A fluidized bed system and method for efficiently preparing carbon nanomaterials

By setting up a low-temperature impact flow zone and a high-temperature carbon nanomaterial growth zone in the fluidized bed system, and crushing agglomerated particles by using impact flow, the agglomeration problem in the preparation of carbon nanomaterials is solved, and carbon nanomaterials with particle size less than 5μm is efficiently prepared, which improves fluidity and yield and reduces costs.

CN117504744BActive Publication Date: 2025-03-25TSINGHUA UNIVERSITY
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Patent Information

Application Number
CN202311490939.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-09
Publication Date
2025-03-25
Estimated Expiration
2043-11-09

AI Technical Summary

Technical Problem

In the prior art, when preparing carbon nanomaterials, catalysts and template agents are prone to aggregate, resulting in larger particle sizes, higher stacking density, difficult engineering control, poor discharge fluidity, and high post-treatment cost.

Method used

A fluidized bed system is designed, including a low-temperature impact flow zone and a high-temperature carbon nanomaterial growth zone. The impact structure is used to generate an impact flow, crush the aggregated carbon nanomaterials, catalysts and template agents, so that their particle size is less than 5 μm, and it is carried to the high-temperature zone and continues to grow through the fluidized gas.

Benefits of technology

It effectively reduces the bulk density of carbon nanomaterials, improves fluidity, improves the utilization rate of catalysts and template agents, reduces subsequent grinding costs, improves yield and purity, and reduces waste liquid and dosage costs.

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Abstract

The present invention provides a fluidized bed system and method for efficiently preparing carbon nanomaterials, by setting a low-temperature impact flow zone and a high-temperature carbon nanomaterial growth zone in a fluidized bed, and then setting an impact structure in the low-temperature impact flow zone to generate an impact flow, continuously crushing agglomerated carbon nanomaterials, agglomerated catalysts and / or agglomerated templates, and then the crushed small particles continue to grow in the high-temperature carbon nanomaterial growth zone, and obtain a carbon nanomaterial with a particle size of less than 5μm and a bulk density of no more than 0.1g / mL, the fluidity of the material is significantly improved, the utilization rate of the catalyst and / or template is increased, and no grinding is required in the future, and the time cost can be saved by 50%, and the device investment is saved by 10-15%. In addition, the activity of the catalyst and / or template with reduced particle size increases by 5-25%, so that the yield of carbon nanomaterials increases by 30-35%, the processing cost is reduced by 30-50%, and the waste liquid is reduced by 300-500%. Compared with directly placing the impact structure in the high temperature zone, the structure of the present invention is more stable, and the crushing effect of the particles is improved by 50-100%.
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