Kj. Kim et al., KINETIC-STUDY ON THIOUREA ADDUCTION WITH CYCLOHEXANE-METHYLCYCLOPENTANE SYSTEM .1. EQUILIBRIUM STUDY, Industrial & engineering chemistry research, 33(1), 1994, pp. 118-124
Ternary solid-liquid equilibrium diagrams of the systems methanol, thi
ourea and guests cyclohexane, methylcyclopentane (MCP), and their mixt
ures have been presented and discussed in the range between 30 and 60-
degrees-C. A study of phase diagrams reveals that thiourea could succe
ssfully be used for the separation of cyclohexane and MCP from nonarom
atic raffinate by adductive crystallization. Solubility limits for thi
ourea-cyclohexane adduct, thiourea-MCP adduct, and thiourea-MCP-cycloh
exane adduct in ternary liquid solutions were measured over the entire
feasible range of composition. Activity coefficients estimated for th
e saturation liquid solutions reflected strong positive deviation from
ideality. Adduct solubilities increase with increase in the concentra
tion of MCP guest and with increase in the temperature. In most cases
adduct was found to be able to be formed near room temperature. The pr
ocess of thiourea adduction, therefore, can be operated near room temp
erature.