Ethylphosphonic acid, 85 percent orthophosphoric acid and aluminum nitrate were dissolved in water and pH was increased to 5 by ammonia water; precipitates were formed which were separated by filtration and dried; 10 percent alumina sol was added and catalyst calcined at 250 C for 3 hours to give a molded, weakly acidic solid catalyst T=200°C; P=3750.38 Torr;
Ethylphosphonic acid, 85 percent orthophosphoric acid and aluminum nitrate were dissolved in water and pH was increased to 5 by ammonia water; precipitates were formed which were separated by filtration and dried; 10 percent alumina sol was added and catalyst calcined at 250 C for 3 hours to give a molded, weakly acidic solid catalyst T=200°C; P=7500.75 Torr;
Weil et al.
Org.Synth.Coll.Vol., 1963 , vol. IV, p. 862,864
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Stirton et al.
Journal of the American Oil Chemists' Society, 1952 , vol. 29, p. 198,199
