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Vapor−Liquid Critical Properties of Some Tetraalkoxysilanes

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Institute of Thermal Physics, Ural Branch of Russian Academy of Sciences, Amundsena Street, 106, 620016 Ekaterinburg, Russia
Institute of Organic Synthesis, Ural Branch of Russian Academy of Sciences, Sof’i Kovalevskoi Street, 20, 620219 Ekaterinburg, Russia
* Corresponding author. E-mail: [email protected]. Fax: +7-343-2678800.
Cite this: J. Chem. Eng. Data 2008, 53, 6, 1371–1374
Publication Date (Web):May 7, 2008
https://doi.org/10.1021/je800086s
Copyright © 2008 American Chemical Society

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    Abstract

    The critical pressures and the critical temperatures of ten tetraalkoxysilanes (tetraalkyl esters of silicic acid) Si[O(CH2)nH]4 with n = 1 to 10 have been measured. All the substances studied begin to decompose at temperatures below their critical points. The method of pulse-heating applicable to thermally unstable compounds has been used. Residence times were from (0.03 to 1) ms, which resulted in little decomposition of the substances during measuring. The experimental critical properties of tetraalkoxysilanes have been compared with the values estimated by the group-contribution methods of Lydersen and Nannoolal et al.

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