Method for preparing silicon-containing alumina dry gel

Abstract

The invention discloses a method for preparing silicon-containing alumina dry gel. The preparation method comprises the following steps: mixing original clay with a weak acid and a dispersant, then carrying out a hydrothermal treatment, grinding, sieving so as to obtain modified clay with a particle size larger than 160 meshes; then separately adding the modified clay into an aluminum-containing alkaline solution and an aluminum-containing acidic solution, carrying out a parallel-flow gel-forming treatment under a proper condition, filtering, water washing and drying so as to obtain the silicon-containing alumina dry gel. The preparation method can organically combine clay and the generated alumina particles, and adjusts the pore structure and acidity of the silicon-containing alumina so as to further obtain silicon-containing alumina which has the advantages of uniform particle size and concentrated pore distribution. The obtained silicon-containing alumina dry gel is suitable for being used as a carrier component of a catalyst for hydro-demetallization, hydro-desulfurization, or hydro-conversion of heavy oil or residual oil.

Description

technical field

[0001] The invention relates to a preparation method of silicon-containing alumina dry glue, in particular to a preparation method of silicon-containing alumina dry glue suitable for heavy oil or residual oil hydrotreating catalyst carrier materials. Background technique

[0002] In the preparation process of catalysts used in petroleum refining, alumina or silica-containing alumina is usually used as a carrier. SiO alone 2 Only weakly acidic, the acidity of alumina is not strong, and the combination of the two shows a strong acidity. Many studies have shown that adding an appropriate amount of silica to alumina can increase the acidity and specific surface area of ​​alumina, which is beneficial to polymerization and hydrogenation reactions. Silicon-containing alumina has unique advantages and has been successfully applied in the development of various hydrogenation catalysts. The preparation methods of silicon-containing alumina mainly include precipitati...

Examples

Embodiment 1

[0027] Fully mix 100g of kaolin raw soil with 50mL of 2.0mol / L acetic acid and 10g of polyethylene glycol solution dissolved in 50mL of water, and carry out modification treatment on a hydrothermal treatment device. The hydrothermal treatment temperature is 600°C, and the treatment is 4h. . The processed kaolin is cooled and pulverized through a 160-mesh sieve and collected for use.

[0028] The concentration of the sodium metaaluminate solution prepared is 80gAl 2 o 3 / L is 0.7L in total, heated to 80°C for use, the concentration of aluminum sulfate solution is 20gAl 2 o 3 / L, a total of 2L, heated to 80°C for use.

[0029] Add 1.5L of distilled water into the gel tank and heat to 80°C. Respectively take 5g of modified kaolin after sieving and put it into sodium metaaluminate solution and aluminum sulfate solution, and flow into the above two kinds of slurries to keep the pH value at 8.5, and the solid-liquid ratio in the gelling tank is 50g / L remains unchanged, calcul...

Embodiment 2

[0031] Other conditions are the same as in Example 1, except that the amount of modified kaolin is increased to 12g, and silicon-containing alumina B is prepared, wherein SiO 2 The content is 15wt%.

Embodiment 3

[0033] Other conditions are the same as in Example 1, except that kaolin is replaced by montmorillonite, and silicon-containing alumina C is prepared, wherein SiO 2 The content is 5wt%.

technical field

[0001] The invention relates to a preparation method of silicon-containing alumina dry glue, in particular to a preparation method of silicon-containing alumina dry glue suitable for heavy oil or residual oil hydrotreating catalyst carrier materials. Background technique

[0002] In the preparation process of catalysts used in petroleum refining, alumina or silica-containing alumina is usually used as a carrier. SiO alone 2 Only weakly acidic, the acidity of alumina is not strong, and the combination of the two shows a strong acidity. Many studies have shown that adding an appropriate amount of silica to alumina can increase the acidity and specific surface area of ​​alumina, which is beneficial to polymerization and hydrogenation reactions. Silicon-containing alumina has unique advantages and has been successfully applied in the development of various hydrogenation catalysts. The preparation methods of silicon-containing alumina mainly include precipitati...

Examples

Embodiment 1

[0027] Fully mix 100g of kaolin raw soil with 50mL of 2.0mol / L acetic acid and 10g of polyethylene glycol solution dissolved in 50mL of water, and carry out modification treatment on a hydrothermal treatment device. The hydrothermal treatment temperature is 600°C, and the treatment is 4h. . The processed kaolin is cooled and pulverized through a 160-mesh sieve and collected for use.

[0028] The concentration of the sodium metaaluminate solution prepared is 80gAl 2 o 3 / L is 0.7L in total, heated to 80°C for use, the concentration of aluminum sulfate solution is 20gAl 2 o 3 / L, a total of 2L, heated to 80°C for use.

[0029] Add 1.5L of distilled water into the gel tank and heat to 80°C. Respectively take 5g of modified kaolin after sieving and put it into sodium metaaluminate solution and aluminum sulfate solution, and flow into the above two kinds of slurries to keep the pH value at 8.5, and the solid-liquid ratio in the gelling tank is 50g / L remains unchanged, calcul...

Embodiment 2

[0031] Other conditions are the same as in Example 1, except that the amount of modified kaolin is increased to 12g, and silicon-containing alumina B is prepared, wherein SiO 2 The content is 15wt%.

Embodiment 3

[0033] Other conditions are the same as in Example 1, except that kaolin is replaced by montmorillonite, and silicon-containing alumina C is prepared, wherein SiO 2 The content is 5wt%.

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