Heptane
- Formula: C7H16
- Molecular weight: 100.2019
- IUPAC Standard InChI: InChI=1S/C7H16/c1-3-5-7-6-4-2/h3-7H2,1-2H3
- IUPAC Standard InChIKey: IMNFDUFMRHMDMM-UHFFFAOYSA-N
- CAS Registry Number: 142-82-5
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Isotopologues:
- Other names: n-Heptane; Dipropylmethane; Heptyl hydride; Skellysolve C; n-C7H16; Eptani; Heptan; Heptanen; Gettysolve-C; NSC 62784
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Critical pressure
Go To: Top, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
| Pc (bar) | Reference | Comment |
|---|---|---|
| 27.4 ± 0.3 | Ambrose and Tsonopoulos, 1995 | |
| 27.30 | Nikitin, Pavlov, et al., 1994 | Uncertainty assigned by TRC = 0.40 bar; TRC |
| 27.30 | Nikitin, Pavlov, et al., 1993 | Uncertainty assigned by TRC = 0.30 bar; TRC |
| 27.30 | Quadri, Khilar, et al., 1991 | Uncertainty assigned by TRC = 0.10 bar; TRC |
| 27.34 | Rosenthal and Teja, 1989 | Uncertainty assigned by TRC = 0.20 bar; TRC |
| 27.36 | Teja, Lee, et al., 1989 | TRC |
| 27.34 | Brunner, 1988 | Uncertainty assigned by TRC = 0.05 bar; Visual, optical cell 30cm high. P transducer cal. vs PB.; TRC |
| 27.75 | Zawisza and Vejrosta, 1982 | Uncertainty assigned by TRC = 0.05 bar; Visual; TRC |
| 27.60 | Kobe and Mathews, 1970 | Uncertainty assigned by TRC = 0.5066 bar; TRC |
| 27.3652 | Kreglewski and Kay, 1969 | Uncertainty assigned by TRC = 0.1723 bar; TRC |
| 27.360 | McMicking and Kay, 1965 | Uncertainty assigned by TRC = 0.4053 bar; TRC |
| 27.70 | Kay, 1964 | Uncertainty assigned by TRC = 0.5066 bar; TRC |
| 27.50 | Kobe, Crawford, et al., 1955 | Uncertainty assigned by TRC = 0.345 bar; TRC |
| 27.3031 | Kay, 1941 | Uncertainty assigned by TRC = 0.2068 bar; TRC |
| 27.30 | Kay, 1938 | Uncertainty assigned by TRC = 1.0342 bar; TRC |
| 27.3577 | Beattie and Kay, 1937 | Uncertainty assigned by TRC = 0.0405 bar; based on obs. pvt isotherms; TRC |
| 27.3577 | Smith, Beattie, et al., 1937 | Uncertainty assigned by TRC = 0.0506 bar; TRC |
| 28.0164 | Edgar and Calingaert, 1929 | Uncertainty assigned by TRC = 0.2026 bar; measured by Keys and Kleinschmidt; TRC; Data excluded from overall average |
| 27.238 | Young, 1910 | Uncertainty assigned by TRC = 0.267 bar; TRC |
References
Go To: Top, Critical pressure, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Ambrose and Tsonopoulos, 1995
Ambrose, D.; Tsonopoulos, C.,
Vapor-Liquid Critical Properties of Elements and Compounds. 2. Normal Alkenes,
J. Chem. Eng. Data, 1995, 40, 531-546. [all data]
Nikitin, Pavlov, et al., 1994
Nikitin, E.D.; Pavlov, P.A.; Bessonova, N.V.,
Critical constants of n-alkanes with from 17 to 24 carbon atoms,
J. Chem. Thermodyn., 1994, 26, 177-82. [all data]
Nikitin, Pavlov, et al., 1993
Nikitin, E.D.; Pavlov, P.A.; Skripov, P.V.,
Measurement of the critical properties of thermally unstable substances and mixtures by the pulse-heating method,
J. Chem. Thermodyn., 1993, 25, 869-80. [all data]
Quadri, Khilar, et al., 1991
Quadri, S.K.; Khilar, K.C.; Kudchadker, A.P.; Patni, M.J.,
