Abstract
As a part of a study on C5-hydrocarbons, this paper deals with the liquid-liquid equilibrium in a ternary system consisting of isoprene, cyclopentadiene and (aqueous) N-methyl-pyrrolidone.
The experiments were carried out using four solvents; (anhydrous N-methylpyrrolidone and aqueous solutions), (12.7, 19.6, and 32.7wt% water), Temperatures were 2.0 (±0.3)°C and -8(±0.3)°C.
When the water-free N-methylpyrrolidone was used as solvent, both isoprene and cyclopentadiene were miscible in all proportions, but when the three aqueous solvents were used, isoprene and cyclopentadiene were partially miscible with solvent to form two liquid phases.
From the results obtained, it was confirmed that it was favourable for the extraction of cyclopentadiene to employ solvent containing much water, however, the considerable decrease of the solubilities of isoprene and cyclopentadiene in the solvent-rich phase also took place, and it would seem that the lower temperature is more favourable for extraction.
