Back to results
US 4,900,704 AGranted
Peptized and phosphated inorganic oxides and catalysts supported on said oxides
AssigneePhillips Petroleum Company
InventorsMax P. McDaniel, Emory W. Pitzer, Floyd E. Farha, Jr.
Life of this patent
Estimating the term…
Abstract
Fine, pure, boehmite alumina crystallites are peptized, partially precipitated and phosphated, hardened, and dried to form a zerogel. The alumina can be impregnated with a chromium compound. The chromium-containing catalyst is activated by calcination. The activated catalyst can be used as a polymerization catalyst to polymerize mono-1-olefins.
Claims18
A process to make a phosphated alumina xerogel comprising:
- (a) peptizing fine, pure, boehmite alumina crystallites with a peptizing agent selected from the group consisting of nitric acid, aluminum nitrate, and mixtures thereof to form a clear solution;
- (b) adding a phosphating agent selected from the group consisting of phosphoric acid, ammonium phosphates, and mixtures thereof to said clear solution to form a partially precipitated, phosphated alumina;
- (c) further hardening said partially precipitated, phosphated alumina by neutralizing the clear solution with a base selected from the group consisting of ammonia, ammonium hydroxide, alkyl ammonium hydroxides, amines, and mixtures thereof;
- and
- (d) removing substantially all water from the thus further hardened precipitate to form a substantially water-free phosphated alumina xerogel.
2 more elements
A process to make a phosphated alumina xerogel comprising the steps of:
- (a) peptizing fine, pure, boehmite alumina crystallites with a peptizing agent selected from the group consisting of nitric acid, aluminum nitrate, and mixtures thereof to form a clear solution;
- (b) adding phosphoric acid to form a partially precipitated, phosphated alumina;
- (c) further hardening said partially precipitated, phosphated alumina by neutralizing the clear solution with ammonium hydroxide;
- (d) washing the thus further hardened phosphated alumina with isopropyl alcohol to form a substantially water-free precipitate;
- and
- (e) drying the substantially water-free precipitate to form a xerogel.
3 more elements
Dependencies are inferred from the claim text.