Measurement of the critical temperatures and critical pressures of some thermally stable or mildly unstable alkanols,
J. Chem. Thermodyn., 1991, 23, 67-76. [all data]
Rosenthal and Teja, 1989
Rosenthal, D.J.; Teja, A.S.,
The Critical Properties of n-Alkanes Using a Low-Residence Time Flow Apparatus,
AIChE J., 1989, 35, 1829. [all data]
Teja, Lee, et al., 1989
Teja, A.S.; Lee, R.J.; Rosenthal, D.J.; Anselme, M.J.,
Correlation of the Critical Properties of Alkanes and Alkanols
in 5th IUPAC Conference on Alkanes and AlkanolsGradisca, 1989. [all data]
Brunner, 1988
Brunner, E.,
Fluid Mixtures at High Pressures VI. Phase Separation and Critical Phenomena in 18 (n-Alkane + Ammonia) and 4 (n-Alkane _ Methanol) Mixtures,
J. Chem. Thermodyn., 1988, 20, 273. [all data]
Zawisza and Vejrosta, 1982
Zawisza, A.; Vejrosta, J.,
High-pressure liquid-vapor equilibria, critical stat, and p(V, T, x) up to 573.15 K and 5.066 MPa for (heptane + propan-1-ol),
J. Chem. Thermodyn., 1982, 14, 239-49. [all data]
Kobe and Mathews, 1970
Kobe, K.A.; Mathews, J.F.,
Critical Properties and Vapor Pressures of Some Organic Nitrogen and Oxygen Compounds,
J. Chem. Eng. Data, 1970, 15, 182. [all data]
Kreglewski and Kay, 1969
Kreglewski, A.; Kay, W.B.,
The Critical Constants of Conformal Mixtures,
J. Phys. Chem., 1969, 73, 3359. [all data]
McMicking and Kay, 1965
McMicking, J.H.; Kay, W.B.,
Vapor Pressures and Saturated Liquid and Vapor Densities of The Isomeric Heptanes and Isomeric Octanes,
Proc., Am. Pet. Inst., Sect. 3, 1965, 45, 75-90. [all data]
Kay, 1964
Kay, W.B.,
P-T-x Diagrams in the Critical Region. Acetone-n-Alkane Systems,
J. Phys. Chem., 1964, 68, 827-31. [all data]
Kobe, Crawford, et al., 1955
Kobe, K.A.; Crawford, H.R.; Stephenson, R.W.,
Critical Properties and Vapor Pressures of Some Ketones,
Ind. Eng. Chem., 1955, 47, 1767-72. [all data]
Kay, 1941
Kay, W.B.,
Liquid-Vapor Equil. Relations in Binary Systems. Butane-Heptane Syst. System,
Ind. Eng. Chem., 1941, 33, 590-4. [all data]
Kay, 1938
Kay, W.B.,
Liquid-Vapor Phase Equilibrium Relations in the Ethane-n-Heptane Syst.,
Ind. Eng. Chem., 1938, 30, 459-65. [all data]
Beattie and Kay, 1937
Beattie, J.A.; Kay, W.C.,
The Normal Boiling Point and Critical Constants of Normal Heptane,
J. Am. Chem. Soc., 1937, 59, 1586. [all data]
Smith, Beattie, et al., 1937
Smith, L.B.; Beattie, J.A.; Kay, W.C.,
The compressibility of liquid and gaseous normal heptane and an equation of state for gaseous normal heptane,
J. Am. Chem. Soc., 1937, 59, 1587-9. [all data]
Edgar and Calingaert, 1929
Edgar, G.; Calingaert, G.,
Preparation and Properties of the Isomeric Heptanes II. Physical Prop. properties,
J. Am. Chem. Soc., 1929, 51, 1540. [all data]
Young, 1910
Young, S.,
The Internal Heat of Vaporization constants of thirty pure substances,
Sci. Proc. R. Dublin Soc., 1910, 12, 374. [all data]
Notes
Go To: Top, Critical pressure, References
- Symbols used in this document:
Pc Critical pressure - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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