Co-Processing Pyrolysis oil in Hydrocracking and Fluid Catalytic Cracking Unit to Produce Liquid Fuel and Its Techno-Economic Analysis
Transportation sector is commonly the largest consumer of liquid fuel. As sustainability is imminent concern, liquid fuel production from biomass waste is of a great interest. The most promising intermediate biomass derivative is pyrolysis oils. It can be co-processing with vacuum gas oil (VGO) and light vacuum gas oil (LVGO) in fluid catalytic cracking (FCC) and hydrocracking (HC) unit of a petroleum refinery to produce gasoline. Commercial scale of such co-processing has not been performed. Thus, it is important to develop surrogate model to estimate the product yields of those processes. This paper aims to develop surrogate models for HC and FCC unit based on Aspen Plus simulation. A techno-economic analysis is also performed using generic algebraic modeling system (GAMS) to optimize the profit of this co-processing. The optimization results show that among for different alternatives of pyrolysis oils, the highest profit is obtained when hydrodeoxygenated pyrolysis oil of empty fruit bunches (HDOEFB) is co-processed with VGO and LVGO. For FCC operation, the optimum weight ratio of HDOEFB to VGO is 0.2 and the optimum reaction temperature is 505 oC. While for HC operation, the optimum weight ratio is 0 and the optimum reaction temperature is 370 oC. The ratio of 0 for HC operation implies that only light vacuum gas oil is processed with no addition of HDOEFB.
Keywords - Liquid Fuel, Biomass Waste, Pyrolysis Oils, Hydrocracking, Fluid Catalytic Cracking, Surrogate Model, Optimization