Introduction to the Basic Principles of Alcoholic Salt Solution, Yangzhou Zhongtianli

Today, the editor of Zhongtianli will talk to you about the basic principle of preparing ultrafine aluminum hydroxide by hydrolysis of alcohol and salt water. Metal alkoxide ROMs (alkoxy compounds) are generally soluble in ethyl alcohol and easily decompose in water. The products are hydrated oxides or hydroxides, and most elements can generate alkoxy compounds. Depending on the hydrolysis conditions, nanoparticles or ultrafine particles can be obtained, and the products can be single or composite oxides. Based on this principle and the special advantages of alcohol brine hydrolysis, it is widely used in the preparation of ultrafine powders. We choose to produce ultra-fine and high-purity aluminum hydroxide by hydrolyzing aluminum salt and alcohol salt solution according to our own conditions. By reacting metal halides with alcohols, metal organic compounds with M-O-C bonds are generated.

Metal alkoxides are prone to hydrolysis to form oxides or hydrate precipitates of oxides.

The particle size and distribution of the produced precipitate depend on the growth rate v1 of the precipitate crystal nucleus and the growth rate v2 of the crystal. Obviously, the larger the growth rate v1 of the crystal nucleus, the more metal oxide or hydrate particles formed by hydrolysis per unit time, and the finer the particle size. However, the larger the v, the more likely the generated particles are to collide and agglomerate into large grains. According to Wennarn Tarnman's theory:

Where k is a constant;

Q is saturation;

L is the solubility of the substance;

D is the diffusion coefficient of the crystal nucleus;

S is its surface area;

We can control a suitable v1/v2 ratio by adjusting relevant parameters to produce ultrafine oxides or oxide hydrates with a certain particle size distribution. For example, by selecting calcined alcohol, the hydrophobicity of alkoxide salts can be increased, thereby adjusting the D and L values; Select a suitable alcohol salt solution to adjust the D, image.png values; Change the hydrolysis temperature conditions of alkoxides to adjust k values, etc.

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