Optimization of Two-Stage Pygas Hydrogenation Reactor Based on Hydrogen Network Integration

Abstract

A graphical method is proposed to optimize the two-stage pyrolysis gasoline (pygas) hydrogenation reactor based on the hydrogen network integration. The relation between the hydrogen utility adjustment (HUA) and the parameters of pyrolysis gasoline (pygas) hydrogenation reactor in different situations is deduced based on the hydrogenation reaction kinetics and integration of hydrogen network, and the variation of HUA with temperature is analyzed with the proposed quantitative diagrams. Based on this method, the temperature of first-stage and second-stage reactors can be optimized separately or simultaneously, and the product quality can be taken into consideration to make the results more accurate. The case study shows that this method can identify the optimal reaction temperature in each stage reactor accurately under different conditions and can give significant guidance for pygas hydrogenation unit design and improvement.

Simulation and Modeling-Based Refinery Hydrogen Network Integration with Process Risk Analysis

“…employed sulfur removal-based hydrotreating reaction kinetics in a mathematical model and operational optimization. Huang and Liu proposed a graphical approach for hydrogen network integration with hydrogen separation from product oil (OIL-PRO) based on a thermodynamic equation of state and they further developed a pygas hydrogenation reaction kinetics-based graphical method to target hydrogen utility as the reaction temperature. Zhang et al introduced thermodynamic principles into a mathematical model for total exergy minimization of hydrogen networks with sulfur content variations.…”