Among impurities that can be found in the air and gas, water is the most common undesirable impurity, which is associated with natural gases in the vapor form. The presence of water may cause corrosion, hydrate formation, and freezing in the pipeline, so the dehydration of natural gas is more crucial.
Water is adsorbed by solid desiccants, most often with molecular sieve, silica gel, or alumina. Due to a high polar surface within zeolite pores, water vapor and other components are easily adsorbed on zeolites, activated alumina or silica gel even at very low concentrations. This exclusive feature distinguishes zeolite, activated alumina and silica gel good commercially available adsorbents.
Molecular Sieve 3A
Molecular sieve 3A is widely used in gas dehydration to remove water becasue it can only adsorb water other than left components.
Molecular Sieve 4A
Molecular sieve 4A is used to remove water as well as other small molecules such as CO2, etc because of low price than 3A.
Activated alumina is good desiccant, adsorbent and catalyst that can be used for moisture removal, water purification,and clause reaction catalyst.
Silica Gel Adsorbents
Silica gel is good adsorbent and desiccant used in wide area such as pharmaceutical, PSA hydrogen purification, electronic protection.