The growth kinetics of thiourea adducts formed with the guests of cycl
ohexane and methylcyclopentane (MCP) mixtures by adductive crystalliza
tion were studied in a batch cooling crystallizer. The effects of the
guest concentration on the growth rate and the dissolution rate of add
ucts were investigated. The growth rate of true crystal (thiourea) and
the inclusion rate of guests were also investigated and compared. The
method used to evaluate the crystal growth kinetics from the integral
mode batch experiments performed in a cooling crystallizer required t
he determination of the first two initial derivatives of supersaturati
on and temperature according to time. The orders of the growth for thi
ourea adducts with respect to supersaturation were found to be 0.87, 0
.86 and 0.84, and the activation energies of thiourea adducts were det
ermined as about 75.3, 68.3 and 60.7 kJ/mol for cyclohexane-thiourea a
dduct, cyclohexane-MCP-thiourea adduct, and MCP-thiourea adduct, respe
ctively. Furthermore, studies on the composition profile for guest and
host in the solution suggest that thiourea adduction is controlled by
the integration of thiourea molecules and not by the diffusion of the
guest molecules.