Cereal Chem 52:611 - 619.  |  VIEW ARTICLE
Sorption Kinetics and Equilibria of Carbon Tetrachloride on Wheat.

S. W. Park and B. G. Kyle. Copyright 1975 by the American Association of Cereal Chemists, Inc. 

Kinetic and equilibrium data for the sorption of carbon tetrachloride vapor on wheat kernels have been obtained for several levels of carbon tetrachloride partial pressure and over the temperature range 76 to 96 F. For all runs the moisture content of the wheat remained constant at 11.6% (dry basis). The equilibrium isotherm, although incompletely determined, appears to possess the sigmoid shape common to cereal products. Heats of sorption were estimated to range from 8.0 to 8.5 kcal/g mol. The kinetic data were well represented by an internal diffusion model with the diffusivity found to be approximately 1/25th of the published value for the diffusion of water vapor into the wheat kernel. The diffusivity exhibited an exponential temperature dependence with an activation energy comparable to that reported for water vapor.