2-propanethiol: experimental thermodynamic studies from 12 to 500/sup 0/K. The chemical thermodynamic properties from 0 to 1000/sup 0/K

Journal Article · Tue Oct 05 04:00:00 EST 1954 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja01648a009· OSTI ID:7319824

McCullough, J P; Finke, H L; Scott, D W; Gross, M E; Messerly, J F; Pennington, R E; Waddington, G

Experimental studies were made of the thermodynamic properties of 2-propanethiol. The entropy of the liquid at saturation pressure at 298.16/sup 0/K, 55.82 cal. deg./sup -1/ mole/sup -1/ was computed from calorimetric values of the heat capacity in the solid and liquid states (13 to 322/sup 0/K) and of the heats of transition and fusion (12.63 cal. mole/sup -1/ at 112.5/sup 0/K and 1371 cal. mole/sup -1/ at the triple point, 142.64/sup 0/K, respectively). Results obtained for the heat capacity in the liquid state (C/sub satd/), vapor pressure (p), heat of vaporization (..delta..H/sub v/), heat capacity in the ideal gaseous state (C/sup 0//sub p/), and second virial coefficient (B = (PV - RT)/P) are represented by the following empirical equations: (1) C/sub satd/(liq.) = 37.14 - 4.956 x 10/sup -2/T + 1.481 x 10/sup -4/T/sup 3/ - 238.3/T, cal. deg./sup -1/ mole/sup -1/ (150 to 330/sup 0/K); (2) log/sub 10/ p (mm) = 6.87734 - 1113.895/(t + 226.157), (10 to 86/sup 0/); (3) ..delta..H/sub v/ = 10,066 - 7.214 T - 9.864 x 10/sup -3/T/sup 2/, cal. mole/sup -1/ (290 to 326/sup 0/K); (4) C/sup 0//sub p/ = 3.17 + 0.07564T - 3.167 x 10/sup -5/T/sup 3/, cal. deg./sup -1/ mole/sup -1/ (317 to 487/sup 0/K) ; and (5) B = -318 - 32.8 exp (1000/T), cc. mole/sup -1/ (290 to 487/sup 0/K). The entropy in the ideal gaseous state at 298.16/sup 0/K, 77.51 cal. deg./sup -1/ mole/sup -1/, and the standard heat of formation from graphite, hydrogen and gaseous diatomic sulfur, -33.46 kcal. mole/sup -1/ at 298.16/sup 0/K, were computed from these data and heat of combustion data reported elsewhere. Values of the functions (F/sup 0/ - H/sub 0//sup 0/)/T, (H/sup 0/ - H/sub 0//sup 0/)/T, H/sup 0/ - H/sub 0/, S/sup 0/ and C/sup 0//sub p/ at selected temperatures hindering internal rotation required for these calculations were evaluated from the calorimetric entropy and vapor heat capacity data. Values of the heat, free energy and equilibrium constant of formation of 2-propanethiol were computed from the calculated thermodynamic functions and the experimental value of the heat of formation at 298.16/sup 0/K.

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7319824
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 76:19; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ENERGY
ENTHALPY
ENTROPY
FLUIDS
FORMATION HEAT
FREE ENERGY
FUSION HEAT
HEAT
HIGH TEMPERATURE
LIQUIDS
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHYSICAL PROPERTIES
REACTION HEAT
SOLIDS
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
THIOLS
TRANSITION HEAT
ULTRALOW TEMPERATURE
VAPOR PRESSURE
VAPORIZATION HEAT
VERY LOW TEMPERATURE