of bimodal gelation in viscous flow fluids, in particular, petroleum products, are analyzed by viscometry. The gelation and densification of petroleum products facilitate the elimination of consequences of their spill. Experimental dependences on the viscosity time of gasoline, kerosene, and winter and summer diesel fuel mixtures with lithium tetralkoxyborate as a gelator are measured. These dependences are found to have a bimodal sigmoidal shape called the dose-response form in scientific publications. A mathematical formula is proposed to describe these bimodal dependences. In accordance with this formula, the gelation process consists of two stages: (1) a reaction of lithium tert-butylate Li–O–C(CH3)3 and trialkoxyborate B(OC8H17)3 with the formation of lithium tetralkoxyborate; (2) a gelation reaction of lithium tetralkoxyborate and hydrocarbons of the mentioned petroleum products. The formula contains a number of fitting parameters, e.g., tinf1 and tinf2 (h) are the onset times of gelation and the formation of a stable gel respectively; h1 and h2 (h–1) are the rate constants of the first and second stages of gelation, and so on. The concentration dependences of gelators on these parameters are determined. Based on these dependences, the conclusions are drawn about the kinetic features of bimodal gelation in viscous flow fluids.
Databáze: OpenAIRE
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