A reactor and a method of preparing pseudoboehmite by the reactor

A technology for reactors and cylinders, applied in the field of preparing pseudo-boehmite and reactors for preparing pseudo-boehmite, which can solve the problem of dispersed aluminum hydroxide particle size distribution, non-concentrated distribution of catalyst carrier pores, and inconsistent product properties. It is possible to achieve consistency and other problems, and achieve the effect of uniform particle size, uniform properties, and large pore size

Active Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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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 the inconcentration of catalyst support pore distribution. At the same time, due to intermittent operation, the properties of multiple batches of products cannot be consistent, thus affecting the performance of the final alumina

Method used

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  • A reactor and a method of preparing pseudoboehmite by the reactor

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Embodiment 1

[0042] use figure 1 In the shown reactor, the partition 1 divides the reactor cavity evenly into two regions. The total volume of the reactor is 800mL, and the volume of each region is about 400mL. The process is as follows: Aluminum sulfate solution (80g Al 2 o 3 / L) and sodium metaaluminate solution (200gAl 2 o 3 / L) respectively enter the reactor from the feed port I4 and feed port II5 at the lower part of the reaction cylinder, control the gelling temperature to 70°C, control the pH value of the slurry in the acidic zone B to 3, and the pH of the slurry in the alkaline zone A The pH value is 8.5, start the circulation system in A and B areas, the circulation line I 3 circulates the acidic slurry to the bottom of the alkaline area A at a circulation rate of 36mL / min, and flows into the A area in parallel with the sodium metaaluminate solution II5 , control the feed flow rate of sodium metaaluminate solution to 27mL / min; similarly, the circulation line II 6 circulates the...

Embodiment 2

[0044] 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

[0046] The preparation process is as in Example 1, except that the control is as follows: the circulation volume in the circulation line II 6 is 40mL / min, the sodium metaaluminate solution is added from II 5 at a speed of 30mL / min, and at the same time, the slurry circulation in the circulation line I 3 is controlled The volume is 50mL / min, and the aluminum sulfate solution is added from I4 at a rate of 50mL / min. The physical and chemical properties of the prepared pseudo-boehmite are shown in Table 1.

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Abstract

A reactor and a method of preparing pseudoboehmite by the reactor are disclosed. The reactor comprises a reactor cylinder. A separating plate is disposed in the reactor cylinder to divide the inner cavity of the reactor into two zones along the axial direction. At least two material circulating pipelines are disposed outside the reactor cylinder. A circulated material outlet and a circulated material inlet in each material circulating pipeline are disposed in different zones. The circulated material outlets are at the upper part of the reactor cylinder and the circulated material inlets are at the bottom of the reactor cylinder. In each of the zones, the corresponding lower part of the reactor cylinder is provided with a material feeding port, and the corresponding upper part of the reactor cylinder is provided with an overflow port higher than the corresponding circulated material outlet. Continuous gel forming can be achieved by the reactor. Pseudoboehmite particles prepared by adopting the reactor 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, and is not influenced by batch production scales.

Description

technical field [0001] The invention provides a reactor, especially a reactor for preparing pseudo-boehmite, and a method for preparing pseudo-boehmite by using the reactor. 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 alkali, such as alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J14/00C01F7/02
Inventor 王永林朱慧红张成关月明
Owner CHINA PETROLEUM & CHEM CORP
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