IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Ethane with Propane, n-Butane and Ethyl Cellulose (EC)

Components:
   (1) Ethane with Propane, n-Butane; C2H6, C3Hg, C4H10; [115-07-1, 74-98-6, 106-97-8]  NIST Chemistry WebBook for detail
   (2) Ethyl Cellulose (EC); ; [9004-57-3]  NIST Chemistry WebBook for detail

Original Measurements:
   E. Casur and T.G. Smith, J. Appl. Polym. Sci. 31, 1425 (1986).

Variables:
   Temperature = 303 K - 343 K
   Pressure = 0-26 kPa

Prepared By:
   A.K. Bokarev

Experimental Remarks:

   (For Tables 3, 4 and 5, the original data were represented graphically.)

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)

Table 1. Dual mode sorptino parameters for various gases in ethyl cellulose
T/K	Chemical Name	Henry's law constant, K [cm³(STP)/cm³ atm]	Langmuir's parameter, C_H [cm³(STP) cm^-3]	Affinity Coefficient b [atm^-1]
303	C2H6	0.0476	0.348	0.0349
313	C2H6	0.0378	0.300	0.0307
323	C2H6	0.0295	0.299	0.0225
333	C2H6	0.0248	0.280	0.0179
343	C2H6	0.0199	0.250	0.0169
349	C2H6	0.1181	0.303	0.4251
303	C3H8	0.1319	0.479	0.2914
313	C3H8	0.1012	0.295	0.2601
323	C3H8	0.0769	0.217	0.2347
333	C3H8	0.0613	0.096	0.3280
343	C3H8	0.0493	0.089	0.3267
303	C4H10	0.2282	3.718	0.3128
313	C4H10	0.1884	2.650	0.2684
323	C4H10	0.1635	1.577	0.2645
333	C4H10	0.1439	0.809	0.3043
343	C4H10	0.1181	0.303	0.4251

Table 2. Heats of sorption in ethyl cellulose (kcal/mol). Values obtained from van't Hoff plots for k, b and the solubility coefficients S (S=k - C' b), respectively
Chemical Name	Enthalpy [kcal/mol]	Remark(s)
Ethane	-4.68	delta H
Propane	-7.13	delta H
n-Butane	-8.46	delta H

Table 3. Sorption isotherms of n-butane in ethyl cellulose
T/K	Pressure [kPa]	Sorption [(V₁(STP)/V₂)]
303	1.81	1.43
303	3.11	1.99
303	4.36	2.46
303	5.75	2.97
303	7.09	3.42
303	9.86	4.19
303	12.55	4.87
303	15.27	5.48
303	18.00	6.03
303	21.93	6.83
303	26.09	7.63
313	1.76	0.93
313	3.10	1.36
313	4.44	1.78
313	5.79	2.15
313	7.08	2.48
313	9.81	3.05
313	12.44	3.61
313	15.21	4.09
313	17.94	4.60
313	21.91	5.24
313	25.93	5.83
323	1.76	0.61
323	2.96	0.91
323	4.44	1.20
323	5.73	1.48
323	7.07	1.71
323	9.75	2.19
323	12.39	2.59
323	15.16	2.99
323	17.79	3.34
323	21.86	3.93
323	25.97	4.46
333	1.71	0.38
333	3.05	0.63
333	4.21	0.82
333	5.59	1.03
333	6.93	1.22
333	9.61	1.55
333	12.38	1.87
333	15.20	2.19
333	17.83	2.51
333	21.80	2.98
333	25.87	3.45
343	1.66	0.26
343	2.96	0.42
343	4.25	0.57
343	5.77	0.71
343	6.97	0.81
343	9.70	1.09
343	12.38	1.35
343	15.15	1.61
343	17.78	1.85
343	21.89	2.19
343	25.90	2.57

Table 4. Sorption isotherms of ethane in EC at various temperatures
T/K	Pressure [kPa]	Sorption [(V₁(STP)/V₂)]
303	2.99	0.11
303	5.67	0.23
303	8.33	0.36
303	11.02	0.47
303	13.63	0.58
303	17.65	0.74
303	25.87	1.08
333	2.99	0.07
313	2.88	0.09
313	5.60	0.19
313	8.40	0.29
313	11.02	0.38
313	13.68	0.46
313	17.66	0.59
313	25.84	0.85
323	2.80	0.08
323	5.64	0.15
323	8.30	0.22
323	10.99	0.29
323	13.65	0.36
323	17.63	0.46
323	25.82	0.66
333	5.61	0.12
333	8.26	0.18
333	10.92	0.24
333	13.50	0.29
333	17.56	0.38
333	25.82	0.55
343	2.95	0.06
343	5.57	0.10
343	8.26	0.14
343	11.03	0.20
343	13.50	0.23
343	17.60	0.30
343	25.72	0.44

Table 5. Sorption isotherms of propane in EC at various temperatures
T/K	Pressure [kPa]	Sorption [(V₁(STP)/V₂)]
303	4.40	0.60
303	5.77	0.81
303	7.10	0.99
303	9.80	1.31
303	12.51	1.61
303	15.17	1.92
303	17.83	2.17
303	21.94	2.56
303	25.94	2.92
313	4.37	0.44
313	5.62	0.57
313	7.07	0.72
313	9.81	0.92
313	12.43	1.20
313	15.14	1.39
313	17.80	1.60
313	21.84	1.92
313	25.98	2.22
323	5.74	0.42
323	8.37	0.60
323	11.07	0.78
323	13.81	0.97
323	17.80	1.20
323	21.80	1.44
323	25.99	1.68
333	5.70	0.30
333	8.33	0.45
333	11.03	0.58
333	13.73	0.71
333	17.73	0.91
333	21.88	1.09
333	25.95	1.28
343	5.66	0.25
343	8.33	0.34
343	10.92	0.46
343	13.70	0.57
343	17.66	0.73
343	21.84	0.88
343	25.95	1.05

Method/Apparatus/Procedure:
   Sorption was determined by a gravimetric method using a Calm microbalance (Model KG). Corrections were made for buoyancy effects.

Source and Purity of Materials:
   Gases: purity 99.99 %. EC (Ethocel 10 cp): Dow Chemical Co., contained 48 %—49.5 % ethoxy groups, density 1.13 g/cm³, glass transition temperature 396 K.

Estimated Errors:

   Temperature: No information given.