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A kind of preparation method of strip grain boehmite
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A technology of boehmite and crystal grains, which is applied in the field of preparation of hydrated alumina, can solve the problems of high cost, tediousness, difficulty in large-scale production, etc., and achieve the effect of simple method and uniform crystal grain dispersion
Active Publication Date: 2017-01-25
CHINA PETROLEUM & CHEM CORP +1
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This process is relatively cumbersome, and the added toluene needs to be separated, and the product needs to be washed with ethanol, which is costly and difficult to achieve large-scale production
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example 1
[0033] (1) Preparation of aluminum n-hexoxide
[0034] In the 3-liter reactor with stirring and condenser, add 162.8 grams (100ml) of n-hexanol with a purity of 99.5%, 54 grams of aluminum powder with a purity of 99.9%, adjust the stirring speed to 300rpm, and heat up to 120°C. Afterwards, keep the temperature at 150° C., continue to add 637 grams (783 ml) of n-hexanol dropwise, continue the reaction for 1 hour after the dropwise addition, and then lower the temperature to 60° C. to obtain a solution of aluminum n-hexoxide.
[0035] (2) Preparation of boehmite
[0036] The aluminum n-hexoxide solution prepared in step (1) was hydrolyzed at 85°C, the water / aluminum alcohol molar ratio was 4, and the stirring speed was 150rpm. The hydrolyzed product was placed in a closed container and filled with nitrogen to a pressure of 0.62MPa , aging for 6 hours at 100° C. and a stirring speed of 150 rpm. After aging, n-hexanol is not separated, but the resulting slurry is directly spray-dr...
example 2
[0038] Prepare boehmite according to the method of example 1, the difference is (2) the aging temperature of the aluminum n-hexyl alcohol hydrolyzate is 120 ℃, n-hexanol is not separated after aging, and the obtained slurry is spray-dried to obtain boehmite B, The grains are strip-shaped, and the length and width of the grains are shown in Table 1.
example 3
[0040] Prepare boehmite according to the method of example 1, the difference is (2) the aging temperature of the aluminum n-hexyl alcohol hydrolyzate is 160 ℃, does not separate n-hexanol after aging, obtains boehmite C after the gained slurry is spray-dried, Its TEM image is shown in figure 2 , the grains are strip-shaped, and the length and width of the grains are shown in Table 1.
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Abstract
A strip-shaped crystal grain boehmite preparation method is as follows: C3-C7 aluminium alkoxide is hydrolyzed at 80-100 DEG C under the condition of water / aluminium alkoxide molar ratio of 3-6, the hydrolyzed slurry is placed in a sealed vessel, and aged for 2 to 72 hours at 60-250 DEG C under the pressure of 0.2-1.0MPa, and the aged slurry is dried. The method can reduce strip-shaped boehmite crystal grain aggregate, and is simple in process, low in cost and suitable for mass production.
Description
technical field [0001] The invention is a preparation method of hydrated alumina, in particular, a preparation method of strip crystal boehmite. Background technique [0002] Alumina is widely used in electronics, chemical industry, medicine, machinery, aerospace, metallurgy and other fields due to its various crystal forms and different physical properties. Common alumina crystal forms include γ-, θ-, η-, κ-, δ-, α-, etc., among which α-alumina has a high melting point (up to 2050°C), strong heat resistance and corrosion resistance And excellent wear resistance, widely used in engineering and functional ceramics, substrates of integrated circuits, high-strength materials, wear-resistant materials, refractory materials and other fields; and γ-alumina has porous high dispersion, high specific surface, good adsorption It is often used as a catalyst carrier in petrochemical industries such as hydrogenation, dehydrogenation, desulfurization and cracking, and is one of the most ...
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