Method for producing activated alumina catalyst
AssigneeSolv-Ex Corporation
InventorsJohn S. Rendall, Massoud Ahghar, Stephen J. Lane
Life of this patent
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Abstract
A method of making activated alumina including the steps of dissolving a double salt of aluminum in a solution of pure water at 85.degree. C., recrystalizing the double salt at a pressure about 250 psi and temperature ranging from 200.degree. C. to 250.degree. C., precipitating out the purified basic double salt, drying the precipitated double salt to drive off water and roasting it at 850.degree. C. to 950.degree. C. to drive off the sulfate, washing to remove the potassium sulfate and then drying the remaining alumina to yield activated alumina for use as a high-grade catalyst.
Claims6
A method for producing activated alumina suitable for use as a catalyst, comprising the steps of:
- (a) dissolving a double salt of aluminum potassium sulfate Al.sub.2 K.sub.2 (SO.sub.4).sub.4 in a solution;
- (b) heating and pressurizing the resulting solution in a pressure vessel to crystallize and precipitate out a crystal material from said solution;
- (c) drying and calcining said crystal material to produce a combination of alumina and potassium sulfate;
- (d) washing with water to remove said potassium sulfate from said combination of alumina and potassium sulfate;
- and
- (e) drying said alumina remaining after the step of washing to produce an activated alumina.
A method of making activated alumina including the steps of:
- dissolving a double salt of aluminum potassium sulfate Al.sub.2 K.sub.2 (SO.sub.4).sub.4 in a solution of water at 85.degree. C.;
- recrystallizing a double salt of aluminum potassium sulfate by subjecting said solution to a temperature of 65.degree. C.;
- removing said double salt of aluminum potassium sulfate recrystallized in the preceding step and adding water to said recrystallized double salt;
- increasing the pressure applied to said double salt and added water to approximately 250 psi and increasing the temperature to 200.degree. C. to 250.degree. C.;
- precipitating out a purified material from said heated and pressurized double salt and added water;
- drying said purified material precipitated in the previous step to drive off water and roasting it at 850.degree. C.-950.degree. C. to drive off SO.sub.3 ;
- washing said dried and calcined purified material with water to remove soluble potassium sulfate, thereby forming an alumina product;
- and
- drying said alumina product to yield a catalyst form of activated alumina.
Dependencies are inferred from the claim text.