Optimization and lumped kinetic model study of coal-based aerospace kerosene hydrogenation process

Abstract

The effects of various factors on the hydrodegumming (HDG) of oil during the deep hydrogenation of coal-based aerospace kerosenee (CBAK) were studied by single factor experiment and response surface methodology (RSM) analysis on a fixed-bed hydrogenation unit with the existent gum content as the observation value. The results show that in order to achieve better HDG effect of CBAK, it must be carried out at high reaction temperature (T), high reaction pressure (P) and low liquid hourly space velocity (LHSV). The influence of various factors on the gum content of hydrogenated oil was analyzed by using the Design Expert software. The influence degree order was as follows: LHSV > P > T. At the same time, the process conditions of deep hydrogenation were optimized by simulation: P = 11.91 MPa, LHSV = 1.60 h−1, V(H2)/V(Oil) = 800, T = 619.84 K, under which the expected gum content was 0.26 mg (100 mL)−1. On this basis, according to the speed of CBAK-HDG reactivity, the existent gum in the raw material were divided into three lumps, which are high reactivity, medium reactivity, and slow reactivity, then the three lumped kinetic model of CBAK-HDG was established. The kinetic parameters of the model were calculated by Levenberg–Marquardt method, and the model was verified by the measured data. The experimental results show that the average relative error of the model is 8.28%, the predicted value is reliable and the extrapolation is quite good. The calculation results of the model parameters correspond to the results of RSM, which is consistent with the hydrogenation reaction law. The results of this study are expected to provide some theoretical basis and reference for the further study of coal-based space kerosene hydrofining process and the optimization of operation conditions of industrial units.