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Silicon carbide random filler with porous structure, and preparation method thereof

A technology of porous silicon carbide and random packing, which is applied in the field of chemical packing, can solve the problems of accelerated corrosion of silicon-aluminum ceramics, unknown feasibility and cost performance, and no preparation technology route, so as to achieve good mass transfer efficiency and density The effect of small, well-developed pores

Pending Publication Date: 2021-08-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned patents often only stay at the design level, without giving a specific preparation technology route, and the feasibility and cost performance in actual operation are unknown
[0003] In addition, the main chemical components of the ceramic material described in the current patent are alumina and silicon oxide. In harsh environments, the corrosion rate of silicon-aluminum ceramics is significantly accelerated, which cannot meet the requirements of stable production

Method used

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  • Silicon carbide random filler with porous structure, and preparation method thereof
  • Silicon carbide random filler with porous structure, and preparation method thereof
  • Silicon carbide random filler with porous structure, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this example, silicon carbide powder (average particle size 5 μm), phenolic resin, p-toluenesulfonic acid, and absolute ethanol were mixed in a weight ratio of 60:35:5:30, mechanically stirred, ball milled for 1 hour, and filtered. Obtain slurry raw material. The polyurethane foam with an average pore diameter of 2mm was dipped in the slurry and taken out, the slurry between the pores was blown away by compressed air, and then dried with hot air at 50°C for 20 minutes.

[0039]Cut the pre-dried polyurethane foam into long strips with a width of 10 mm and a thickness of 5 mm, and wind them in a spiral form on a metal rod coated with Teflon coating. When helically wound, the pitch is 10mm, which is consistent with the width of the polyurethane foam strip. The metal rod has a diameter of 15mm and a length of 1000mm. Heat the wrapped metal rod and polyurethane foam at 100°C to 120°C for 5 minutes to cure the resin.

[0040] After solidification, the metal rod was pull...

Embodiment 2

[0044] As described in Example 1, the difference is that the polyurethane foam is impregnated into the slurry and preliminarily dried, and then molded into a saddle-shaped, θ-shaped random packing.

Embodiment 3

[0046] The porous silicon carbide random packing as described in Example 1 was used to study its corrosion resistance in different media environments.

[0047] (1) Using HCl as the medium to study the corrosion resistance of the material. Configure three different concentrations of HCl acid solution (respectively 10wt%, 15wt%, 20wt%), take porous silicon carbide random packing and soak it in three kinds of different concentration solutions for 14 days, measure the mass change rate before and after, porous carbonization Silica random packing weight loss ≤ 0.2%, basically no corrosion;

[0048] (2) Using H 2 SO 4 As a medium, the corrosion resistance of the material was studied, and three different concentrations of H 2 SO 4 Acid solution (respectively 10wt%, 15wt%, 20wt%), take porous silicon carbide random packing and soak in three different concentration solutions for 14 days, measure the mass change rate before and after measurement, the weight loss of porous silicon car...

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Abstract

The invention mainly relates to the field of chemical fillers, and especially to a silicon carbide random filler with a porous structure, and a preparation method thereof. The random filler is made of silicon carbide and is porous in structure. The filler mainly comprises, by mass, 70-100% of silicon carbide, 0-15% of carbon, 0-30% of silicon and 0-10% of silicon dioxide. The filler has the following characteristics: 1, the filler has better corrosion resistance than a common oxide ceramic filler, and can work in corrosive environments of sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid and the like for a long time; 2, the filler can be provided with a three-dimensional communicated pore structure, and pores can be of a regular tetrakaidecahedron-like foamed structure and can also be of a quadrangle or a hexagon or the like; and 3, the random silicon carbide filler has developed pores, large specific surface area and small density, and the rectification efficiency is superior to that of the common ceramic filler.

Description

Technical field: [0001] The invention mainly relates to the field of chemical packing, in particular to a silicon carbide random packing with a porous structure and a preparation method thereof. The new porous silicon carbide filler has the characteristics of corrosion resistance, large specific surface area, high rectification efficiency and low density, and can be widely used in high-efficiency rectification or concentration under various strong corrosive environments. Background technique: [0002] Ceramic packing has good acid and alkali corrosion resistance, high temperature resistance, wear resistance and other properties, so it is widely used in the distillation and purification process in harsh environments such as high temperature and corrosion. Most common ceramic fillers have low strength, unsatisfactory specific surface area and pressure drop, which affect the efficiency of purification and concentration. Most of the ways to enhance the performance of ceramic fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/565C04B35/622
CPCC04B35/565C04B35/622C04B38/0615C04B2235/77C04B2235/96
Inventor 杨振明田冲高勇张劲松
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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