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Preparation tech. for producing pseudoboehmite

A pseudo-boehmite and preparation process technology, applied in the field of large-pore-volume pseudo-boehmite prepared by thermal decomposition two-step method, can solve the problems of limiting hydrogenation and affecting the output of production equipment, etc.

Active Publication Date: 2006-11-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This greatly limits the application of the product in distillate oil hydrogenation, especially in heavy oil and residual oil hydrogenation catalysts
In addition, during the reaction process, the Al in the solution 2 o 3 The content is strictly limited, generally below 8%, which affects the output of the production device to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] NaAlO prepared from bauxite 2 Solution (containing Al 2 O 3 100g / L 1L, add 10g of powdered cyanuric acid (content ≥98.5%), boil and stir well, cool and filter after all is dissolved.

[0023] Take 1.0L of the above solution and put it into a 2L gel tank. The temperature is controlled at 50±2℃, carbon dioxide with a content of 98.5 (volume)% is introduced from the bottom of the gelling tank, the gas flow is 400L / hr, the reaction time is 7 minutes, the pH value drops to 7.0, and it stabilizes for 5 minutes to pH Filter under reduced pressure at 7.0±0.2. The filter cake is washed twice with 6 times 80℃ deionized water. The filter cake is dried at 110℃ with attached water, roasted at 330℃ for 8 hours, and crushed to obtain pseudo-boehmite. Stone powder.

Embodiment 2

[0027] NaAlO prepared from bauxite 2 Solution (containing Al 2 O 3 100g / L 1L, add 10g of powdered cyanuric acid (content ≥98.5%), boil and stir well, cool and filter after all is dissolved.

[0028] Put a small amount of deionized water into a 2 liter gel tank, and under strong stirring, the above solution and Al 2 O 3 40g / L Al 2 (SO 4 ) 3 The solution is reacted in a co-current gel. Gluing temperature is 60±2℃

[0029] The gelling pH value is maintained at 7.0±0.2, and the reaction time is about 40 minutes. After the reaction, keep at 70°C for two hours and filter under reduced pressure. The filter cake is washed twice with 6 times 80°C deionized water, and the filter cake is at 110°C. Dry the attached water, roast at 330°C for 10 hours, and pulverize to obtain the finished product of pseudo-boehmite powder.

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PUM

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Abstract

A process for preparing the alpha-AlO(OH) includes such steps as dissolving tricyanic acid in the sodium aluminate solution containing Al2O3, filtering, forming colloid at 50-90 deg.C, solid-liquid separation, filtering, washing to obtain filtered cake, baking, calcining and pulverizing.

Description

Technical field [0001] The invention belongs to the process method for producing pseudo-boehmite, belongs to the technical field of general chemical or physical methods, and specifically relates to an aluminum salt, such as aluminum chloride, aluminum nitrate, aluminum sulfate, and carbon dioxide as a precipitant and containing three A two-step process for preparing a large pore volume pseudo-boehmite by neutralizing the sodium metaaluminate solution of the polycyanic acid pore expander to form a gel, and thermal decomposition. Background technique [0002] Pseudo-boehmite is also called pseudo-boehmite, its structural formula is [AlOH]·nH 2 O. At present, the method of producing pseudo-boehmite is generally based on the precipitation method, which is divided into two categories: acid method and alkaline method: acid method uses alkali as a precipitant to precipitate hydrated alumina from acidified aluminum salt solution. The activated alumina carrier is formed by the ammonia col...

Claims

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Application Information

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IPC IPC(8): C01F7/14
Inventor 杜建卫刘键孟伟宫晖梁志勇
Owner PETROCHINA CO LTD
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