Henry's Law Constants

Rolf Sander

Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany

Errata

Contact, Imprint, Acknowledgements

When referring to the compilation of Henry's Law Constants, please cite this publication:

R. Sander: Compilation of Henry's law constants (version 5.0.0) for water as solvent, Atmos. Chem. Phys., 23, 10901-12440 (2023), doi:10.5194/acp-23-10901-2023

The publication from 2023 replaces that from 2015, which is now obsolete. Please do not cite the old paper anymore.

Henry's Law Constants → Organic species with fluorine (F) → Organic fluorine → difluoromethane

FORMULA:	CH₂F₂
TRIVIAL NAME:	R32
CAS RN:	75-10-5
STRUCTURE (FROM NIST):
InChIKey:	RWRIWBAIICGTTQ-UHFFFAOYSA-N

$H_{s}^{cp}$	$d ln H_{s}^{cp} / d (1/ T)$	References	Type	Notes
[mol/(m³Pa)]	[K]
6.4×10⁻⁴	2100	Kutsuna (2017)	M	1)
6.8×10⁻⁴	2500	Anderson (2011)	M
3.0×10⁻⁴	3500	Miguel et al. (2000)	M
6.9×10⁻⁴	2400	Maaßen (1995)	M	600)
6.9×10⁻⁴	2300	Reichl (1995)	M	601)
7.9×10⁻⁴		Hayer et al. (2022)	Q	20)
1.8×10⁻⁴		Gharagheizi et al. (2012)	Q
8.4×10⁻⁴		Hilal et al. (2008)	Q
	2200	Kühne et al. (2005)	Q
3.1×10⁻²		Yaffe et al. (2003)	Q	249) 250)
	2400	Kühne et al. (2005)	?
8.6×10⁻⁴		Yaws (1999)	?	21)
8.6×10⁻⁴		Yaws and Yang (1992)	?	21)

Data

The first column contains Henry's law solubility constant

H_{s}^{cp}

at the reference temperature of 298.15 K.
The second column contains the temperature dependence

d ln H_{s}^{cp} / d
(1/ T)

, also at the reference temperature.

References

Anderson, G. K.: A thermodynamic study of the (difluoromethane + water) system, J. Chem. Thermodyn., 43, 1331–1335, doi:10.1016/J.JCT.2011.03.020 (2011).
Gharagheizi, F., Eslamimanesh, A., Mohammadi, A. H., & Richon, D.: Empirical method for estimation of Henry’s law constant of non-electrolyte organic compounds in water, J. Chem. Thermodyn., 47, 295–299, doi:10.1016/J.JCT.2011.11.015 (2012).
Hayer, N., Jirasek, F., & Hasse, H.: Prediction of Henry’s law constants by matrix completion, AIChE J., 68, e17 753, doi:10.1002/AIC.17753 (2022).
Hilal, S. H., Ayyampalayam, S. N., & Carreira, L. A.: Air-liquid partition coefficient for a diverse set of organic compounds: Henry’s law constant in water and hexadecane, Environ. Sci. Technol., 42, 9231–9236, doi:10.1021/ES8005783 (2008).
Kühne, R., Ebert, R.-U., & Schüürmann, G.: Prediction of the temperature dependency of Henry’s law constant from chemical structure, Environ. Sci. Technol., 39, 6705–6711, doi:10.1021/ES050527H (2005).
Kutsuna, S.: Experimental determination of Henry’s law constants of difluoromethane (HFC-32) and the salting-out effects in aqueous salt solutions relevant to seawater, Atmos. Chem. Phys., 17, 7495–7507, doi:10.5194/ACP-17-7495-2017 (2017).
Maaßen, S.: Experimentelle Bestimmung und Korrelierung von Verteilungskoeffizienten in verdünnten Lösungen, Ph.D. thesis, Technische Universität Berlin, Germany, ISBN 3826511042 (1995).
Miguel, A. A. F., Ferreira, A. G. M., & Fonseca, I. M. A.: Solubilities of some new refrigerants in water, Fluid Phase Equilib., 173, 97–107, doi:10.1016/S0378-3812(00)00390-3 (2000).
Reichl, A.: Messung und Korrelierung von Gaslöslichkeiten halogenierter Kohlenwasserstoffe, Ph.D. thesis, Technische Universität Berlin, Germany (1995).
Yaffe, D., Cohen, Y., Espinosa, G., Arenas, A., & Giralt, F.: A fuzzy ARTMAP-based quantitative structure-property relationship (QSPR) for the Henry’s law constant of organic compounds, J. Chem. Inf. Comput. Sci., 43, 85–112, doi:10.1021/CI025561J (2003).
Yaws, C. L.: Chemical Properties Handbook, McGraw-Hill, Inc., ISBN 0070734011 (1999).
Yaws, C. L. & Yang, H.-C.: Henry’s law constant for compound in water, in: Thermodynamic and Physical Property Data, edited by Yaws, C. L., pp. 181–206, Gulf Publishing Company, Houston, TX, ISBN 0884150313 (1992).

Type

Table entries are sorted according to reliability of the data, listing the most reliable type first: L) literature review, M) measured, V) VP/AS = vapor pressure/aqueous solubility, R) recalculation, T) thermodynamical calculation, X) original paper not available, C) citation, Q) QSPR, E) estimate, ?) unknown, W) wrong. See Section 3.1 of Sander (2023) for further details.

Notes

1)	A detailed temperature dependence with more than one parameter is available in the original publication. Here, only the temperature dependence at 298.15 K according to the van 't Hoff equation is presented.
20)	Calculated using machine learning matrix completion methods (MCMs).
21)	Several references are given in the list of Henry's law constants but not assigned to specific species.
249)	Yaffe et al. (2003) present QSPR results calculated with the fuzzy ARTMAP (FAM) and with the back-propagation (BK-Pr) method. They conclude that FAM is better. Only the FAM results are shown here.
250)	Value from the training set.
600)	The data from Maaßen (1995) were fitted to the three-parameter equation: H_s^cp= exp( −163.70243 +8973.31702/T +22.17142 ln(T)) mol m⁻³ Pa⁻¹, with T in K.
601)	The data from Reichl (1995) were fitted to the three-parameter equation: H_s^cp= exp( −142.70480 +8025.53525/T +19.04459 ln(T)) mol m⁻³ Pa⁻¹, with T in K.

The numbers of the notes are the same as in Sander (2023). References cited in the notes can be found here.

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