Preparation method of kaolin nanotubes

Abstract

The invention discloses a preparation method of kaolin nanotubes. The preparation method comprises the following steps: flaky kaolin and an intercalating agent (such as N-methylformamide) are mixed, then are ball-milled in a high-energy ball mill for 1 min to 24 h, and are dried; the obtained mixture and a solvent (such as methanol) are mixed, and then are ball-milled in the high-energy ball millfor 1 min to 24 h to carry out a surface grafting reaction; the obtained reaction product and a structure inducing agent (such as a quaternary ammonium salt surfactant) are mixed, and are ball-milledin the high-energy ball mill for 1 min to 24 h; and finally the obtained mixture is dried and calcined to obtain the kaolin nanotubes. The preparation method converts kaolin with a flaky crystal structure into kaolin with a tubular crystal structure in a short time and a high efficiency, breaks the bottleneck restricting a processing and preparation technology of a kaolin-based catalyst carrier material, and achieves the purposes of high efficiency and low energy consumption.

Description

technical field [0001] The invention relates to a preparation method of kaolin nanotubes. Background technique [0002] Kaolin is a general term for clay or rock mainly composed of kaolinite minerals. It is widely distributed in my country and has large reserves. It is currently widely used in ceramic industry, refractory material industry, chemical industry, light industry, and in aerospace industry. It also shows its unique effect. An important application of kaolin in the chemical industry is as a catalyst support material. Domestic refineries generally use fluid catalytic cracking (FCC) process to process heavy oil to produce gasoline, diesel and low-carbon olefins. The key technology is the catalyst, and the kaolin-based carrier is crucial to the performance of the catalytic cracking catalyst. The microstructure (pores, micromorphology, etc.), particle size distribution, and surface acidity of kaolin all have important effects on the performance of catalytic materials....

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation technology of kaolin nanotubes mostly adopts the process of intercalation-exfoliation for multi-step operation. For example, Chinese patent CN102602951A reports a preparation method of kaolin nanotubes. After mixing, heating and mechanical stirring for 20-30 hours, mix with methanol and react with mechanical stirring at room temperature for 48-72 hours, then mix with methanol solution of quaternary ammonium salt surfactant, and react with mechanical stirring for 10-30 hours at room temperature , and finally calcined at high temperature for 4-6 hours, plus the washing and drying of each step, it took nearly a week

This method is not only relatively cumbersome, but also takes a long time, consumes a lot of energy, and has low economic benefits.

Another example is the preparation method of kaolin nanotubes reported by Chinese patent CN104386702A. In the preparation process, the method needs to repeatedly heat up, keep warm, and cool down. The reagents used include urea, triethanolamine, methyl iodide ethanol solution, sodium cetylsulfonate aqueous solution, etc. , where multiple high-temperature treatment parts need to be heated to 90-170°C, the process is also cumbersome and complicated, and the energy consumption is large

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