Methanethiol
- Formula: CH4S
- Molecular weight: 48.107
- IUPAC Standard InChIKey: LSDPWZHWYPCBBB-UHFFFAOYSA-N
- CAS Registry Number: 74-93-1
- 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: Methyl mercaptan; Mercaptomethane; CH3SH; Methyl sulfhydrate; Methyl thioalcohol; Mercaptan methylique; Methaanthiol; Methanthiol; Methvtiolo; Methylmercaptaan; Metilmercaptano; Rcra waste number U153; Thiomethanol; UN 1064; Methanethiole
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Phase change data
Go To: Top, Gas Chromatography, 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
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.
DH - Eugene S. Domalski and Elizabeth D. Hearing
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tboil | 279.1 ± 0.5 | K | AVG | N/A | Average of 6 values; Individual data points |
Quantity | Value | Units | Method | Reference | Comment |
Tfus | 150.18 | K | N/A | Morris, Lanum, et al., 1960 | Uncertainty assigned by TRC = 0.02 K; TRC |
Tfus | 150.1 | K | N/A | Teets, 1934 | Uncertainty assigned by TRC = 0.5 K; TRC |
Tfus | 150.1 | K | N/A | Ellis and Reid, 1932 | Uncertainty assigned by TRC = 0.4 K; TRC |
Tfus | 152.15 | K | N/A | Timmermans and Mattaar, 1921 | Uncertainty assigned by TRC = 0.6 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Ttriple | 150.14 | K | N/A | Russell, Osborne, et al., 1942 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.05 K; TRC |
Ttriple | 150.16 | K | N/A | Russell, Osborne, et al., 1942 | Crystal phase 1 phase; Uncertainty assigned by TRC = 0.03 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by disappearance of meniscus turbidity; TRC |
Tc | 469.9 | K | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.4 K; by appearance of turbidity; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 71.35 | atm | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.5000 atm; vapor pressure at Tc; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 6.891 | mol/l | N/A | Berthoud and Brum, 1924 | Uncertainty assigned by TRC = 0.04 mol/l; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ΔvapH° | 5.69 | kcal/mol | N/A | Reid, 1972 | AC |
ΔvapH° | 5.69 ± 0.02 | kcal/mol | V | Good, Lacina, et al., 1961 | ALS |
ΔvapH° | 5.71 | kcal/mol | N/A | Good, Lacina, et al., 1961 | DRB |
Enthalpy of vaporization
ΔvapH (kcal/mol) | Temperature (K) | Method | Reference | Comment |
---|---|---|---|---|
5.8719 | 279.12 | N/A | Russell, Osborne, et al., 1942, 2 | P = 101.325 kPa; DH |
6.50 | 223. | N/A | Dykyj, Svoboda, et al., 1999 | Based on data from 208. to 298. K.; AC |
6.02 | 359. | A | Stephenson and Malanowski, 1987 | Based on data from 267. to 359. K.; AC |
6.14 | 268. | A | Stephenson and Malanowski, 1987 | Based on data from 221. to 283. K.; AC |
5.66 | 360. | A | Stephenson and Malanowski, 1987 | Based on data from 345. to 424. K.; AC |
5.78 | 429. | A | Stephenson and Malanowski, 1987 | Based on data from 414. to 470. K.; AC |
6.17 | 264. | N/A | Stephenson and Malanowski, 1987 | Based on data from 222. to 279. K. See also Russell, Osborne, et al., 1942, 2.; AC |
Entropy of vaporization
ΔvapS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
21.04 | 279.12 | Russell, Osborne, et al., 1942, 2 | P; DH |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (atm)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
279.9 to 458. | 4.34810 | 1122.494 | -21.748 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
221.87 to 279.13 | 4.18630 | 1031.431 | -32.72 | Russell, Osborne, et al., 1942, 2 | Coefficents calculated by NIST from author's data. |
Enthalpy of fusion
ΔfusH (kcal/mol) | Temperature (K) | Reference | Comment |
---|---|---|---|
1.4 | 150.2 | Domalski and Hearing, 1996 | AC |
Entropy of fusion
ΔfusS (cal/mol*K) | Temperature (K) | Reference | Comment |
---|---|---|---|
0.380 | 137.6 | Domalski and Hearing, 1996 | CAL |
9.400 | 150.2 |
Enthalpy of phase transition
ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.05251 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942, 2 | DH |
1.411 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942, 2 | DH |
Entropy of phase transition
ΔStrs (cal/mol*K) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
---|---|---|---|---|---|
0.382 | 137.6 | crystaline, II | crystaline, I | Russell, Osborne, et al., 1942, 2 | DH |
9.398 | 150.16 | crystaline, I | liquid | Russell, Osborne, et al., 1942, 2 | DH |
Gas Chromatography
Go To: Top, 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 by: NIST Mass Spectrometry Data Center, William E. Wallace, director
Kovats' RI, non-polar column, isothermal
Column type | Active phase | Temperature (C) | I | Reference | Comment |
---|---|---|---|---|---|
Packed | SE-30 | 42. | 400. | Rudenko, Mal'tsev, et al., 1985 | Column length: 3. m |
Packed | Squalane | 60. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 80. | 401. | Zygmunt and Staszewski, 1981 | Chromosorb W DMCS; Column length: 2. m |
