Preparation method of alumina pellets through hot oil column moulding

A technology of oil column forming and alumina, which is applied in the direction of chemical instruments and methods, alumina/aluminum hydroxide, catalyst carrier, etc., can solve the problems of aging, high impurity content of raw materials, and long process time, and achieve easy large-scale industrialization Production, the effect of simplified post-processing steps

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

The leaching of metal aluminum or gibbsite with hydrochloric acid needs to be carried out under high temperature and high pressure, which will seriousl

Method used

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  • Preparation method of alumina pellets through hot oil column moulding
  • Preparation method of alumina pellets through hot oil column moulding

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides a preparation method of alumina pellets through hot oil column moulding. The preparation method comprises the following steps: preparing an alumina suspension liquid from pseudo-boehmite powder, which is produced by an alkoxyl aluminium hydrolysis method, a first gelatinizing agent, and water, then adding an acid solution into the alumina suspension liquid to obtain alumina slurry, adding a second gelatinizing agent into the alumina slurry, evenly mixing, then dropwise adding alumina slurry into a hot oil column so as to form alumina pellets, directly collecting alumina pellets from the bottom end of the hot oil column, washing the collecting aluminum pellets by water, drying, and burning. The provided method has the advantages that the post treatment technology is simplified and the method can be applied to large scale industrial production.

Description

technical field [0001] The invention is a method for preparing alumina pellets, in particular, a method for preparing high-purity alumina pellets from high-purity aluminum hydroxide sol. Background technique [0002] Due to its high specific surface area, narrow particle size distribution, good adsorption, thermal stability and surface acidity, alumina is widely used as a carrier of petrochemical catalysts, adsorbents and hydrogenation catalysts. For different industrial production devices, catalysts need to be made into different shapes and sizes to meet the needs of continuous production. For the continuous reforming moving bed catalytic process for the production of high-octane gasoline blending components, rich hydrogen and aromatics, in order to realize the continuous delivery of the catalyst and meet other industrial design requirements, reduce the mechanical wear of the catalyst, the carrier must be oxidized Aluminum is made into round balls with a diameter of 1.4-2....

Claims

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Application Information

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IPC IPC(8): C01F7/02B01J21/04B01J32/00
Inventor 刘建良马爱增潘锦程杨彦鹏蔡迎春
Owner CHINA PETROLEUM & CHEM CORP
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