A reactor and a method of preparing pseudoboehmite by the reactor

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...

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 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

Images