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A method of preparing pseudoboehmite

A pseudo-boehmite and aluminum hydroxide technology, which is applied in the field of preparing pseudo-boehmite, can solve the problems of dispersed aluminum hydroxide particle size distribution, non-concentrated catalyst carrier pore distribution, and unstable product properties. The effect of uniform diameter, uniform properties and stable product properties

Active Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a gelling kettle to gel intermittently, and its disadvantages are: due to the addition of bottom water in the gelling kettle, the solid content of the slurry increases continuously during the gelling process, and the grain formation and growth environment of aluminum hydroxide are not stable. Similarly, the particle size distribution of aluminum hydroxide is dispersed, resulting in a non-concentrated pore distribution of the catalyst support, and because the acidic solution and the alkaline solution are added alternately, the operation difficulty is also increased. At the same time, due to intermittent operation, the product properties are unstable.

Method used

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  • A method of preparing pseudoboehmite

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Effect test

Embodiment 1

[0036] Adopt the pseudoboehmite prepared by the present invention, the reactor volume is 500mL, and the control material residence time is 15 minutes, and the process is as follows: aluminum sulfate solution (50g Al 2 o 3 / L) and sodium metaaluminate solution (200gAl 2 o 3 / L) At the same time, it enters the reactor from the feed port I 5 and the feed port II 6 at the lower part of the reaction cylinder, and the circulating material passes through the slurry circulation system I 4 and the slurry circulation system II 7 respectively, and the circulation line I 4 is controlled at 10mL / min The circulation volume of the slurry is injected into the acid pipeline, and in the pipeline, it is mixed with the aluminum sulfate solution with a flow rate of 25mL / min and enters the reactor together; similarly, the slurry is injected into the alkali with a circulation volume of 25mL / min by controlling the circulation line II 7 and then mixed with sodium metaaluminate solution with a flow r...

Embodiment 2

[0038] The preparation process is as in Example 1, except that the gelling temperature is controlled at 90°C, the pH value of the mixed slurry is adjusted to 9 with potassium carbonate solution, the aging temperature is 90°C, and the aging time is 30 minutes, then washed and dried at 150°C for 4 hours , the physical and chemical properties of the prepared pseudo-boehmite are shown in Table 1.

Embodiment 3

[0040] The preparation process is as in Example 1, except that the residence time of the material is controlled to be 9 minutes, and the circulation line I is controlled to inject the slurry into the acid pipeline with a circulation rate of 35mL / min, and in the pipeline, the aluminum sulfate solution with a flow rate of 35mL / min After mixing, enter the reactor together; similarly, control the circulation line II 7 to inject the slurry into the alkaline line at a circulation rate of 20mL / min, and enter the reaction together after mixing with the sodium metaaluminate solution with a flow rate of 20mL / min in the line The physical and chemical properties of the prepared pseudo-boehmite are shown in Table 1.

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Abstract

A method of preparing pseudoboehmite is disclosed. The method includes preparing aluminium hydroxide precipitate, ageing, washing and drying. The preparation of the aluminium hydroxide precipitate adopts a reactor, wherein the reactor comprises a reactor cylinder and is provided with a stirrer inside, the bottom of the reactor cylinder is provided with two feeding ports, two material circulating pipelines are disposed outside the reactor cylinder, each of the material circulating pipelines is provided with at least one outlet, circulating material outlets are in the upper part of the reactor cylinder, inlets of the two material circulating pipelines are respectively connected to the two feeding ports through pipelines, and the upper part of the reactor cylinder is provided with an overflow port that is higher than the circulating material outlets. Pseudoboehmite particles prepared by the method are uniform in particle size, so that prepared aluminum oxide is large in pore volume, large in pore diameter and centralized in pore distribution, and the prepared aluminum oxide is uniform and constant in properties.

Description

technical field [0001] The invention provides a method for preparing pseudo-boehmite, in particular to a method for preparing pseudo-boehmite with large pore volume and large pore diameter. Background technique [0002] γ-Al 2 o 3 As a catalytic material, alumina is widely used in the field of catalysis, especially in the field of catalytic hydrogenation. Preparation of γ-Al 2 o 3 The usual method is to prepare pseudo-boehmite first, and then roast it at a certain temperature to convert it into γ-Al 2 o 3 . Pseudo-boehmite does not have a complete crystal shape, and its chemical composition is not very certain. It is difficult to express it with an accurate molecular formula. It can be considered as boehmite with incomplete crystallization. The chemical composition can be approximately written as [AlOOH ]·nH 2 O(n=0.080~0.602). [0003] Pseudo-boehmite generally has three preparation methods in industry: [0004] (1) Neutralization reaction of aluminum salt and alk...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 刘杰王永林朱慧红张成关月明
Owner CHINA PETROLEUM & CHEM CORP
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