Abstract
The kinetics of chloroform extraction from a Jordan tar sand have been studied. The activation energy of the extraction has been evaluated; for 125–180 μm tar sand it is 6⋅53 kJ mol−1 in the initial stage of extraction and 12⋅18 kJ mol−1 in the later stages, for 355–500 μm 1⋅0 kJ mol−1 and 10⋅61 kJ mol−1, respectively. These values are in agreement with the general activation energy of the dissolution of a solid material. It is concluded that the rate of extraction is controlled by the diffusion of extract. © 1997 by John Wiley & Sons, Ltd.
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