Alumina molded body, preparation method and application thereof, catalyst, preparation method, hydrotreating method and production molding system
A technology of molded body and alumina, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems of secondary dust pollution, difficult transfer, high water content, etc. Achieve the effects of reducing operating energy consumption, avoiding dust pollution, and simplifying the process flow
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[0049] According to the first aspect of the present invention, the present invention provides a method for preparing an alumina molded body, the method comprising the following steps: (1) molding a hydrated alumina composition to obtain a molded body;
[0050] Optionally, (2) drying the molded product obtained in step (1) to obtain a dried molded product;
[0051] (3) In the presence of water vapor, calcining the molded product obtained in step (1) or the dried molded product obtained in step (2) in an oxygen-containing atmosphere.
[0052] In step (1), the hydrated alumina composition contains hydrated alumina and a compound having at least two proton acceptor sites.
[0053] The alumina hydrate may be one or more selected from alumina trihydrate and alumina monohydrate. The hydrated alumina preferably contains alumina monohydrate, more preferably alumina monohydrate. Specific examples of the hydrated alumina may include, but are not limited to, boehmite, alumina trihydrate...
Embodiment 1
[0175] The alumina hydrate wet gel used in this example is a quasi-alumina hydrogel solution prepared by the acid method (sodium metaaluminate-aluminum sulfate method, obtained from Sinopec Changling Branch) after washing and filtering. The wet filter cake of boehmite (the wet filter cake is coded as SLB-1), after measurement, the i value of the wet filter cake is 78.2%.
[0176] (1) Put 200g of wet filter cake numbered SLB-1 in a beaker, then add 5g of methylcellulose (purchased from Zhejiang Haishen Chemical Co., Ltd., the same below) and 3g of scallop powder (galactomannan The content is 80% by weight, purchased from Beijing Chemical Reagent Company, the same below), and after stirring for 10 minutes with a mechanical stirrer, the obtained mixture is the hydrated alumina composition of the present invention (such as image 3 shown), and its properties are listed in Table 1.
[0177] (2) Extrude the hydrated alumina composition prepared in step (1) on a F-26 twin-screw extr...
Embodiment 2
[0182] (1) Mix 5 kg of wet filter cake numbered SLB-1 with 500 g of deionized water for beating for 1 minute, then send the obtained slurry into a plate and frame filter press, adjust the pressure of the plate and frame to 0.7 MPa and maintain After 15 minutes, a wet filter cake (coded as LB-1) was obtained. It has been determined that the i value of the wet filter cake numbered LB-1 is 62%.
[0183] (2) 300g of wet filter cake numbered LB-1 was placed in a beaker, and 4.5g of hydroxyethyl methylcellulose (purchased from Shanghai Huiguang Fine Chemical Co., Ltd., the same below) and 1.5g of scallop powder ( The content of galactomannan is 85% by weight (purchased from Beijing Chemical Reagent Company). After stirring for 10 minutes with a mechanical stirrer, the hydrated alumina composition of the present invention is obtained, and its properties are listed in Table 1.
[0184] (3) Extrude the hydrated alumina composition prepared in step (2) on an F-26 twin-screw extruder wi...
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