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 affecting the output of production equipment and limiting hydrogenation, etc.

Active Publication Date: 2007-11-14
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 powdered cyanuric acid (content ≥ 98.5%), boil and fully stir, cool and filter for later use after all dissolve.

[0023] Take 1.0L of the above solution and put it into a 2L gel-forming tank. The temperature is controlled at 50±2°C, carbon dioxide with a content of 98.5 (volume)% is introduced from the bottom of the gelling tank, the gas flow rate is 400L / hr, the reaction time is 7 minutes, the pH value drops to 7.0, and the pH value is stabilized for 5 minutes. 7.0±0.2, filter under reduced pressure, wash the filter cake with 6 times 80°C deionized water twice, dry the filter cake with attached water at 110°C, roast at 330°C for 8 hours, and pulverize to obtain pseudoboehmite stone powder.

Embodiment 2

[0027] NaAlO prepared from bauxite 2 solution (containing Al 2 o 3 100g / L 1L, add 10g powdered cyanuric acid (content ≥ 98.5%), boil and fully stir, cool and filter for later use after all dissolve.

[0028] A small amount of deionized water was put into a 2-liter gel-forming tank, and under vigorous stirring, the above solution was mixed with Al-containing 2 o 3 40g / L Al 2 (SO 4 ) 3 The solution adopts co-current gelation mode to react. The gelling temperature is 60±2°C, the gelling pH value is kept at 7.0±0.2, and the reaction time is about 40 minutes. After the reaction, keep at 70°C for two hours, filter under reduced pressure, and wash the filter cake with 6 times 80°C deionized water Twice, the filter cake was dried at 110°C with attached water, roasted at 330°C for 10 hours, and crushed to obtain the finished 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 a process 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 precipitating agent and containing three A polycyanic acid pore-expanding agent sodium metaaluminate solution is neutralized to form a gel, and a process method of preparing pseudo-boehmite with a large pore volume in two steps of thermal decomposition. Background technique [0002] Pseudo-boehmite is also known as pseudo-boehmite, and 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 alkali method: the acid method uses alkali as a precipitant to precipitate hydrated alumina from the acidified aluminum salt solution, and commonly used oil The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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