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Alumina strip form agent and its extrusion molding method and application

A technology for extruding and forming alumina, which is applied in chemical instruments and methods, catalyst carriers, catalysts for physical/chemical processes, etc. Not easy to stick, prolong service life, easy to knead effect

Active Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide aluminum oxide strips and their extruded molding methods and applications in order to overcome the problems of uneven surface, easy bonding, and easy breakage of alumina strips in the prior art. The aluminum oxide strip agent has the advantages of uniform surface, not easy to bond, and high mechanical strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing 30g aluminum oxide solid powder and 3g protein content and be 13% starch (wheat flour of ancient ship, purchased from supermarket) and fully mix, then add the dilute nitric acid of 5% by weight and 1.2g water to continue mixing with the concentration of 8.4g, then put Enter the extrusion machine (manufactured by South China University of Science and Technology Industrial General Factory Manufacturing Company, the model is F-26 twin-screw extruder) and knead for 10 minutes to form a plastic body.

[0033] The plastic body is extruded through a Φ2 mm orifice to obtain a strip-shaped wet alumina molding.

[0034] Dry the wet alumina molded body at room temperature for 12 hours, then dry at 120°C for 12 hours, and finally raise the temperature from room temperature to 850°C at a heating rate of 4°C / min, and bake at 850°C for 6 hours to obtain cylindrical bars Shaped aluminum oxide strips with a diameter of 2mm, smooth surface, uniform thickness and regular ...

Embodiment 2

[0037] Take by weighing 27g aluminum oxide solid powder and 2.4g protein content and be 9% starch (cornstarch, purchased from supermarket) fully mix, then add the dilute nitric acid and 1.5g water that the concentration of 6g is 3% by weight and continue to mix, then put into The extruder kneaded for 10 minutes to form a plastic body.

[0038] The plastic body is extruded through a Φ2 mm orifice to obtain a strip-shaped wet alumina molding.

[0039] Dry the wet alumina molded body at 40°C for 6 hours, then dry at 150°C for 1 hour, and finally raise the temperature from room temperature to 700°C at a heating rate of 5°C / min, and bake at 700°C for 15 hours to obtain a cylinder The strip-shaped aluminum oxide strip has a diameter of 2mm, smooth surface, uniform thickness and regular shape.

[0040] Tested according to the method of Example 1, the average mechanical strength in the radial direction is 75N / piece.

Embodiment 3

[0042] Take by weighing 33g of aluminum oxide solid powder and 3.6g of protein content and be 10% starch (sweet potato powder, purchased from supermarket) and fully mix, then add 9g of dilute nitric acid with a concentration of 8% by weight to continue mixing, then put into extruder and knead 10min, molding to obtain a plastic body.

[0043] The plastic body is extruded through a Φ2 mm orifice to obtain a strip-shaped wet alumina molding.

[0044] Dry the wet alumina molded body at 20°C for 12 hours, then at 100°C for 12 hours, and finally raise the temperature from room temperature to 800°C at a heating rate of 6°C / min, and bake at 800°C for 10 hours to obtain a cylinder The strip-shaped aluminum oxide strip has a diameter of 2mm, smooth surface, uniform thickness and regular shape.

[0045] Tested according to the method of Example 1, the average mechanical strength in the radial direction is 72N / piece.

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Abstract

The invention relates to the field of petrochemical catalysts, and discloses a method for extrusion molding of alumina, an alumina strip prepared by the method, and an application of the alumina strip in catalysts. A method for extrusion molding of alumina, comprising the following steps: (1) kneading alumina powder, protein-containing starch, dilute nitric acid and optional water to obtain a plastomer; (2) subjecting the plastomer to Extruding to obtain a wet molding; (3) drying and roasting the wet molding to obtain an alumina strip. The aluminum oxide strip prepared by the method has the advantages of uniform surface, low adhesion and high mechanical strength.

Description

technical field [0001] The invention relates to the field of petrochemical catalysts, in particular to a method for extrusion molding of alumina, an alumina strip prepared by the method, and an application of the alumina strip in catalysts. Background technique [0002] In recent years, porous alumina is often used as an adsorbent and catalyst carrier because of its high specific surface area and pore volume. For example, in the field of petroleum processing, alumina moldings are often used as supports for hydrogenation catalysts. However, alumina powder is easy to agglomerate and difficult to shape and process. Therefore, in the traditional extrusion molding method of alumina, it is necessary to add a large amount of organic binders, such as soluble starch binders, to bind the alumina together. However, when this type of adhesive is used, it is difficult to release the mold during the extrusion process, and the surface of the formed alumina strip is uneven and easy to bon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00C04B35/10C04B35/636
Inventor 张明森赵清锐柯丽武洁花邵芸
Owner CHINA PETROLEUM & CHEM CORP
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