Selection of Nabok molecular sieve rotors in VOCs treatment
A typical molecular sieve is a silicate crystal with a rich microporous structure, featuring uniform pore distribution, stable structure, and non-combustibility. It is widely used in adsorption concentration equipment, especially for the adsorption of high-boiling-point organic compounds such as DMAc, NMP, and MEK. However, desorption and regeneration must be carried out at high temperatures. Molecular sieves have a stable structure and, unless the pores are completely blocked, their service life can generally last for several years. On the other hand, activated carbon cannot be used at high temperatures and its regeneration is relatively difficult.
The commonly used molecular sieves in current adsorption concentration equipment are generally hydrophobic molecular sieves with a high silica-alumina ratio. This is because the exhaust gas usually contains a certain amount of moisture, and water molecules will compete with organic compounds, hindering their adsorption. The performance of activated carbon is more easily affected by moisture, while hydrophobic molecular sieves can preferentially adsorb organic compounds under higher humidity conditions, demonstrating significant superiority.
Due to the uniform pore distribution and certain selectivity of molecular sieves, only organic compounds of the appropriate size can be easily adsorbed. Therefore, molecular sieve adsorption concentration rotors are generally only applicable to situations where the composition of the exhaust gas is relatively clear and relatively simple. That is to say, a single molecular sieve is only suitable for the adsorption of some gases, and there is no molecular sieve that can adsorb all organic gases well. However, by combining and matching different molecular sieves, taking advantages of each other's strengths, their functions can be enhanced, and even some better performance can be achieved. In general, this method is relatively complex and cumbersome, requiring a lot of data accumulation and experimental support. If there are indeed two components with completely different adsorption properties in the exhaust gas that need to be treated, different molecular sieve rotors can be combined and used in series. This solution is relatively simple and feasible.
In summary, molecular sieve adsorption rotors are an advanced waste gas treatment technology that is developing. However, during application, detailed examination is necessary. One cannot expect a single device to cure all diseases. Utilizing the strengths of the device can fully demonstrate its value.
