Hydrogen Production and Cryogenic Air Pre-purification.

Sepcor provides adsorbents for H2, Air pre-purification in systems employing thermal swing or pressure swing regeneration. In cryogenic air pre-purification, water-saturated gas with CO2 is passed through a bed specially promoted or synthesized adsorbent to remove the water and CO2. CO2 is removed to keep the downstream cryogenic units from freezing. Hydrogen is produced via a pressure swing system employing a mixture of adsorbents including molecular sieve, carbon, silica gel, and activated alumina.

O2 and N2 Production

Oxygen and nitrogen are produced either by cryogenic distillation or pressure swing adsorption. In cryogenic distillation to produce oxygen, air is passed through a bed of activated alumina and molecular sieve adsorbents to remove water and CO2. This is necessary to prevent freezing in downstream in the cryogenic distillation system. In these types of systems, it is preferable to use a specially formulated 13X molecular sieve to remove water and CO2. Sometimes compound beds of alumina and molecular sieve are used in these systems. Oxygen can be produced through pressure swing adsorption "PSA" with molecular sieve adsorbents. