Integral honeycomb molecular sieve for purifying VOCs in zeolite adsorption runner and preparation

Abstract

The invention relates to an integral honeycomb molecular sieve for purifying VOCs in zeolite adsorption runner and preparation, the preparation method comprises the following steps: 1) powder pre-granulation: mixing a molecular sieve, an inorganic filler, an inorganic binder A and water to prepare slurry, and then carrying out granulation and high-temperature roasting to obtain particle powder; 2)mixing and pugging: uniformly mixing the particle powder, an inorganic reinforcing agent, an organic binder, a pore-forming agent, a plasticizer and a dispersing agent, adding a lubricant, an inorganic binder B and water, and kneading and pugging to obtain pug; and 3) extrusion molding and high-temperature roasting: carrying out vacuum extrusion molding on the pug, and then carrying out drying and high-temperature roasting. Compared with the prior art, the integral honeycomb molecular sieve with the pore density of more than or equal to 300 meshes and the wall thickness of less than or equalto 0.25 mm, which is suitable for purifying VOCs in a zeolite adsorption rotating wheel, is prepared, and when the integral honeycomb molecular sieve is applied to purification of low-concentration VOCs-containing waste gas, the filling volume is small, the adsorption rate and the desorption rate are high, and the thermal regeneration temperature is low.

Description

Technical field[0001]The invention belongs to the technical field of inorganic materials for the purification of VOCs, and relates to an integral honeycomb molecular sieve used for the purification of VOCs by a zeolite adsorption rotor and preparation thereof.Background technique[0002]The development and progress of modern science and technology and the widespread use of chemicals have caused the proliferation of gaseous volatile organic compounds (VOCs), such as non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygen-containing organic compounds (aldehydes, ketones, Alcohol, ether, ester), sulfur-containing organics, chlorine-containing organics, etc. These VOCs have a boiling point of 50-260°C at normal pressure and a saturated vapor pressure of greater than 70 Pa at room temperature. Most of these VOCs are toxic and harmful substances. When the concentration is too high, they can cause poisoning and cause diseases of human organs, and even cause ...

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Problems solved by technology

On the one hand, the honeycomb molecular sieve disclosed in this patent is not suitable for VOCs purification; on the other hand, the honeycomb molecular sieve prepared by it has a lower pore density and a thicker pore wall, resulting in a large mass transfer resistance during application and poor molecular sieve utilization. lower

In addition, secondary drying is required in the preparation process of the honeycomb molecular sieve, and the surface of the honeycomb molecular sieve often has cracks, high wear rate, high energy consumption and low yield cannot meet the needs of industrial production

[0009] Chinese patent CN 107442164 A discloses an extruded molecular sieve honeycomb catalyst and its preparation method. The honeycomb catalyst has a pore density of <150 mesh, cracks on the surface and low molecular sieve content. The honeycomb catalyst reported in this patent is not suitable for For VOCs purification

[0010] Chinese patent CN 105618159 A discloses a method for forming a monolithic honeycomb structure of a molecular sieve catalyst. The pores of the honeycomb molecular sieve catalyst are square holes with a size of 1.4×1.4mm, a wall thickness of 1.0mm, and a mesh number of about 100 mesh. , but the surface is easy to drop powder and the honeycomb surface is prone to cracks during the preparation process

However, the above-mentioned patented technology on the integral extruded honeycomb molecular sieve, whether it is the preparation method or the product specification of the integral extruded honeycomb molecular sieve, does not meet the requirements of the integral honeycomb molecular sieve for the zeolite adsorption runner for VOCs purification.

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