Title: Pretreating process for the stabilization of a catalyst for the conversion of aromatic hydrocarbons

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.

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Inventors: Kamiyama, Setsuo (Ooi, JP)
Nagashima, Yukio (Wako, JP)
Furukawa, Hiroshi (Ooi, JP)
Kaneko, Katsumi (Ooi, JP)

Application Number: 867165
Filing Date: 1978-01-05
Publication_date: 1979-05-01
Assignee: Toa Nenryo Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Class(es): 502/62 502/78, 502/500
Other Classes:
US Patent Ref:

3792100	Feb, 1974	Sonoda et al.	260/668.
3873632	Mar, 1975	Pollitzer	260/668.
3907914	Sep, 1975	Willis et al.	260/668.

Other Refs:
Primary Examiner: Dees, Carl
Assistant Examiner:
Attorney: Yablonsky; Rebecca