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INDUSTRIAL AND ENGINEERING CHEMISTRY
example of this phenomenon. Lacey and Sage (6) have suggested the possibility t h a t a fourth phase exists in this region. Typical loci of bubble points against total carbon dioxide for the two fixed quantities of hydrocarbon and sodium chloride solution employed are shown in Figures 3 and 4 for. systems corresponding to curves 3 and 2 of Figure 2, respectively. Table I wmmarizeq the data obtained for the five systems. The solubility of carbon dioxide in each of the two liquid phase. is obtained from the two curves of carbon dioxide content against bubble point pressure. For example, t o determine the solubilities of carbon dioxide in aqueou.; sodium chloride solution and benzene at 40" C. and 50 atmospheres, reference is made t o Figure 3. For the system n i t h 51.70 grams of brine and 4.39 grams of benzene, the total carbon dioxide in solution is 3.67 grams, and for the system with 5 17 grams of brine and 4.39 grams of benzene, the total carbon dioxide in solution is 2.55 grams. Let c1 be grain? of carbon dioxide per gram of sodium chloride solution, and c2 be grams of carbon dioxide per gram ot benzene. Neglecting the solubilities of water and sodium chloride in the hydrocarbon-rich phase, and of hydrocarbon in the aqueous phase, these concmtrations map be evalual ed b\ simultaneous soltions:
for each system. The distributioii c:oeficients of carboii dioxide between the aqueous and hydrocarbon phases are shown a140 at intervals of 5 atmosphere pressure in Table 11. These data, are shown graphically in Figure 7 for the five systems studied. The benzene data of Figure 6 are in excellent agreement with those of Wan and Dodge ( 1 1 ) . Poettmann arid Katz (8) show a somewhat higher solubility of carbon dioxide at 100' F. (37.77 " C . ) for a given pressure than is shown in Figure 6. ACKKOWLEUGMENT
The financial support of the Research Corporation through w Frederick Gardner Cottrell grant-in-aid in support of this project is gratefully acknowledged. A. P. Buthod of the University of Tulsa has contributed mnnv helpful suggestions in t h c b p u i suance of this work. LI'rEHATURE CITED
dlbright, J. C., Refiner .Yutural Gasoline M f r . , 11, No, 1, p. 10 (1932). Cherepennikov, A . A . , Neftyanoe Khoz., 18, No. 2, p. 68 (1937; Dobbin, C . E.sBzcZZ. d m Assoe. Petroleum Geol., 27, 417 (1U4:i,. Dommer, O.,Arch. Wtirmewirt.,8, 216 (1927). Hubbard,H. C., Calif. J . Mines Geol., 39 (1943). Lacev, W. N., and Sage, B. H., private communicationh. MacKenzie, V. V., Ann. phys., 2 , No. 1,p. 450 (1877) Poettmann, F. H.: anti Kat,%,D. L., IND.ENG.CHICXI.. 37, !i (2945). Sander, W., 2. physik chein., 78, 613 (1912). Schmidt-Xielsen, J., Ann. A c u r i . S c i . Fennicae, S p y . A , 29. No. 12 (1927). Wan, Shen-Wu, and Dodge, H. I
