Pretreating process for the stabilization of a catalyst for the

Details Pretreating process for the stabilization of a catalyst for the Pretreating process for the stabilization of a catalyst for the

1978-01-05

1979-05-01

Dees, Carl

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

B01J 2906

Patent

active

041522974

ABSTRACT:
A method of stabilizing a catalyst for the conversion of aromatic hydrocarbons in the presence of hydrogen such as the isomerization of C.sub.8 aromatic hydrocarbons to increase the content of p-xylene, is carried out by contacting a catalyst in advance of start-up with hydrocarbons in the liquid phase at a temperature preferably of about 50.degree. to about 250.degree. C. and preferably at elevated pressure up to about 50 Kg/cm.sup.2 in the absence of hydrogen; the catalyst being prepared by the acid leaching of a hydrogen form mordenite to produce a mordenite having a silica to alumina molar ratio of about 15 to 21. Preferably, the hydrocarbons used for the contacting have the composition of the feed to be converted.

REFERENCES:
patent: 3792100 (1974-02-01), Sonoda et al.
patent: 3873632 (1975-03-01), Pollitzer
patent: 3907914 (1975-09-01), Willis et al.

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