Propylene Glycol
- Formula: C3H8O2
- Molecular weight: 76.0944
- IUPAC Standard InChI: InChI=1S/C3H8O2/c1-3(5)2-4/h3-5H,2H2,1H3
- IUPAC Standard InChIKey: DNIAPMSPPWPWGF-UHFFFAOYSA-N
- CAS Registry Number: 57-55-6
- 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. - Species with the same structure:
- Stereoisomers:
- Other names: 1,2-Propanediol; α-Propylene glycol; Methylethyl glycol; Methylethylene glycol; Monopropylene glycol; PG 12; Sirlene; 1,2-Dihydroxypropane; 1,2-Propylene glycol; 2-Hydroxypropanol; 2,3-Propanediol; Propane-1,2-diol; Dowfrost; Propylene glycol USP; 1,2-Propylenglykol; Solar winter ban; Sentry Propylene Glycol; Isopropylene glycol; Ucar 35; Solargard P; Ilexan P; Prolugen; Trimethyl glycol; 1,2-Propandiol; Propylenglycol; (RS)-1,2-Propanediol; (.+/-.)-1,2-Propanediol; DL-1,2-Propanediol; NSC 69860; DL-Propylene glycol; propylene glycol (1,2-propanediol); 1,2-propanediol (propylene glycol); propanediol; Methyl glycol
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Gas phase thermochemistry data
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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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -102.7 ± 0.98 | kcal/mol | Ccb | Knauth and Sabbah, 1990 | ALS |
| ΔfH°gas | -100.7 ± 0.8 | kcal/mol | Ccb | Gardner and Hussain, 1972 | ALS |
| ΔfH°gas | -104.0 | kcal/mol | N/A | Moureu and Dode, 1937 | Value computed using ΔfHliquid° value of -500.3±1.8 kj/mol from Moureu and Dode, 1937 and ΔvapH° value of 65.0 kj/mol from Gardner and Hussain, 1972.; DRB |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
+
=
+
By formula: C3H8O2 + C3H6O = C6H12O2 + H2O
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -0.8 | kcal/mol | Eqk | Anteunis and Rommelaere, 1970 | liquid phase |
+ 2
=
+
By formula: C4H6O3 + 2CH4O = C3H8O2 + C3H6O3
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | -1.66 | kcal/mol | Kin | Zhang and Luo, 1991 | liquid phase |
Gas phase ion energetics data
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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:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| CH5O+ | 10.04 ± 0.05 | CH3CO | EI | Holmes and Lossing, 1984 | LBLHLM |
| C2H5O+ | 10.16 ± 0.05 | CH2OH | EI | Holmes and Lossing, 1984 | LBLHLM |
| C2H5O+ | 10.25 | CH2OH | EI | Lossing, 1977 | LLK |
References
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Knauth and Sabbah, 1990
Knauth, P.; Sabbah, R.,
Energetics of inter- and intramolecular bonds in alkanediols. IV. The thermochemical study of 1,2-alkanediols at 298.15 K,
Thermochim. Acta, 1990, 164, 145-152. [all data]
Gardner and Hussain, 1972
Gardner, P.J.; Hussain, K.S.,
The standard enthalpies of formation of some aliphatic diols,
J. Chem. Thermodyn., 1972, 4, 819-827. [all data]
Moureu and Dode, 1937
Moureu, H.; Dode, M.,
Chaleurs de formation de l'oxyde d'ethylene, de l'ethanediol et de quelques homologues,
Bull. Soc. Chim. France, 1937, 4, 637-647. [all data]
Anteunis and Rommelaere, 1970
Anteunis, M.; Rommelaere, Y.,
NMR experiments on acetals. XXIX. The ease of acetonide formation of some glycols,
Bull. Soc. Chim. Belg., 1970, 79, 523-530. [all data]
Zhang and Luo, 1991
Zhang, S.; Luo, Y.,
Kinetics and technological conditions for the synthesis of dimethyl carbonate,
Chem. React. Eng. Tech., 1991, 7, 10-19. [all data]
Holmes and Lossing, 1984
Holmes, J.L.; Lossing, F.P.,
Heats of formation of organic radicals from appearance energies,
Int. J. Mass Spectrom. Ion Processes, 1984, 58, 113. [all data]
Lossing, 1977
Lossing, F.P.,
Heats of formation of some isomeric [CnH2n+1]+ ions. Substitutional effects on ion stability,
J. Am. Chem. Soc., 1977, 99, 7526. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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