Vapor pressures and densities of 2,3-dimethyl-2-butene and 3,3-dimethyl-1-butene
| Autor: | Armen. Baghdoyan, Vojtech Fried, Jana. Malik |
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| Rok vydání: | 1971 |
| Předmět: | |
| Zdroj: | Journal of Chemical & Engineering Data. 16:96-97 |
| ISSN: | 1520-5134 0021-9568 |
| DOI: | 10.1021/je60048a009 |
| Popis: | The vapor pressures and densities of 2,3-dimethyl-2-butene and 3,3-dimethyl-l-butene were determined experimentally at different temperatures. The constants of the Antoine equation are: 6.93075, -1 205.663, and 224.460 for 2,3-dimethyl-2-butene; and 6.75953, -1 053.5 17, and 230.336 for 3,3-dimethyl-1 -butene, respectively. The density equations are: d' = 0.70827 - 0.90023 x (t 20)'far2,3-dimethyl-2-buteneanddf = 0.65291 -0.10064 x 10-'(t- 20) - 0.21039 x 1 0-6 (f - 2O)'for 3,3-dimethyl-1 -butene, respectively. (t - 20) - 0.72335 x The literature dealing with the vapor pressures and densities of organic compounds is very extensive (I, 2, 4, 6, 7). However, not enough data are available for some of the olefinic hydrocarbons. Since the solution of a certain theoretical problem, statistical mechanics of solutions of isomers, required the knowledge of the vapor pressures and densities of 2,3-dimethyl-2-butene and 3,3-dimethyl1-butene in a wide range of temperature, we have determined them experimentally. EXPERIMENTAL Aldrich chemicals of highest purity were used without further purification since gas chromatographic analysis failed to show any significant impurities. The small difference between the boiling point and condensation temperature, O.O02"C, at a pressure of 1 atm also indicated that the samples did not contain sufficient impurities of different volatility to have any significant effect on the vapor pressure measurements. Experimentally found densities (gram cc-') and boiling points ('C) were in good agreement with the literature values: 2,3-dimethyl-2-butene, d" = 0.70375 (0.7034); tnhp = 73.24 (73.21 - 73.24); 3,3-dimethyl-l-butene, The vapor pressures were measured by a dynamic method using two ebulliometers connected in parallel to the pressure controlling system (3). One of the ebulliometers contained deionized and twice distilled water, and the other contained the substance under study. From the boiling point of water, the corresponding pressure in the system was determined (6), with an accuracy better than 0.1 mm Hg. The boiling points of water and the hydrocarbons respectively, were measured with a 25-ohm platinum resistance thermometer (Leeds and Northrup) in a Mueller bridge circuit (Leeds d" = 0.64787 (0.64786); tnhp = 41.28 (41.24) (I, 2, 6, 7). |
| Databáze: | OpenAIRE |
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