Knowledge of the structure and characteristics of molecular sieve

Molecular sieve is a silicate or a crystalline aluminosilicate, and formed of silicon oxide or aluminum oxide tetrahedra linked by oxygen bridges tetrahedron. Molecular size (typically 0.3 ~ 2.0 nm) of the pore and cavity system, so as to have characteristics of solid molecules. However, with the synthesis and application of molecular sieve-depth study, researchers found that the aluminophosphate molecular sieves and sieve skeleton elements (silicon or aluminum or phosphorus) may be composed of B, Ga, Fe, Cr, Ge, Ti, V , Mn, Co, Zn, Be and Cu, substituted, its pore size and the cavity may reach 2 nm or more, the zeolite framework elements can be divided according to type aluminosilicate zeolite, Activated alumina adsorbent molecular sieves and molecular sieve framework heteroatoms ; divided by pore size, pore size of less than 2 nm, 2 ~ 50 nm and the molecular sieve is larger than 50 nm are referred to as micropores, mesopores and large pore molecular sieves. Because of the larger aperture size becomes larger carrier molecules react well, but the pore walls of mesoporous materials are amorphous, resulting in the hydrothermal stability and thermal stability still can not meet the required conditions for petrochemical applications demanding .

Molecular sieve and activated alumina What is the difference

activating molecular sieves and activated alumina belong to the same industrial sorbent adsorption mechanism are the same, in general do-liquid adsorption, molecular sieve and activated alumina in general with the use of activated alumina general points in the lower part of the purification do pretreatment, molecular sieves Late relatively fine purification for adsorption.Molecular sieve absorption ability, for the purification of gas, should be saved to avoid direct exposure to the air. Should be reproduced before the molecular sieve and has longer storage time of use of the absorbent. Zeolite avoid oil and liquid water. Should be used to avoid contact with the oil and liquid water. Activated alumina ball is mainly used in chemical, metallurgy, electronics, oil and other industrial gases such as dried air, oxygen, nitrogen and other permanent gases smelt gas and oil cracking gas. I produced the activated alumina is a multi-pore, high-intensity x-ρ-alumina product  have a strong affinity for water is a water depth of desiccant drying trace. Use medium has soaked in water the same soft, not inflated, not powder dry phase characteristics, textile industry, oxygen and industrial automation instrument air dry. 13X molecular sieve adsorption equilibrium static water can reach about 23%. Activated alumina 17% of the way.

Molecular sieve type oxygen machine works:

Process for the two towers. After feed air pressurized by the compressor, through the air pretreatment means to remove oil, dust and other solid impurities and water, and cooled to room temperature, treated by the compressed air through the intake valve into the Activated alumina adsorbent containing a molecular sieve, the air nitrogen, carbon dioxide is adsorbed effluent gas is the high purity oxygen, Tada when adsorbed to a certain saturation, the intake valve closed, the flush valve opens, the adsorption tower into the rinse stage, after the flush valve is closed, the valve opens desorption into the desorption regeneration phase, so that a complete cycle.