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Preparation method of aluminium oxide dry glue

A technology of alumina dry glue and alkali metal aluminate, which is applied in the field of preparing alumina dry glue by using an impinging flow reactor, can solve the problems of low alumina crystallinity, incomplete crystal grains, dispersion of particle size distribution, etc. The effect of full gas-liquid reaction, complete grain and uniform distribution

Inactive Publication Date: 2015-05-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous decrease of the pH value of the solution during the gelation process, the prepared alumina also has low crystallinity, dispersed particle size distribution, and incomplete crystal grains.

Method used

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  • Preparation method of aluminium oxide dry glue
  • Preparation method of aluminium oxide dry glue
  • Preparation method of aluminium oxide dry glue

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Add bottom water to the bottom of the gas-liquid impingement flow reactor and heat it to 90°C; start the impingement flow reactor and adjust the propeller speed to 1000 r / min. Adjust the impact direction of the two acceleration tubes to be horizontal, start the accelerator, inject the alkali metal aluminate aqueous solution with a concentration of 30g / 100mL at a flow rate of 15L / h from the feed port I, and atomize the liquid through the pressure atomization nozzle The CO injected by the accelerator tube at the air inlet level with it at a flow rate of 10L / h 2 Collide with each other, react for 1.0h, stop injecting gas and liquid and the bottom agitator; at the same time, add sodium metaaluminate solution and aluminum sulfate solution continuously at 0.6L / min at the feed port II and III at both ends of the impact flow reactor, Adjust the pH value to 7.5, and after 15 minutes of neutralization reaction, stop feeding at the feed port; raise the temperature at the bottom to...

Embodiment 2

[0046] Add bottom water to the bottom of the gas-liquid impinging flow reactor and heat it to 80°C; start the impinging flow reactor and adjust the propeller speed to 1500 r / min. Adjust the impact direction of the two acceleration tubes to be horizontal, start the accelerator, inject the alkali metal aluminate aqueous solution with a concentration of 25g / 100mL at a flow rate of 10L / h from the feed port I, and atomize the liquid through the pressure atomization nozzle The CO injected by the accelerator tube at the air inlet level with it at a flow rate of 10L / h 2 Collide with each other, react for 1.0h, stop injecting gas and liquid and the bottom stirrer; at the same time, add sodium metaaluminate solution and aluminum sulfate solution continuously at 0.8L / min at the feed port II and III at both ends of the impact flow reactor, Adjust the pH value to 7.0, and after 10 minutes of neutralization reaction, stop feeding at the feed inlet; raise the temperature at the bottom to 120...

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Abstract

The invention discloses a preparation method of aluminium oxide dry glue. The preparation method comprises the following contents: (1) adding bottom water into the bottom of an impinging stream reactor and heating to a certain temperature, starting stirring blades at the bottom; (2) starting an accelerator and respectively injecting an alkali metal aluminate aqueous solution and CO2 airflow by accelerating tubes at the upper part of the impinging stream reactor, atomizing the alkali metal aluminate aqueous solution by a pressure atomizing nozzle, carrying out a gas-liquid impinging stream reaction between the atomized alkali metal aluminate aqueous solution and the CO2 airflow in a gas-liquid impinging area so as to generate aluminium oxide crystal nucleus, and letting the aluminium oxide crystal nucleus enter a settling zone after settlement; (3) simultaneously and continuously adding an acidic aluminium saline solution and the alkali metal aluminate aqueous solution or an alkali precipitant into feed inlets II and III at two ends of the bottom of the impinging stream reactor after the end of the gas-liquid impinging stream reaction, adjusting pH value, carrying out a neutralization reaction and stabilizing for a period of time; and (4) shutting down the impinging stream reactor after the end of the stabilization, aging, filtering, washing and drying to obtain the aluminium oxide dry glue. The aluminium oxide dry glue can be used for preparation of a hydrogenation catalyst carrier.

Description

technical field [0001] The invention relates to a method for preparing alumina dry glue, in particular to a method for preparing alumina dry glue by utilizing an impingement flow reactor. Background technique [0002] At present, industrial aluminum hydroxide is mainly prepared by industrial routes such as acid dissolution and reprecipitation with ammonia water or other alkalis. This method has complex production process, requires anti-corrosion equipment and consumes expensive chemical raw materials. In China, the cost of hydrolysis of organoaluminum compounds produced by other industrial by-products is much lower. In view of the fact that domestically produced pseudo-boehmite cannot compete with foreign countries in price, it is very valuable to research and develop cheap preparation routes and methods. [0003] CN85100161A discloses a kind of " carbonic acid process (CO 2 method) to produce pseudo-boehmite, which uses the intermediate product-industrial sodium aluminat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 吕振辉薛冬彭绍忠张学辉高玉兰徐黎明
Owner CHINA PETROLEUM & CHEM CORP
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