Alumina supporter and preparation method thereof

Abstract

The invention relates to an alumina carrier and a preparation method thereof. The pore distribution of the alumina carrier is as follows: the pore volume of holes with the pore diameter of less than 10 nanometers accounts for less than 10 percent of the total pore volume; the pore volume of holes with the pore diameter between 10 and 50 nanometers accounts for 40 to 80 percent of the total pore volume; the pore volume of holes with the pore diameter between 100 and 1,000 nanometers accounts for 1 to 40 percent of the total pore volume; and the pore volume of holes with the pore diameter between 5,000 and 10,000 nanometers accounts for 1 to 20 percent of the total pore volume. The preparation method for the alumina carrier comprises: adopting a small quantity of starch and / or carbon black as crystal seeds, adopting a method of co-current flow first and swing then to prepare a serum containing aluminum hydroxide, using ammonium carbonate and / or ammonium bicarbonate to adjust the pH value, and finally preparing the alumina carrier. Alumina obtained by the method still maintains high strength under the condition of enlarged pore volume and pore diameter. The alumina carrier is particularly suitable to be a carrier of a residual oil hydrotreating catalyst.

Description

technical field [0001] The invention relates to an alumina carrier and a preparation method thereof, in particular to a macroporous alumina carrier used as a hydrogenation demetallization or hydrogenation protecting agent carrier and a preparation method thereof. Background technique [0002] The deep processing of residual oil is not only conducive to improving the utilization rate of crude oil and alleviating the tense trend of energy supply, but also reducing environmental pollution and achieving clean utilization of energy. Most of the impurities such as sulfur and metals in crude oil are concentrated in the residual oil, and these impurities will pollute the downstream catalysts in the subsequent processing, so these impurities must be removed by hydrotreating first. Compared with distillate oil, residual oil contains a large number of colloids and asphaltenes and other macromolecular compounds, and their diffusion process in the catalyst will directly affect the hydrog...

AI Technical Summary

Problems solved by technology

The main problems in the above-mentioned method for preparing the carrier are: (1) the washing process is relatively complicated, which increases the operating cost of alumina production

(2) Although the pore diameter and pore volume of the alumina modified by this method have increased, there are almost no pores with a pore diameter larger than 100nm

The main problems in the above-mentioned method for preparing the carrier are as follows: (1) the aluminum hydroxide used in the method and water beating is to make the dried aluminum hydroxide finely ground and then beating with water, or the aluminum hydroxide precipitate is washed, The wet filter cake obtained after filtering is beaten with water, and then treated with an aqueous solution containing ammonium ions and selected from carbonate ions and bicarbonate ions. The process is relatively complicated; (2) the patent does not specify the source of the aluminum hydroxide used There are no special restrictions, and it needs to be repulped, and then treated with ammonium carbonate or ammonium bicarbonate aqueous solution, the aluminum carbonate produced is limited to the expansion of alumina