Ethylene oxide
- Formula: C2H4O
- Molecular weight: 44.0526
- IUPAC Standard InChIKey: IAYPIBMASNFSPL-UHFFFAOYSA-N
- CAS Registry Number: 75-21-8
- 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. - Other names: Oxirane; Dihydrooxirene; Dimethylene oxide; Epoxyethane; Ethene oxide; ETO; Oxacyclopropane; Oxane; Oxidoethane; Oxirene, dihydro-; Oxyfume; Oxyfume 12; T-Gas; 1,2-Epoxyethane; Aethylenoxid; Amprolene; Anprolene; Anproline; ENT-26263; E.O.; 1,2-Epoxyaethan; Ethyleenoxide; Etylenu tlenek; FEMA No. 2433; Merpol; NCI-C50088; α,β-Oxidoethane; Oxiraan; Oxiran; Rcra waste number U115; Sterilizing gas ethylene oxide 100%; UN 1040; Qazi-ketcham
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Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change 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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | -12.58 | kcal/mol | Review | Chase, 1998 | Data last reviewed in September, 1965 |
ΔfH°gas | -12.58 ± 0.15 | kcal/mol | Cm | Pell and Pilcher, 1965 | ALS |
ΔfH°gas | -16.8 | kcal/mol | N/A | Moureu and Dode, 1937 | Value computed using ΔfHliquid° value of -95.7±1.3 kj/mol from Moureu and Dode, 1937 and ΔvapH° value of 25.51 kj/mol from missing citation.; DRB |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°gas | -312.15 ± 0.14 | kcal/mol | Cm | Pell and Pilcher, 1965 | Corresponding ΔfHºgas = -12.58 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
ΔcH°gas | -312.55 ± 0.20 | kcal/mol | Ccb | Crog and Hunt, 1942 | Corresponding ΔfHºgas = -12.18 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 58.078 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1965 |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
7.949 | 50. | Dorofeeva O.V., 1992 | p=1 bar. Selected values are in good agreement with other statistically calculated values [ Godnev I., 1948, Gunthard H., 1948, Kobe K.A., 1950, Sundaram S., 1963, Ramasamy R., 1978, Chao J., 1986].; GT |
7.954 | 100. | ||
8.083 | 150. | ||
8.650 | 200. | ||
10.45 | 273.15 | ||
11.24 ± 0.24 | 298.15 | ||
11.30 | 300. | ||
14.74 | 400. | ||
17.90 | 500. | ||
20.55 | 600. | ||
22.74 | 700. | ||
24.572 | 800. | ||
26.128 | 900. | ||
27.459 | 1000. | ||
28.602 | 1100. | ||
29.587 | 1200. | ||
30.440 | 1300. | ||
31.178 | 1400. | ||
31.821 | 1500. |
Constant pressure heat capacity of gas
Cp,gas (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
11.80 | 307.18 | Kistiakowsky G.B., 1940 | GT |
12.79 | 337.04 | ||
13.96 | 371.23 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 298. to 1200. | 1200. to 6000. |
---|---|---|
A | -5.558801 | 31.39300 |
B | 65.89381 | 3.299699 |
C | -45.16561 | -0.632185 |
D | 12.19730 | 0.042022 |
E | 0.092478 | -7.178870 |
F | -13.16720 | -37.85361 |
G | 34.12469 | 74.91099 |
H | -12.58010 | -12.58010 |
Reference | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in September, 1965 | Data last reviewed in September, 1965 |
Condensed phase thermochemistry data
Go To: Top, Gas phase thermochemistry data, Phase change 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 as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | -22.88 ± 0.30 | kcal/mol | Ccb | Moureu and Dode, 1937 | Reanalyzed by Cox and Pilcher, 1970, Original value = -22.8 kcal/mol; ALS |
Quantity | Value | Units | Method | Reference | Comment |
ΔcH°liquid | -301.85 ± 0.30 | kcal/mol | Ccb | Moureu and Dode, 1937 | Reanalyzed by Cox and Pilcher, 1970, Original value = -302.0 kcal/mol; Corresponding ΔfHºliquid = -22.88 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid | 35.719 | cal/mol*K | N/A | Giauque and Gordon, 1949 | DH |
Constant pressure heat capacity of liquid
Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
20.77 | 285. | Giauque and Gordon, 1949 | T = 15 to 283 K.; DH |
Phase change data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry 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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 283.7 | K | N/A | Majer and Svoboda, 1985 | |
Tboil | 286.15 | K | N/A | Moureu and Dode, 1937, 2 | Uncertainty assigned by TRC = 1.5 K; TRC |
Tboil | 283.85 | K | N/A | Timmermans and Hennaut-Roland, 1937 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tboil | 283.88 | K | N/A | Maass and Boomer, 1922 | Uncertainty assigned by TRC = 0.2 K; TRC |
