EFFECTS OF WATER ON CATALYST PERFORMANCE FOR TOLUENE DISPROPORTIONATION AND TRANSALKYLATION

Abstract

Abstract: Toluene disproportionation and transalkylation reactions play an important role in the adjustment of aromatic resources and the reuse of inferior resources. The water content in feed affects the reactions significantly, however, it depends upon the upstream device and downstream storage environment with a large fluctuation range. The effect of water content on toluene disproportionation and transalkylation reaction was studied by using Ni modified zeolite catalyst. The results showed that within the testing range [w(H2O)<200 μg/g], the content of water had little influence on toluene disproportionation and transalkylation reaction of toluene and heavy aromatics. However, the water in the raw materials could reduce the metal reduction degree of the Ni hydrogenation active center, thereby reducing the hydrogenation activity of the catalyst and inhibiting the hydrodealkylation reaction of the side chain of heavy aromatics, thus reducing the processing capacity and overall conversion efficiency of the heavy aromatics. The inhibited hydrogenation activity would also reduce the hydrogenation of aromatic ring, so as to improve the quality of benzene product.

Key words: toluene disproportionation, transalkylation, dealkylation, heavy aromatics, hydrogenation, catalysis

CLC Number:

References

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