Method for preparing unformed aluminium hydroxide

An aluminum hydroxide and amorphous technology, applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, reagents, educts, etc., can solve the contradiction between the mechanical strength of the carrier and the large pore size, pore volume, acid Poor solubility and other problems, to achieve the effect of shortening the gelation time, shortening the gelation time, and reducing the cost

Inactive Publication Date: 2006-10-11
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by this method has poor acid solubility and cannot solve the contra...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take industrial grade gibbsite [containing Al 2 o 3 63% (w)] 152.4g and NaOH aqueous solution 273g (w), add 150g of deionized water, heat to 100°C under stirring, keep the temperature for 120min, until the aluminum hydroxide is completely dissolved to obtain a concentration of about 400g Al 2 o 3 · L -1 Sodium metaaluminate solution [NaOH / Al(OH) 3 The mol ratio is 1.4], and then diluted with deionized water to a concentration of 15g Al 2 o 3 · L -1 Add 8% ammonium bicarbonate solution to the sodium metaaluminate solution; then add deionized water accounting for 1 / 2 of the volume of the reactor to the reactor, open the valve, and the raw material solution (the mixed solution of dilute sodium metaaluminate above) with CO 2 [98% (V)] The gas flows into the reactor at the same time, and the two are mixed at the bottom of the reactor. A strong stirrer is installed in the reactor. Outflow at the outlet; control the gelling temperature at 25°C, CO 2 The flow rate ...

Embodiment 2、3

[0017] The preparation method is the same as in Example 1, and the concentrated sodium metaaluminate solution is diluted to 5gAl 2 o 3 · L -1 and 30gAl 2 o 3 · L -1 , the main properties of the resulting product are listed in Table 1.

[0018] Reference example 1

[0019] In Example 1, the concentrated sodium metaaluminate solution was diluted to 40 g Al 2 o 3 · L -1 , the main properties of the resulting product are listed in Table 1.

[0020]

Embodiment 4、5

[0022] Change NaOH / Al(OH) 3 The mol ratio is 1.6,1.8, and all the other are the same as in Example 1, and the main properties of the product obtained are as shown in Table 2.

[0023] sample

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PUM

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Abstract

The invention discloses a method for preparing non-shaped aluminum hydroxide, relating to an aluminum hydroxide, especially relating to a method for preparing aluminum hydroxide with high acid dissolubility and low density. The method comprises following steps: preparing strong sodium metaaluminate with gibbsite and sodium-hydroxide to control solution caustic ratio; diluting with deioned water and adding hole enlarging agent; adding deioned water into autoclave firstly, got solution of raw material and carbon dioxide flows into autoclave to control glue forming temperature; regulating feeding flow rate and filtering, washing and drying slurry and getting said product. The invention employs continous feeding and carbon dioxide of high concentration for glue forming to fasten neutralizing reaction and shorten glue forming time, and thus prevents diaspore generation, saves cooling device, increases device usage or reduces autoclave volumn. The product can dissolve into hydrogene nitrate of 20% completely and the bulk density is less than or equal to 0.4 g/ml.

Description

technical field [0001] The invention relates to aluminum hydroxide, in particular to a preparation method of high acid-soluble low-density aluminum hydroxide. Background technique [0002] Activated alumina is the longest and most widely used synthetic carrier. It is not only rich in resources, but also has the characteristics of high crushing strength, good thermal stability, high absorption rate, moderate specific surface area, and adjustable pore volume and pore size distribution. It is an excellent adsorption and supported catalyst for petrochemical and fertilizer industries. carrier. Because the alumina support used in macromolecular reaction catalysts such as residual oil hydrogenation must have a sufficiently large pore size and pore volume, but the existing support is difficult to meet this requirement. In the prior art, the pseudo-boehmite is generally prepared first, and then the alumina carrier is prepared. For example: Chinese patent CN 03101176.4 describes th...

Claims

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Application Information

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IPC IPC(8): C01F7/14
CPCY02P20/141
Inventor 方维平谭亚南李枫王跃敏
Owner XIAMEN UNIV
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