KINETIC-STUDY ON THIOUREA ADDUCTION WITH CYCLOHEXANE-METHYLCYCLOPENTANE SYSTEM .1. EQUILIBRIUM STUDY

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.