Phenol cpds. prodn. by gas phase oxidn. of benzoic acid derivs. - using copper contg. catalyst with vanadium, silver, lithium or magnesium cpds. and cobalt co:catalyst

摘要

Prodn. of (un)substd. phenol cpds. (I) comprises oxidn. of the corresp. benzoic acid cpd. (II) in the gas phase in the presence of a catalyst comprising Cu and/or one or more Cu cpds., vanadium and/or one or more V cpds., and/or Ag and/or one or more Ag cpds., and/or Na and/or one or more Na cpds. and/or Mg and/or one or more Mg cpds., with an atomic ratio V/Cu of at most 1:2, Ag/Cu of at most 1:2, Li/Cu of at most 5:1, Na/Cu of at most 5:1 and Mg/Cu of at most 5:1, together with cobalt and/or one or more Co cpds. as cocatalyst with an atomic ratio Co/Cu of at most 1:10, and esp. 1:1000 to 3:40. The catalyst may also comprise 0-95 wt. (20-80) wt.% of a pref. silica-contg. carrier. The oxidn. is carried out pref. with a loading of 0.05-5, (0.1-2) pts.wt. (II) per pt.wt. catalyst per hour and at a temp. of 450-700 (500-650) K and a pressure of 50-2000 kPa. Presence of the Co cocatalyst gives considerable increase in conversion of (II) to the required phenol (I) cf. use of catalyst component only as described in EP--4045.