Tboil | 286. | K | N/A | Von Auwers and Eisenlohr, 1910 | Uncertainty assigned by TRC = 4. K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 160.6 | K | N/A | McDonald, Shrader, et al., 1959 | Uncertainty assigned by TRC = 0.07 K; TRC |
Tfus | 161.45 | K | N/A | Timmermans and Hennaut-Roland, 1937 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tfus | 161.9 | K | N/A | Maass and Boomer, 1922 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 160.65 | K | N/A | Wilhoit, Chao, et al., 1985 | Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 160.65 | K | N/A | Giauque and Gordon, 1949, 2 | Uncertainty assigned by TRC = 0.02 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 468.9 | K | N/A | Walters and Smith, 1952 | Uncertainty assigned by TRC = 1.11 K; TRC |
Tc | 469.0 | K | N/A | Hess and Tilton, 1950 | Uncertainty assigned by TRC = 1. K; TRC |
Tc | 465.2 | K | N/A | Maass and Boomer, 1922 | Uncertainty assigned by TRC = 2. K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 71.38 | atm | N/A | Walters and Smith, 1952 | Uncertainty assigned by TRC = 0.6804 atm; TRC |
Pc | 70.97 | atm | N/A | Hess and Tilton, 1950 | Uncertainty assigned by TRC = 0.7485 atm; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 7.13 | mol/l | N/A | Walters and Smith, 1952 | Uncertainty assigned by TRC = 0.23 mol/l; TRC |
ρc | 7.26 | mol/l | N/A | Post, 1950 | Uncertainty assigned by TRC = 0.23 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 6.097 | kcal/mol | N/A | Majer and Svoboda, 1985 | |
ΔvapH° | 6.19 | kcal/mol | A | Stephenson and Malanowski, 1987 | Based on data from 283. to 385. K.; AC |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
6.1011 | 283.66 | N/A | Giauque and Gordon, 1949 | P = 101.325 kPa; DH |
6.104 | 283.7 | N/A | Majer and Svoboda, 1985 | |
6.41 | 269. | A | Stephenson and Malanowski, 1987 | Based on data from 239. to 284. K. See also McDonald, Shrader, et al., 1959, 2 and Dykyj, 1970.; AC |
6.41 | 269. | A | Stephenson and Malanowski, 1987 | Based on data from 223. to 284. K. See also Giauque and Gordon, 1949.; AC |
6.10 ± 0.06 | 283.66 | V | Giauque and Gordon, 1949, 3 | ALS |
6.43 | 290. | N/A | Moor, Kanep, et al., 1937 | Based on data from 268. to 313. K.; AC |
Entropy of vaporization
ΔvapS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.51 | 283.66 | Giauque and Gordon, 1949 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
182.59 to 283.59 | 4.380 | 1115.1 | -29.015 | McDonald, Shrader, et al., 1959, 2 | |
273.4 to 304.9 | 5.84125 | 2022.83 | 62.656 | Coles and Popper, 1950 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.2364 | 160.65 | Giauque and Gordon, 1949 | DH |
1.24 | 160.7 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
7.696 | 160.65 | Giauque and Gordon, 1949 | DH |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Pell and Pilcher, 1965
Pell, A.S.; Pilcher, G.,
Measurements of heats of combustion by flame calorimetry. Part 3.-Ethylene oxide, trimethylene oxide, tetrahydrofuran and tetrahydropy,
Trans. Faraday Soc., 1965, 61, 71-77. [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]
Crog and Hunt, 1942
Crog, R.S.; Hunt, H.,
Heats of combustion. II. The heats of combustion of ethyl methyl ketone and ethylene oxide,
J. Phys. Chem., 1942, 46, 1162-1163. [all data]
Dorofeeva O.V., 1992
Dorofeeva O.V.,
Ideal gas thermodynamic properties of oxygen heterocyclic compounds. Part 1. Three-membered, four-membered and five-membered rings,
Thermochim. Acta, 1992, 194, 9-46. [all data]
Godnev I., 1948
Godnev I.,
Thermodynamic functions of ethylene oxide,
Zh. Fiz. Khim., 1948, 22, 801-803. [all data]
Gunthard H., 1948
Gunthard H.,
Thermodynamic properties of ethylene oxide,
Helv. Chim. Acta, 1948, 31, 2128-2132. [all data]
Kobe K.A., 1950
Kobe K.A.,
Thermochemistry for the petrochemical industry. XIII. Some oxygenated hydrocarbons C1 and C2,
Petrol. Refiner, 1950, 29 (9), 135-138. [all data]
Sundaram S., 1963
Sundaram S.,
Thermodynamic functions of some propellants,
Z. Phys. Chem. (Frankfurt), 1963, 36, 376-377. [all data]
Ramasamy R., 1978
Ramasamy R.,
Centrifugal distortion constants and thermodynamic functions of ethylene oxide, ethylene oxide-d4, and ethylene sulfide,
Curr. Sci., 1978, 47, 668-669. [all data]
Chao J., 1986
Chao J.,
Thermodynamic properties of key organic oxygen compounds in the carbon range C1 to C4. Part 2. Ideal gas properties,
J. Phys. Chem. Ref. Data, 1986, 15, 1369-1436. [all data]
