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Water-resistant silica-alumina gel particle product and production method thereof

A silica-alumina gel and gel technology, which is applied in the direction of silica, ceramic products, silica, etc., can solve the problems of poor water resistance and bursting when exposed to water, and achieve high compressive strength, low regenerative breakage rate, and long life. Effect

Active Publication Date: 2018-10-23
青岛海湾集团有限公司
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Problems solved by technology

[0003] Aiming at the technical problems of poor water resistance of the existing silica gel and cracking when encountering water, the present invention proposes a silica-alumina gel particle with high water resistance, low regeneration breakage rate and long service life and a production method thereof

Method used

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  • Water-resistant silica-alumina gel particle product and production method thereof

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Embodiment

[0015] Formulated with SiO 2 10%~14%, Al(OH) 3 2.0% to 3.0% alkali solution, 8% to 12% sulfuric acid solution and 2.5% to 4.5% aluminum sulfate solution for use; nitric acid or hydrochloric acid solution can also be used instead of sulfuric acid solution, and sulfuric acid solution is safer.

[0016] Under the pressure of 0.1-1.0 MPa, the above solution undergoes a step-by-step reaction through a suspension granulation device, is sprayed into the air through a nozzle, and then polycondenses into granular gel particles. Then the gel particles are sequentially processed through the following treatment processes:

[0017] Aging process: put the gel particles into an aging tank filled with hot water at 20-80°C, and soak for 0.5-2.0 hours.

[0018] Acid soaking process: Soak the aged gel particles in a solution containing 1-5% of inorganic acid aluminum for 2-10 hours; the inorganic acid aluminum solution is one of sulfuric acid solution, nitric acid solution and hydrochloric aci...

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Abstract

The invention provides a waterproof alumina-silica gel particle product. The SiO2 content of the product is 80-88.5wt%, the Al2O3content of the product is 10-17wt%, the average specific surface area of the product is 400-700m<2> / g, the average aperture of the product is 2.0-5.0nm, the average granularity of gel granules is 0.5-8mm, and the average pore volume is 0.3-0.6ml / g. The invention also provides a production method of the waterproof alumina-silica gel particle product. The waterproof alumina-silica gel particle product with the advantages of good granule integrality, high compressive strength, small regeneration breaking rate, long service life and multi-time repeated regeneration can be prepared through the method, and a detection result shows that the pressure resistance of the finished product is not smaller than 70N / granule; and the waterproof rate can reach 95% or above, and the product difficulty cracks under a very high content of free water. The product can be used as a liquid adsorbent and a catalyst carrier, and also can be used as a protection layer of common silica gel and alumina-silica gel.

Description

technical field [0001] The invention belongs to the field of silica gel production, and in particular relates to a water-resistant silica-alumina gel particle product and a production method thereof. Background technique [0002] Industrial silica gel is an important inorganic chemical product. The chemical composition and physical structure of silica gel determine that it has many characteristics that other materials do not have: high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength. Strength, etc., so it is widely used in desiccant desiccant, water absorbent, moisture-proof agent, catalyst carrier, filler, etc. It is also gradually moving towards refinement and specialization, and its applications are becoming more and more extensive, and its applications in analysis, separation, catalyst carriers, coatings, etc. are constantly expanding. Silica gel is classified according to shape, size, pore size, use, adsorption c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J2/06
CPCC01B33/16C01P2006/12C01P2006/16C04B30/00C04B38/0045
Inventor 赵玉奇
Owner 青岛海湾集团有限公司
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