Filtering material for purifying volatile organic compounds and preparation method thereof

Abstract

The invention belongs to the field of environmental protection, and particularly relates to a filtering material for purifying volatile organic compounds and a preparation method thereof. The filtering material comprises a filling layer and high-temperature-resistant fabric layers arranged on the two sides of the filling layer, wherein the filling layer comprises a three-dimensional porous fiber net and micron particles distributed in pores of the fiber net; the fiber net is made of glass fibers and / or ceramic fibers; the materials of the micron particles comprise a hydrophobic molecular sieve, an inorganic binder and silicon carbide in a weight ratio of (5-7): (1.5-2): (1-2); the weight ratio of the fiber net to the micron particles is (5-10): (70-80). The filtering material disclosed bythe invention has the characteristics of high temperature resistance, high molecular sieve content, light weight and the like, is similar to paper in shape, belongs to a flexible material and is convenient to process into various shapes. And meanwhile, the structure is stable, the service life is long, and application in actual production is facilitated.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a filter material for purifying volatile organic compounds and a preparation method thereof. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refers to the general term for volatile organic compounds whose melting point is lower than room temperature and whose boiling point ranges from 50 to 260 °C. VOCs are an important class of gaseous pollutants in the atmosphere. VOCs not only have a direct impact on human health and the ecological environment, but also can generate secondary pollutants by participating in atmospheric photochemical reactions. Therefore, controlling the emission of VOCs and effective governance are of great significance to human health and environmental protection. [0003] Although the activated carbon in the current adsorption filter material has a large adsorption capacity, it is not resistant t...

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Problems solved by technology

However, it has the following problems: 1. It uses chemical fiber, which is not resistant to high temperature and will decompose at 250-300°C; 2. After the activated carbon itself absorbs organic matter, it has the possibility of burning because of impurities in the preparation process; 3. Contains Thermoplastic resin adhesive has poor high temperature resistance; 4. Two layers of fabric cover, simply connected up and down by thermoplastic resin adhesive, the air volume and wind speed when passing through are not involved, and there may be problems of weak bonding when large air volume is applied

However, it has the following problems: 1. Zeolite molecular sieves are NaY molecular sieves, 4A molecular sieves, 13X molecular sieves, zsm-5 molecular sieves or hydrophobic molecular sieves. Under high humidity conditions, the first few molecular sieves mentioned are preferentially adsorbed Water, while exhaust gas generally has a certain humidity, molecular sieves are transformed into polar molecular sieves after absorbing water molecules, and its adsorption effect cannot be guaranteed; while the limitation of hydrophobic molecular sieves is more vague

2. The use of powder-type molecular sieves is easy to drop powder; at the same time, the use of inorganic binders makes it easy for the molecular sieve powder to be wrapped by the binder to form a binder film that hinders gas adsorption; 3. The properties of silica sol and aluminum sol are different. Aluminum sol has high water absorption, and the performance of natural kaolin and attapulgite is unstable; 4. It adopts copying method, the particle size of molecular sieve is small, and the retention rate is low

However, it has the following problems: 1. The molecular sieve content cannot be guaranteed, and the molecular sieve may fall off, whether it is SiCl 4 Gas or water vapor treatment, when it reacts to the molecular sieve itself and affects the structure of the honeycomb body, it cannot guarantee the molecular sieve content and maintain the stable structure of the honeycomb body; 2. It uses pickling, although the solid product is removed , but the acid will damage the crystallinity of the molecular sieve itself, resulting in a decrease in the specific surface area, thereby affecting the adsorption performance; 3. When the honeycomb body is repeatedly exposed to high-temperature water vapor and acidic liquid, the appearance and support strength of the honeycomb corrugation will be different. damage to a certain extent

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