Patent ID: 6518219
Filing Date: 2003-02-11
Classification: B01J,C10G

Abstract:
A catalyst for hydrofining fraction oils, comprising an alumina carrier and at least one metal and/or thereof oxide of Group VIB and at least one metal and/or thereof oxide of Group VIII supported on the alumina carrier wherein the pore volume of said alumina carrier is not less than 0.35 ml/g, in which the pore volume of the pores having a diameter of 40-100 angstrom accounts for more than 80% of the total pore volume, and wherein said alumna carrier is prepared by one of the following processes, wherein:Process 1 comprises steps as follow: 1) contacting a solution of sodium meta-aluminate or sodium aluminate with one or more of the solutions of aluminium sulfate, aluminium nitrate, aluminium chloride, nitric acid and sulfuric acid to carry out the primary precipitation reaction under a pH value range of from 6 to 9.5 and a temperature range of from 10 to 100Â° C.; 2) reacting the resultant of step 1) with one or more of alkali carbonate, a mixed solution of alkali bicarbonate and aqueous ammonia ammonium carbonate and ammonium bicarbonate to carry out the secondary precipitation reaction under a pH value range of from 9.0 to 10.5; and 3) aging the aluminium hydrate obtained from the step 2), separating solid from liquid, and washing, drying and calcining the obtained solid resultant, and Process 2 comprises steps as follow: 1) contacting a solution of sodium meta-aluminate or sodium aluminate with a gas containing carbon dioxide to carry out precipitation, wherein the pH value in the course of said precipitation is controlled in the range of 6-9.5, the time of said precipitation reaction is less than 40 minutes, the temperature of said precipitation reaction is 10-100Â° C.; 2) as soon as said precipitation reaction is ended a basic substance is added promptly so as to make the pH value of the slurry rise to higher than 9.5 or quickly carry out the separation of the solid from liquid and washing; and 3) aging the aluminium hydrate obtained from step 2); separating solid from liquid and washing, drying, and calcining the obtained solid resultant.