Product features
Description:
Molecular sieve is an alkali metal aluminosilicate crystal with framework structure and uniform microporous structure. It is an adsorbent with excellent performance, high adsorption capacity and adsorption selectivity.
Firstly, there are many channels with uniform pore size and well arranged pores in the structure of molecular sieves, which not only provide a very large surface area, but also restrict the entry of molecules larger than the pores;
secondly, due to the characteristics of ionic lattice, the surface of molecular sieves has high adsorption capacity for unsaturated molecules, polar molecules and easily polarized molecules Polar molecule, the molecular diameter is smaller than the molecular sieve pore diameter. When the feed gas containing trace water passes through the molecular sieve bed at room temperature, the trace water and mercaptan are absorbed, thus reducing the water and mercaptan content in the feed gas, realizing the purpose of dehydration and desulfurization.
The adsorption process of molecular sieve includes capillary condensation and physical adsorption caused by van der Waals force. From the Kelvin equation, it can be seen that the capillary condensation weakens with the increase of temperature, while the physical adsorption is an exothermic process, and its adsorption weakens with the increase of temperature and increases with the increase of pressure;
therefore, the adsorption process of molecular sieve is usually carried out at low temperature and high pressure, while the desorption regeneration is carried out at high temperature and low pressure. Under the action of high temperature, clean and low pressure regeneration gas, the molecular sieve adsorbent releases the adsorbate in the micropore into the regeneration gas flow until the amount of adsorbate in the adsorbent reaches a very low level, and has the ability to absorb water and mercaptan from the feed gas, realizing the regeneration and recycling process of molecular sieve.
