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PHYSICAL OF PHYSICAL PROPERTIES PROPERTIES OF
Published on January 1, 1961 on http://pubs.acs.org | doi: 10.1021/ba-1955-0015.fw001
CHEMICAL COMPOUNDS CHEMICAL COMPOUNDS A A systematic tabular presentation of accurate data on the physical properties of 511 organic cyclic Dow compounds compiled by R. R. Dreisbach of the Dow Chemical Co. These comprehensive and basic data were determined for specially prepared, prepared, high purity compounds. In addition to the precisely measured properties the author has calculated new values for many constants based upon his new experimental values.
R.
PEPINSKY
THE GROTH INSTITUT~ COLL~GE OF CHEMISTRY AND PHYSICS THE: PENNSYLVANIA STATE UNIVERSITY UNIVERSITY PARr.. PA .• U. S. A.
Number Number fifteen fifteen of of the the Advances Advances inin Chemistry Chemistry Series Series Industrial and Edited Edited by b y the the staff staff of of Industrial and Engineering Engineering Chemistry Published P u b l i s h e d June J u n e 1955 1955 by by AMERICAN A M E R I C A N CHEMICAL C H E M I C A L SOCIETY SOCIETY 1155 Sixteenth Street, N.W. N.W. 1155 Washington, W a s h i n g t o n , D. C.
Published on January 1, 1961 on http://pubs.acs.org | doi: 10.1021/ba-1955-0015.fw001
Copyright 1955 1955 by by AIIERlcAN CHEMICAL AMERICAN CHEMICAL SoCIETY SOCIETY All Reserved AU Rights Rightll Ruerv«l
Physical Properties
Published on January 1, 1961 on http://pubs.acs.org | doi: 10.1021/ba-1955-0015.ch001
Of Chemical Compounds R. R. Dreisbach
The Dow Chemical Co., Midland, Mich.
Definition of the Symbols and Parameters Used, with the Methods of Calculating the Parameters
% Pur.: Mole % purity by weight. F.P.! Freezing point, ° C.
Mol.
F.P. 100%: Freezing point curve extrapolated to 100% purity. B.P. 760 mm., 100 mm., etc.: Boiling points at these pressures, ° C. Pn : Pressures at 25° C., in mm. P.: Pressure corresponding to temperature t. in mm. d 20, etc.: Density at 20° C., etc., g./ml. a, b: Constants of Law of Rectilinear Diameters, dv + dL = a + bt d. = density of the vapor, g./ml.; dL = density of the liquid, g./ml. ng', etc.: Refractive index for the sodium line at 20° C., etc.
+ 0.4) l)/(nfi + 2) X
"c"
"C": Constant of the Eykman equation, (nfi - 1)/(no
X l/d =
MR (obs.): Molal refraction (obs.) = (nfi (M = mol. wt.)
M/d = MR at 20° C.
MR (calc.): Molal refraction calculated from atomic refractive indices. See page 9. 3
ADVANCES IN CHEMISTRY SERIES
(nu - d/2): Refractivity intercept equals refractive index minus one half the density, both at the same temperature, 20° C. D: Dielectric constant run at a frequency of 1()6 (cycles/sec.) and at 25° C. unless otherwise noted. When reported as data of The Dow Chemical Co., error about ±0.005. Where Reference 5 is noted it was obtained by squaring the refractive index at 20° C.
Published on January 1, 1961 on http://pubs.acs.org | doi: 10.1021/ba-1955-0015.ch001
A, B, C: Constants of the Antoine vapor pressure equation for the liquid state, giving P (pressure) in mm. and t (temperature) in ° C. This is in the range between the temperatures as indicated. These temperatures in general are the boiling point at 30 mm. to a TR of 0.75 to 0.80. See method of obtaining A, B, C on page 6. Antoine equation: log P = A - B/(t + C) A·, B*, K, c, tk, tx: Constants of the saturated vapor density equation log dy(g./ml.) = A* - B·/(t + C) to the temperature tk log dy(g./ml.) = A· - B·/(t + C) + K/(1.1 Tc - 273.2 - t) + c from temperature h to a reduced temperature, Ta, of 0.92 tk = Temperature at which it is necessary to change from the simple vapor density equation to the corrected vapor density equation in the higher ranges, ° C. tk = tx + K/c and tx = (1.1 Tc -