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.