Extractive Distillation Approach to the Separation of Styrene from Pyrolysis Gasoline Feedstock Coupled with Deep Desulfurization

The separation of mixtures with close boiling points is a critical task in the petrochemical industry, and one such mixture that requires o-xylene/styrene. STED process used to separate o-xylene/styrene, which contains certain amount organic sulfur product due limitations process. In this study, underwent enhancements attain effective styrene accomplish deep desulfurization. A sulfolane (SUL) N-methylpyrrolidone (NMP) was selected as extraction solvent after calculating UNIFAC group contributions. An orthogonal experiment conducted investigate effects solvent/oil ratio, reflux water addition rate, ratio on product. correspondence between each factor indexes examined determined, enabling optimization prediction quality. final optimized conditions for extractive distillation column are follows: 7, 4.5, rate 6000 kg/h, 9:1. Under optimal conditions, purity observed be greater than original content can reduced lower 10 ppm at cost an increase 12.31% energy consumption.