under contract No. F33615-78-C-2075, and by the Division of Chemical Sciences, Office of Basic Energy Sciences, U.S. Department of Energy, under contract W-7405-eng-26 with the Union Carbide Corp. M.S. is grateful for financial assistance from Norges Teknisk-Naturvitenskapelige Forskningsrád. We note with thanks the technical assistance of J. Cobb and D. Goff, and helpful advice from J. Brynestad and C. A. Angelí.

al.13) extends from the melting to the boiling point of the mixture. Finally, we note that the phosphorus nucleus 31P is well suited for NMR studies. This work is in progress.Acknowledgment. This work was carried out in the laboratory of Prof. M. Kahlweit. I am indebted to him and to Dr. R. Strey for suggestion of the problem and advice with the experiments. I am further indebted to D. Luckmann for drawing the figures.

The time-dependent transmission of each adsorbate in binary mixtures of propane and n-butane and binary mixtures of n-butane and 1,3-butadiene in a helium carrier gas flowing through an adsorber bed packed with cross-linked polystyrene adsorbent was measured at both 273 and 298 K for a step-function increase in the input concentration. Transmission of an adsorbate is the ratio of the concentration at the bed outlet to that at the inlet. A mass-balance equation is used to extract the adsorption capacities. The transmission of propane exceeds unity for a limited time interval. This so-called "rollover" phenomenon occurs because the adsorption capacities of the two adsorbates in the mixture are unequal. The rollover phenomenon does not occur in the binary mixtures of n-butane and 1,3-butadiene because the adsorption capacities of the two adsorbates in this mixture are essentially equal. Adsorption isotherms of propane, n-butane, and 1,3-butadiene were determined from single-component transmission curves. Then binary adsorption isotherms were determined for both types of mixtures and were found to be represented by binary Freundlich isotherms.

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