A method for preparing alumina pellets by hot oil column molding
An oil column forming and alumina technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, catalyst carriers, etc., can solve the problems of aging, high content of raw materials impurities, long process time, etc., and achieve easy large-scale industrialization Effects of production, simplified post-processing steps
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example 1
[0027] (1) Preparation of aluminum hydroxide sol
[0028] Get the pseudo-boehmite powder prepared by 65.8g aluminum alkoxide hydrolysis method (Germany, Condea company production, trade mark SB, specific surface area 250m 2 / g, the mass on a dry basis is 50g), 26.0g urea and an appropriate amount of deionized water, stirred to form a suspension with an alumina content of 22% by mass, stirred for 0.5h, and added dropwise 11.7g of a concentration of nitric acid solution of 24% by mass, Stir at 20°C for 2 hours to form an alumina sol slurry with a viscosity of 22s.
[0029] (2) hot oil column forming
[0030] The oil phase of the hot oil column is liquid paraffin (provided by Sinopharm Chemical Reagent Beijing Co., Ltd.), the temperature of the oil bath is 95° C., and the thickness of the oil phase is 180 cm. Mix and stir the alumina sol and 20g of hexamethylenetetramine solution with a concentration of 20% by mass for 0.5h, drop it into a hot oil column to form a ball, take it...
example 2
[0032] Prepare gamma-Al by the method for example 1 2 o 3 The difference is that 10.0 g of hydrochloric acid solution with a concentration of 24% by mass is added to the alumina suspension in step (1) to prepare alumina sol, and the viscosity of the slurry is 22s.
[0033] Alumina sol and 20 g of hexamethylenetetramine solution with a concentration of 20 mass % were mixed and stirred for 0.5 h, and gamma-Al was prepared by hot oil column molding according to the method of Example 1 (2) 2 o 3 Take out the pellets directly from the bottom of the hot oil column, wash with water, dry at 110°C for 2 hours, and roast at 600°C for 4 hours to obtain γ-Al 2 o 3 Table 1 shows the physical parameters, crushing strength and impurity content of pellets.
example 3
[0035] Prepare gamma-Al by the method for example 1 2 o 3 The difference is that the urea added to the pseudoboehmite powder in step (1) is 30.0 g to form a suspension with an alumina content of 21% by mass, stir for 0.5h, and add 11.7g of urea dropwise at a concentration of 24% by mass. % nitric acid solution, stirred at 20°C for 2 hours to form alumina sol, and the viscosity of the slurry was 20s.
[0036] Alumina sol and 12.5 g of hexamethylenetetramine solution with a concentration of 20 mass % were mixed and stirred for 0.5 h, and gamma-Al was prepared by hot oil column molding according to the method of Example 1 2 o 3 Take out the pellets directly from the bottom of the hot oil column, wash with water, dry at 110°C for 2 hours, and roast at 600°C for 4 hours to obtain γ-Al 2 o 3 Table 1 shows the physical parameters, crushing strength and impurity content of pellets.
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