XIV.—The Thermal Equilibrium between Ethylene, Iodine, and Ethylene Di-iodide

Abstract

The pressure of ethylene in equilibrium with solid iodine and solid ethylene di-iodide was measured at temperatures between 10°C and 65°C.The vapour pressure of undissociated ethylene di-iodide was measured at four temperatures between 15°C and 55° C.From these results and the known vapour pressure of iodine equilibrium constants were calculated.Some experiments were made on the rate of formation and decomposition of ethylene di-iodide.We desire to thank Professor Sir James Walker and Professor Kendall for their interest in our work, and Imperial Chemical Industries, Ltd., for a grant towards the cost of apparatus.