Abstract：The work aims to solve the problem of uneven distribution of inlet temperature (Tin) and temperature rise (Trise) of each stage of the alkylation reactor in the ethylbenzene production unit based on the material of dilute ethylene. The SRK-Modified-Panag-Reid thermodynamic method was used to simulate the alkylation reaction process through PRO/II, and the effect of the number of stage, the first stage benzene/ethylene (R), and distribution coefficient (α) on Tin and Trise were systematically discussed. The results showed that the overall temperature rise of the reactor decreases with the increase of the number of stage. The Trise of the same stage first decreased and then increased with the increase of R. The Tin of the same stage decreased with the increase of α and the decrease of the dilute ethylene preheating temperature. Furthermore, the multi-stage fixed bed alkylation reaction process with variable quality feed preheating was proposed, and the optimal number of stages and the optimal feeding method were obtained, which could achieve the same Tin and Trise of each reactor stage.
