Chemistry & Chemical Technology. – 2012. – Vol. 6, No. 2

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The scientific-technical journal

It is the scientific-technical journal in English in Ukraine discussing actual problems of chemistry and chemical technology. Compared with other chemical journals Ch&ChT is publishing materials of both theoretical and practical values in such fields as analytical, general organic, physical and inorganic chemistry; chemistry of high molecular compounds; materials science and engineering; chemical kinetics and catalysis; technology of inorganic substances; technology of organic synthesis products; chemical technology of processing of combustible minerals; processes and apparatus of chemical and food productions; biotechnology and ecology.

Chemistry & Chemical Technology : [the scientific-technical journal] / Lviv Polytechnic National University ; editor-in-chief M. Bratychak. – Lviv : Publishing House of Lviv Polytechnic National University, 2012. – Volume 6, number 2. – P. 119–235, IV : ill.

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Start date: 2012Subject: search.filters.subject.ультразвук

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    Ultrasonic activation of the catalysts of ethylbenzene dehydration to styrene
    (Publishing House of Lviv Polytechnic National University, 2012) Zhyznevskiy, Vyacheslav; Gumenetskiy, Volodymyr; Shyshchak, Olena; Tsybukh, Roman
    The ultrasonic treatment of Fe2-Bi-Mo2-Ox catalyst of ethylbenzene oxidative dehydration to styrene has been studied. Its physico-chemical properties have been compared with those of non-activated catalyst before and after operation. It has been shown that the catalyst prepared from salts solution activated by ultrasound has better activity and increases styrene yield under the same conditions. Досліджено ультразвукове оброблення Fe2-Ві-Мо2-Ох каталізатора окиснювального дегідрування етилбензолу в стирол та порівняно його фізико-хімічні властивості з неактивованим каталізатором до і після роботи. Показано, що виготовлений з розчину солей і активований ультразвуком каталізатор має кращу активність та підвищує у порівняльних умовах вихід стиролу.
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    Starch dispersion in water under ultrasonic treatment
    (Publishing House of Lviv Polytechnic National University, 2012) Starchevsky, Volodymyr; Kislenko, Vоlоdymyr; Ivanyshyn, Svyatoslove
    Decomposition of starch grains in water dispersion and destruction of starch macromolecules in water solutions at acoustic cavitation has been investigated. Kinetics of this process is described by the first order process. Based on experimental data the rate constants have been found. Mathematical model based on found equations and experimental rate constants allows describing the kinetics of starch grains and starch macromolecules destruction in water as well as the change of relative viscosity of starch solution under ultrasonic treatment. Кінетика процесу деструкції крохмальних зерен у водній дисперсії і руйнування макромолекул крохмалю в водних розчинах при акустичній кавітації описується рівнянням першого порядку. Наведена математична модель, яка описує кінетику деструкції зерен та макромолекул крохмалю у воді, а також зміну відносної в'язкості розчину крохмалю при ультразвуковій обробці.