Comparative studies with n-methyl-2-pyrrolidone and furfural as solvents for extraction of lube distillates

Abstract

Solvent Extraction of spindle raw lube distillate from Oman crude using n-methyl pyrrolidone (NMP) containing 1.5wt.% water has been studied using a six-stage all-glass mixer-settler. Results of three operating temperatures with NMP are reported. A 65-55°C extraction temperature appears to be most appropriate for this stock. Data obtained at this temperature have been compared with those for furfural on the basis of phase boundary curves, extraction and lube refining indices and selectivity. Comparison of the results shows NMP to be more selective as far as raffinate yield is concerned. It requires lower operating solvent-to-feed ratios and lower temperatures.