Method for using molecular sieve assembly in purifying exhaust gas and molecular sieve assembly

Abstract

The invention discloses a method for using a molecular sieve assembly in purifying exhaust gas and the molecular sieve assembly. The molecular sieve assembly includes a porous structure carrier and several layers of molecular sieve material layers. The pore space of the molecular sieve assembly makes it have a first specific surface area , the method of use includes: when several layers of molecular sieve material layers attached to the porous structure carrier reach the adsorption saturation, by coating a new layer of molecular sieve material on the surface of the molecular sieve assembly, it is measured that the molecular sieve assembly has The pore space makes it have the second specific surface area, continue to purify and adsorb the exhaust gas, repeat the adsorption and coating steps, and when the ratio of the second specific surface area to the first specific surface area reaches the preset value, no new coating will be applied. The molecular sieve material layer is used for desorption treatment of the molecular sieve; the molecular sieve assembly used in the above method; the present invention can greatly simplify the operation and save energy without substantially affecting the adsorption capacity.

Description

technical field [0001] The invention belongs to the field of organic waste gas treatment, and in particular relates to a method for using a molecular sieve assembly in purifying waste gas and the molecular sieve assembly. Background technique [0002] The emission of volatile organic compounds (VOCs) from industrial sources involves many industries and has a significant impact on air quality. With the development of my country's economy, VOCs pollution has become an important precursor of air pollution in key urban agglomerations and key areas in my country. One, the currently commonly used adsorbents for VOCs purification mainly include activated carbon, activated carbon fiber, molecular sieve and silica gel. Among them, molecular sieves have been used more and more in the purification of VOCs due to their regular pore structure, large specific surface area, excellent stability, high activity and ion exchange properties. [0003] Molecular sieves are mostly in the form of p...

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Problems solved by technology

[0003] Molecular sieves are mostly in the form of powder or granules, and need to be attached to the carrier through adhesives, etc., so as to form a higher specific surface area, so that the molecular sieve can have a larger contact area with the adsorbed substance. The molecular sieve in the prior art is attached After being on the carrier, it must be reused after desorption only after the adsorption is saturated. The desorption process is more troublesome and the economic benefit is not high. In the existing technology, the carrier mostly uses ceramic honeycomb, which is relatively expensive, and requires a lot of manpower and material resources for handling and handling, and it is also more troublesome to coat molecular sieve materials.