Packed | Squalane | 27. | 393. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 49. | 396. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 67. | 398. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Packed | Squalane | 86. | 401. | Hively and Hinton, 1968 | He, Chromosorb P; Column length: 15. m; Column diameter: 0.25 mm |
Van Den Dool and Kratz RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | HP-5MS | 464. | Bonaiti, Irlinger, et al., 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(8min) => 3C/min => 20C => 10C/min => 150C(10min) |
Capillary | HP-5 | 464. | Engel, Baty, et al., 2002 | 30. m/0.25 mm/0.25 μm, He; Program: 5C(5min) => 3C/min => 20C => 5C/min => 100C 15C/min => 150C (5min) |
Van Den Dool and Kratz RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-Wax | 643. | Wu and Cadwallader, 2002 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 10. K/min, 200. C @ 30. min |
Van Den Dool and Kratz RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | Supelcowax-10 | 694. | Majcher and Jelen, 2007 | 30. m/0.25 mm/0.25 μm; Program: 40C(2min) => 40C/min => 60C(2min) => 5C/min => 240C |
Capillary | Supelcowax-10 | 695. | Majcher and Jelén, 2005 | 30. m/0.25 mm/0.25 μm, He; Program: 40C(2min) => 40C/min => 60(2min)C => 5C/min => 240C |
Normal alkane RI, non-polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-5 | 473. | Cais-Sokolinska, Majcher, et al., 2011 | 25. m/0.20 mm/0.33 μm, Helium, 50. C @ 1. min, 20. K/min; Tend: 240. C |
Capillary | OV-101 | 414. | Zenkevich, 2005 | 25. m/0.20 mm/0.10 μm, N2/He, 6. K/min; Tstart: 50. C; Tend: 250. C |
Capillary | PONA | 414. | Yang, Wang, et al., 2004 | 50. m/0.20 mm/0.50 μm, N2, 2. K/min; Tstart: 35. C; Tend: 170. C |
Capillary | PONA | 460. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm, 2. K/min; Tstart: 30. C; Tend: 150. C |
Capillary | DB-1 | 430. | Hansen, Buttery, et al., 1992 | 30. C @ 25. min, 4. K/min, 200. C @ 20. min; Column length: 60. m; Column diameter: 0.32 mm |
Normal alkane RI, non-polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | DB-1 | 444. | Chantreau, Rochat, et al., 2006 | 20. m/0.18 mm/0.18 μm; Program: not specified |
Capillary | PONA | 461. | Yang, Wang, et al., 2003 | 50. m/0.20 mm/0.50 μm; Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich, 1998 | Program: not specified |
Capillary | Polydimethyl siloxanes | 414. | Zenkevich and Chupalov, 1996 | Program: not specified |
Capillary | SPB-1 | 414. | Nedjma and Maujean, 1995 | 30. m/0.32 mm/4. μm, H2; Program: 35(1)-10 -> 55-25 ->250 |
Capillary | DB-1 | 460. | Kawai, Ishida, et al., 1991 | 60. m/0.25 mm/0.25 μm; Program: not specified |
Normal alkane RI, polar column, temperature ramp
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | ZB-Wax | 688. | Marin, Pozrl, et al., 2008 | 60. m/0.32 mm/0.50 μm, Helium, 40. C @ 5. min, 4. K/min, 220. C @ 5. min |
Capillary | HP-Innowax | 640. | Senger-Emonnot, Rochard, et al., 2006 | 60. m/0.32 mm/0.5 μm, He, 2. K/min, 220. C @ 10. min; Tstart: 60. C |
Capillary | DB-Wax | 675. | Spadone, Matthey-Doret, et al., 2006 | 60. m/0.25 mm/0.25 μm, Helium, 35. C @ 3. min, 6. K/min, 240. C @ 10. min |
Capillary | TC-Wax | 702. | Ishizaki, Tachihara, et al., 2005 | 60. m/0.25 mm/0.25 μm, N2, 3. K/min, 220. C @ 40. min; Tstart: 70. C |
Capillary | TC-Wax | 700. | Ishikawa, Ito, et al., 2004 | 60. m/0.25 mm/0.5 μm, He, 40. C @ 8. min, 3. K/min; Tend: 230. C |
Capillary | DB-Wax | 690. | Kumazawa and Masuda, 2003 | 60. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 696. | Kumazawa and Masuda, 2003 | 30. m/0.25 mm/0.25 μm, He, 3. K/min; Tstart: 40. C; Tend: 210. C |
Capillary | DB-Wax | 655. | Cadwallader and Heo, 2001 | 30. m/0.53 mm/1. μm, He, 40. C @ 5. min, 6. K/min, 225. C @ 30. min |
Capillary | Supelcowax-10 | 668. | Girard and Durance, 2000 | 60. m/0.25 mm/0.25 μm, He, 35. C @ 10. min, 4. K/min; Tend: 200. C |
Capillary | DB-Wax | 679. | Schlüter, Steinhart, et al., 1999 | 60. m/0.32 mm/0.25 μm, He, 34. C @ 3. min, 5. K/min, 200. C @ 10. min |
Capillary | DB-Wax | 699. | Umano, Hagi, et al., 1995 | He, 40. C @ 2. min, 2. K/min; Column length: 60. m; Column diameter: 0.25 mm; Tend: 200. C |
Normal alkane RI, polar column, custom temperature program
Column type | Active phase | I | Reference | Comment |
---|---|---|---|---|
Capillary | TC-Wax | 702. | Kraft and Switt, 2005 | Program: not specified |
Capillary | TC-Wax | 702. | Tachihara, Ishizaki, et al., 2004 | Program: not specified |
References
Go To: Top, Phase change data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Morris, Lanum, et al., 1960
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The Heat Capacity, Entropy, Heats of Fusion, Transition and Vaporization and Vapor Pressures of Methyl Mercaptan,
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Notes
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- Symbols used in this document:
Pc Critical pressure Tboil Boiling point Tc Critical temperature Tfus Fusion (melting) point Ttriple Triple point temperature ΔHtrs Enthalpy of phase transition ΔStrs Entropy of phase transition 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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