How to prepare aluminum hydroxide using alkoxide hydrolysis method, Zhongtianli

Today, the editor of Zhongtianli will talk to you about how to prepare ultrafine aluminum hydroxide using alkoxide hydrolysis method. Based on our own experimental conditions, we choose to hydrolyze aluminum salt and alcohol salt water to obtain ultra-fine and high-purity aluminum hydroxide. The experiment selected anhydrous AIC1 as the raw material, reacted with an alcoholizer, and simultaneously introduced NH and dechlorinated to prepare aluminum alkoxide. After a series of treatments such as hydrolysis, the product was obtained as ultrafine micro aluminum hydroxide powder. Reagents used in the experiment: anhydrous methanol (cp grade), anhydrous ethanol (cp grade), anhydrous isopropanol (cp grade), benzene, anhydrous AICl, (second or third grade), NH; Gas, deionized water, etc.

The alcoholization reaction is carried out in a reflux reactor (alcoholizer), with constant temperature operation. A certain amount of ammonia gas is stirred and introduced to promote the reaction. As the ammonia gas is introduced, the white solid in the reflux reactor gradually increases. When the pH value reaches around 8, it is regarded as the reaction endpoint. Vacuum filtration is used to remove NH and CI that are insoluble in organic reagents, and the filtrate is colorless and transparent aluminum ethanol salt (trihydrate ethoxy aluminum).

Then, the generated aluminum alcohol salt solution is subjected to water bath distillation in a distillation flask to recover benzene and alcohol, which are used to treat the next batch of anhydrous AlCl. Alcoholization is reversed and the distilled aluminum alcohol salt solution is hydrolyzed by adding deionized water containing organic surfactants at different temperature conditions to obtain highly dispersed aluminum hydroxide.

AI (OH) was prepared by reacting different types of alcohols with anhydrous A1-Ch; The granularity is different. The reason may be due to varying degrees of alcoholization reactions. Due to the easy exchange of - OR 'in organic solvents containing - OR groups in alkoxides, the hydrolysis activity of alkoxides changes; Due to the different polarity, polar distance, and ability to obtain active protons of organic surfactants when adding deionized water containing surface active agents to the alkoxide solution for hydrolysis at different temperatures, different effects occur during the hydrolysis of alkoxide solution. At the same time, it should also be noted that the addition of alcohol must be excessive, otherwise it will affect AICl; The dissolution is unfavorable and cannot fully react with it, directly affecting Al (OH); Recovery rate. The experimental results show that the particle size of aluminum hydroxide prepared from isopropanol as an alcoholizing agent is smaller than that of methyl alcohol and ethanol as alcoholizing agents, meeting the ultra-fine requirements. However, when isopropanol is used as an alcoholizing agent, the operation process of the alcoholization reaction is more complex and difficult to control. Therefore, it is recommended to use ethanol as an alcoholizing agent.

Yangzhou Zhongtianli is a professional manufacturer of high-purity aluminum hydroxide. If you need, please follow us. http://www.yzcrown.com