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Preparation method of alumina carrier

A kind of alumina carrier, alumina technology, applied in the direction of alumina/hydroxide preparation, catalyst carrier, chemical instrument and method, etc., can solve the problem that the alumina carrier cannot meet the requirements of residual oil hydrogenation catalyst, and the formed strip is easy to deform Surface, low solid content of wet filter cake, etc., to achieve the effect of good appearance, smooth surface without burrs, and easy dehydration

Active Publication Date: 2015-09-23
BEIJING GAOXIN LIHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can omit the process of drying and pulverizing the pseudo-boehmite gel, the solid content of the controlled wet filter cake is low. When extrusion molding is used, repeated kneading or adding a tackifier is required to form , the shaped strip is easily deformed and the surface is not smooth, and the alumina support prepared by this method cannot meet the requirements of the residue hydrogenation catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step A: weigh 5g of urea solid powder and mix with 20g of Span 80, add to 5kg of aluminum hydroxide filter cake with a dry basis of 10wt%, put into a hydraulic filter press after mixing, at room temperature, under a pressure of 10MPa. Mechanical dehydration is carried out under the conditions to obtain a dehydration filter cake, and the dry basis of the dehydration filter cake is measured to be 37wt%.

[0026] Step B: take 1.0kg of the dewatered filter cake, use a twin-screw extrusion molding machine to shape, and the mold is a cylinder with a diameter of 1.8mm and a length of 4mm; After calcining at 600° C. for 3 hours, the shaped alumina carrier A1 was obtained, and its properties were shown in Table 1.

Embodiment 2

[0028] Step A: weigh 5g of ammonium carbonate solid powder and mix with 27g of Tween 80, add to 5kg of aluminum hydroxide filter cake with a dry basis of 18wt%, mix well and put into a hydraulic filter press, at room temperature, pressure 12MPa Mechanical dehydration was carried out under the conditions of 100 °C to obtain a dehydration filter cake, and the dry basis of the dehydration filter cake was measured to be 36 wt%.

[0029] Step B: take 1.0kg of the dewatered filter cake, use a twin-screw extrusion molding machine to shape, and the mold is a 3.0mm penta-tooth ball; after molding, keep at room temperature for 60min, put it into a 120°C oven for drying, and then bake at 960°C 3h, the formed alumina carrier A2 is obtained, and its properties are shown in Table 1.

Embodiment 3

[0031] Step A: Weigh 5g of ammonium nitrate solid powder and 30g of fatty alcohol polyoxyethylene ether sodium sulfate and mix uniformly, add to 5kg of aluminum hydroxide filter cake with a dry basis of 10wt%, mix well and put into a hydraulic filter press, Mechanical dehydration is carried out under the conditions of temperature and room temperature and pressure of 4MPa to obtain a dehydration filter cake. The dry basis of the dehydration filter cake is measured to be 43wt%.

[0032] Step B: The same as in Example 2, namely, the shaped alumina carrier A3 is obtained, and its properties are shown in Table 1.

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PUM

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Abstract

The invention discloses a preparation method of an alumina carrier. The preparation method comprises the following steps: uniformly mixing an assistant and a surface active agent according to mass ratio, then adding into an aluminium hydroxide filter cake for uniform mixing, then putting into a filter press for mechanical dehydration, and after the formation of the dehydrated filter cake through extrusion, drying and roasting to obtain the alumina carrier. The method provided by the invention has the advantages that the process is simple, energy consumption is low, the mechanical strength of the prepared alumina carrier is high, the pore volume is relatively large, a double-peak-hole structure is provided, and the preparation method provided by the invention is particularly suitable for being used as a residual oil hydrotreating catalyst carrier.

Description

technical field [0001] The invention belongs to the field of inorganic material preparation technology, in particular to a preparation method of an alumina carrier. Background technique [0002] In the field of chemical catalysis, catalyst carriers represented by alumina are widely used in hydrogenation reactions due to their rich pore structure, large specific surface area, controllable surface acidity and alkalinity, and good shape plasticity. Aromatization isomerization reaction and cracking reaction and other catalytic reactions. In production, the most commonly used method for preparing alumina carrier is by first preparing pseudo-boehmite, followed by molding, drying and calcining. Pseudo-boehmite is a boehmite with incomplete crystallization, and its preparation method is mainly based on the hydrolysis method of aluminum alcoholate and the neutralization method (including carbonization method, acid method and alkali method, etc.), among which the neutralization metho...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04C01F7/30
Inventor 杨大奎吴闯孙嬛魏涛刘忠丽张谦温杨霄璞宋兆伟
Owner BEIJING GAOXIN LIHUA TECH CO LTD
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