CA abstract: The title catalyst is composed of (by wt.%) CaO 10.0-30.0 and ZnO 70.0-90.0. The title method comprises (1) prepg. a 0.1-0.3 M Ca(NO3)2
soln., a 0.1-0.3 M Zn(NO3)2 soln. and a 10-25 vol.% ammonia soln., resp., (2) simultaneously dropping the Ca(NO3)2 soln., Zn(NO3)2 soln. and ammonia
soln. in a reactor, pptg. at pH 8.5-13 and 30-80, aging for 1-5 h, washing with water to neutrality, and filtering, and (3) drying at 90-110, and
calcining at 350-800 for 2-5 h. Salicylamide is synthesized by reacting urea with phenol at a molar ratio of 1 : (1-50) in the presence of 0.5-30
wt.% the catalyst at 100-250 for 2-24 h, dilg. and centrifuging. The method has the advantages of available raw materials, simple operation, high
selectivity, mild reaction conditions, etc. |