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A kind of aluminum sol balling method

An aluminum sol, oil-ammonia column technology, applied in the direction of aluminum oxide/aluminum hydroxide, liquid droplet granulation, etc., can solve the problems of low surface activity, stick together, reduce the speed of sol particles, etc., to improve the formation of spheres. rate, avoid the effect of consecutive balls

Active Publication Date: 2016-01-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with sulfonate anionic surfactants, fatty alcohol polyoxyethylene ethers and alkylphenol polyoxyethylene ethers have lower surface activity, and are easy to form an emulsified layer at the oil-water interface, reducing the amount of sol The velocity at which particles pass through the interface, which tends to cause several balls to stick together

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take pseudo-boehmite powder with a grain size of 5.0nm (produced by SASOL company, brand name SB) 135g, adding 325g of deionized water to make a slurry, adding 40g of nitric acid with a concentration of 10% by mass, to make an alumina sol with an alumina content of 20% by mass.

[0026] Take trioctylmethyl ammonium chloride (produced by Xiamen Innovit Chemical Co., Ltd., sulfur and sodium elements were not detected) and alkyl glucoside APG0814 (produced by Nanjing Jinling Petrochemical Research Institute Co., Ltd., sulfur content 0.5% by mass, The sodium content is 0.2% by mass, and the number of carbon atoms in the alkyl group is 8-14), and it is prepared into a composite surfactant aqueous solution. The content of trioctylmethylammonium chloride in the aqueous solution was 1.0 mass %, and the content of alkyl glucoside APG0814 was 0.4 mass %.

[0027] In the oil ammonia column with a length of 1.5m and a diameter of 70mm, kerosene is added as an oil phase with a thi...

example 2

[0030] 100g of pseudo-boehmite powder with a grain size of 3.4nm (produced by SASOL company, brand SOLP3) and 35g of pseudo-boehmite powder with a grain size of 4.5nm (produced by the Research Institute of Aluminum Corporation of China Shandong Branch, brand P-DF-LSi) were mixed, and gamma-alumina pellets were prepared according to the method of Example 1. Obtain smooth and round gamma-alumina pellets with a specific surface area of ​​280m 2 / g. No balls are produced.

example 3

[0032] Prepare γ-alumina pellets according to the method of Example 1, except that the calcination temperature of the gel particles is increased to 650°C, and the water vapor content of the air used for calcination is adjusted to 20% by mass, so that γ-alumina pellets with smooth and round appearance are obtained. Alumina pellets with a specific surface area of ​​180m 2 / g. No balls are produced.

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PUM

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Abstract

The invention provides an alumina sol balling method. The method comprises a step of adding a composite surfactant into an oil-ammonia column while adding an oil-ammonia column oil phase into the alumina sol drop by drop, wherein the composite surfactant comprises alkyl glucoside and a quaternary ammonium salt with a general formula of R1R23NX. In the general formula R1R23NX, R1 is a C6-C16 alkyl group, R2 is a C1-C14 alkyl group or C7-C9 aralkyl group, and X is halogen. The method can increase a balling rate and reduce sodium content and sulfur content in an alumina ball.

Description

technical field [0001] The invention relates to a drop ball forming method, specifically, a method for preparing spherical alumina by using aluminum sol as a raw material and adopting an oil ammonia column method. Background technique [0002] The oil ammonia column forming method is a common method for preparing alumina, silicon oxide, silicon aluminum and other pellets. It is to drop the sol into the oil ammonia column, so that the sol particles form balls in the oil phase of the upper layer of the column, and gel in the ammonia water phase of the lower layer. After aging, the gelled particles are dried and calcined to obtain spherical solid particles. The pellets prepared by this method have uniform structure, low wear and high strength, and are widely used as fixed bed and moving bed catalysts, catalyst carriers, and adsorbents. [0003] During the forming process of the oil-ammonia column, in order to overcome the large interfacial tension between the oil phase and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J2/08C01F7/02
Inventor 王国成刘昌呈马爱增潘锦程
Owner CHINA PETROLEUM & CHEM CORP