E.A. Kovaleva - Ph. D. (Chem.), Associate Professor, Ufa State Petroleum Technological University E-mail: kovaleva-ugntu@yandex.ru M.Yu. Dolomatov - Dr. Sc. (Chem.), Professor, Physico-Technical Institute of Bashkir State University (Ufa) E-mail: mdolomatov@bk.ru