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Method of preparing active aluminium oxide from aluminium phosphide

A technology of aluminum phosphide and alumina is applied in the field of preparation of activated alumina to achieve the effects of excellent alumina pore texture performance, simple production process and low energy consumption

Inactive Publication Date: 2005-03-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no literature report on the preparation of alumina by the aluminum phosphide hydrolysis process route

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 50L of water to the reaction kettle in advance, heat and keep the water temperature at 40°C; first pass CO into the reaction kettle 2 gas, until the entire reactor and circulation pipes are filled with CO 2 After the gas is released, the aluminum phosphide powder is put in at a constant speed in a quantitative manner, and the CO 2 The gas was continuously stirred; the reaction continued for 2 hours and a total of 6 kg of aluminum phosphide powder was added; the reaction solution was filtered, and the filter cake was dried at 120 ° C for 2 h by ordinary drying methods, and roasted at 500 ° C for 3 h to obtain activated alumina. The sample analyzed by TEM was Needle-like structure with a diameter of 1-2nm and a length of 30-40nm, with a BET specific surface area of ​​280.0m 2 .g -1 , the pore volume is 0.8cm 3 .g -1 .

Embodiment 2

[0013] Add 50L of water to the reaction kettle in advance, heat and keep the water temperature at 30°C; first pass N into the reaction kettle 2 gas, until the entire reactor and circulation pipes are filled with N 2 After degassing, put aluminum phosphide powder in quantitatively and uniformly, and keep N 2 The gas is continuously stirred; the reaction lasts for 2 hours, and a total of 6 kg of aluminum phosphide powder is added; the reaction solution is filtered, and the filter cake is dried by the supercritical drying method of ethanol medium for 2 hours, and roasted at 550 ° C for 1 hour to obtain activated alumina; The performance of alumina is basically the same as that of the sample prepared in Example 1.

Embodiment 3

[0015] Add 50L of water to the reaction kettle in advance, heat and keep the water temperature at 60°C; first pass CO into the reaction kettle 2 gas, until the entire reactor and circulation pipes are filled with CO 2 After the gas is released, the aluminum phosphide powder is put in at a constant speed in a quantitative manner, and the CO 2 The gas is continuously stirred; the reaction lasts for 2 hours and a total of 6kg of aluminum phosphide powder is added; the reaction solution is filtered, the filter cake is vacuum-dried at 60°C for 5h, and roasted at 500°C for 5h to obtain activated alumina; the performance of the alumina prepared by this method is similar to that of The properties of the samples prepared in Example 1 are basically the same.

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Abstract

A process for preparing active aluminium oxide from aluminium phosphide by intermittent hydrolysis method or continuous hydrolysis method is disclosed. Said intermittent hydrolysis method includes such steps as adding excessive water to reactor, adding aluminium phosphide powder, reacting while stirring, collecting hydrogen phosphide gas, filtering solution, drying filtered cake, pulveriznig and calcining.

Description

technical field [0001] The invention relates to a method for preparing activated alumina with aluminum phosphide, which belongs to the preparation technology of activated alumina. Background technique [0002] At present, the annual output of activated alumina in the world is about 100,000 tons, all of which are made of gibbsite or aluminum metal obtained by the Bayer process, and undergo four different processes: quick release method, acid method, alkali method or aluminum alcohol method. These methods generally have disadvantages such as relatively complicated process and high energy consumption. [0003] Aluminum phosphide is usually used to prepare fumigant PH 3 Gas, if it is used as raw material to prepare activated alumina, due to the simple process, the production cost of alumina will be greatly reduced, and then it will occupy a place in the market. At present, there is no literature report on the preparation of alumina by the aluminum phosphide hydrolysis process ...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 沈美庆王军翁端翟燕萍
Owner TIANJIN UNIV
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