A reactor and a method of preparing pseudoboehmite by the reactor

A reactor and zone technology, applied in the field of reactors, can solve the problems of dispersion of particle size distribution of aluminum hydroxide, impossible product properties, and uneven distribution of catalyst carrier pores, and achieve uniform particle size, uniform properties, and pore size. The effect of distribution concentration

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. Sim

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] use figure 1 In the shown reactor, the partition plate divides the reactor cavity into two areas evenly. The total volume of the reactor is 800mL, and the volume of each area 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 inlet I5 and feed inlet II6 at the lower part of the reaction cylinder, control the gelling temperature to 70°C, and the motor speed to 0.125 rpm, so that the partition plate 2 in the reactor rotates with the The rotation of the shaft rotates, thereby driving the reaction slurry in the two regions of the reactor to rotate in the reactor, controlling the pH value of the slurry in the acidic region to 4, and the pH value of the slurry in the alkaline region to 9. When the acidic reaction slurry rotates over After the alkaline material inlet II6, control the circulation volume in the circulation line II 7 to 200mL / min...

Embodiment 2

[0041] The preparation process was the same as in Example 1, except that the gelling temperature was controlled at 90° C., and the physical and chemical properties of the prepared pseudo-boehmite are shown in Table 1.

Embodiment 3

[0043] The preparation process is as in Example 1, except that the rotational speed is controlled at 0.25 rpm, the circulation volume in the circulation line II 7 is controlled to be 300mL / min, and the sodium metaaluminate solution is added from II 6 at a speed of 20mL / min. Minutes make the accumulative circulating volume of the acidic slurry in this area reach 1.5 times of the total acidic slurry, the circulating volume in the control circulation line I4 is 300mL / min, and the aluminum sulfate solution is added from I5 at a speed of 35mL / min, ensuring that it is used for 2 The accumulative circulating volume of the alkaline slurry in this area reaches 1.5 times of the total alkaline slurry in minutes. 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, is disposed at a center shaft, and rotates along with rotation of the center shaft. In each of the zones, the corresponding lower part of the reactor cylinder is provided with a material feeding port, at least one material circulating pipeline is disposed outside the corresponding reactor cylinder, a circulated material outlet is at the upper part, a circulated material inlet is at the bottom, 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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IPC IPC(8): B01J19/18C01F7/02
CPCB01J19/18B01J2219/00281B01J2219/00745C01F7/02C01P2004/51C01P2004/61C01P2006/12C01P2006/14C01P2006/16C01P2006/17
Inventor 王永林朱慧红张成关月明
Owner CHINA PETROLEUM & CHEM CORP
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