Kistiakowsky G.B., 1940
Kistiakowsky G.B.,
Gaseous heat capacities. III,
J. Chem. Phys., 1940, 8, 618-622. [all data]
Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G.,
Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]
Giauque and Gordon, 1949
Giauque, W.F.; Gordon, J.,
The entropy of ethylene oxide. Heat capacity from 14 to 285K. Vapor pressure. Heats of fusion and vaporization,
J. Am. Chem. Soc., 1949, 71, 2176-2181. [all data]
Majer and Svoboda, 1985
Majer, V.; Svoboda, V.,
Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]
Moureu and Dode, 1937, 2
Moureu, H.; Dode, M.,
Heats of Formation of Ethylene Oxide, of Ethandiol and oof Several Homologs,
Bull. Soc. Chim. Fr., 1937, 4, 637-47. [all data]
Timmermans and Hennaut-Roland, 1937
Timmermans, J.; Hennaut-Roland, M.,
Works from International Bureau at Physical-Chemical Standards. VIII. Physical constants of 20 organic compounds,
J. Chim. Phys. Phys.-Chim. Biol., 1937, 34, 693. [all data]
Maass and Boomer, 1922
Maass, O.; Boomer, E.H.,
Vapor Densities at Low Pressures and Over and Extended Temperature Range. I. The Properties of Ethylene Oxide Compared to Oxygen Compounds of Similar Molecular Weight,
J. Am. Chem. Soc., 1922, 44, 8, 1709-1728, https://doi.org/10.1021/ja01429a013
. [all data]
Von Auwers and Eisenlohr, 1910
Von Auwers, K.; Eisenlohr, F.,
Spectrochemical studies. I. Refraction & dispersion of hydrocarbon aldehydes, ketones, acids & esters with i pair of conjug. double bonds,
J. Prakt. Chem., 1910, 82, 65. [all data]
McDonald, Shrader, et al., 1959
McDonald, R.A.; Shrader, S.A.; Stull, D.R.,
Vapor Pressures and Freezing Points of 30 Organics,
J. Chem. Eng. Data, 1959, 4, 311. [all data]
Wilhoit, Chao, et al., 1985
Wilhoit, R.C.; Chao, J.; Hall, K.R.,
Thermodynamic Properties of Key Organic Compounds in the Carbon Range C1 to C4. Part 1. Properties of Condensed Phases,
J. Phys. Chem. Ref. Data, 1985, 14, 1. [all data]
Giauque and Gordon, 1949, 2
Giauque, W.F.; Gordon, J.,
The entropy of ethylene oxide heat capacity from 14 to 285c vapor pressure heats of fusion and vaporization,
J. Am. Chem. Soc., 1949, 71, 2176. [all data]
Walters and Smith, 1952
Walters, C.J.; Smith, J.M.,
Volumetric Behaviour and Thermodynamic Properties of Ethylene Oxide,
Chem. Eng. Prog., 1952, 48, 337. [all data]
Hess and Tilton, 1950
Hess, L.G.; Tilton, V.V.,
Ethylene Oxide - Hazards and Methods of Handling.,
Ind. Eng. Chem., 1950, 42, 1251-8. [all data]
Post, 1950
Post, R.G.,
, Unpublished Rep., Chem. Eng. No. 362, 1950. [all data]
Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw,
Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2
. [all data]
McDonald, Shrader, et al., 1959, 2
McDonald, R.A.; Shrader, S.A.; Stull, D.R.,
Vapor Pressures and Freezing Points of Thirty Pure Organic Compounds.,
J. Chem. Eng. Data, 1959, 4, 4, 311-313, https://doi.org/10.1021/je60004a009
. [all data]
Dykyj, 1970
Dykyj, J.,
Petrochemica, 1970, 10, 2, 51. [all data]
Giauque and Gordon, 1949, 3
Giauque, W.F.; Gordon, J.,
The entropy of ethylene oxide. Heat capacity from 14 to 285°K. Vapor pressure. Heats of fusion and vaporization,
J. Am. Chem. Soc., 1949, 71, 2176-21. [all data]
Moor, Kanep, et al., 1937
Moor, V.G.; Kanep, E.K.; Dobkin, I.E.,
Trans. Exptl. Research Lab. Khemgas, Materials on Cracking and Chemical Treatment of Cracking Products U.S.S.R., 1937, 3, 320. [all data]
Coles and Popper, 1950
Coles, K.F.; Popper, Felix,
Vapor-Liquid Equilibria. Ethylene Oxide - Acetaldehyde and Ethylene Oxide - Water Systems,
Ind. Eng. Chem., 1950, 42, 7, 1434-1438, https://doi.org/10.1021/ie50487a046
. [all data]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References
- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas Cp,liquid Constant pressure heat capacity of liquid Pc Critical pressure S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid Entropy of liquid at standard conditions Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature ΔcH°gas Enthalpy of combustion of gas at standard conditions ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔfusH Enthalpy of fusion ΔfusS Entropy of fusion ΔvapH Enthalpy of vaporization ΔvapH° Enthalpy of vaporization at standard conditions ΔvapS Entropy of vaporization ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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