Optimization of aviation kerosene from one-step hydrotreatment of catalytic Jatropha oil over SDBS-Pt/SAPO-11 by response surface methodology

Abstract

The Pt/SAPO-11 was modified by sodium dodecyl benzene sulfonate (SDBS) to synthesize a new catalyst SDBS-Pt/SAPO-11 firstly. And then, the structure of SDBS-Pt/SAPO-11 was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), N2 adsorption-desorption and transmission electron microscopy (TEM). Aviation kerosene was produced by one-step hydro treatment with Jatropha oil as raw material in a high-pressure fixed-bed reactor over SDBS-Pt/SAPO-11. Based on the Box-Behnken central composite design, maintenance temperature, pressure, liquid hourly space velocity (LHSV) and hydrogen/oil ratio (hydrogen volume/Jatropha oil volume) were chosen as the four important factors with three levels. The process conditions were optimized by response surface methodology (RSM), and a mathematical model with a second order quadratic equation was developed for increasing C8–C16 hydrocarbons. The optimized conditions were found to be a temperature at 410 °C, a pressure at 5 MPa, the LHSV at 1.2 h−1 and the hydrogen/oil ratio at 1000 NmL·mL−1 as the best operating conditions. The verification experiment was carried out 3 times and the selectivity of C8–C16 hydrocarbons was found to be 59.51%, and the selectivity of C8–C16iso-alkanes was found to be 25.41%.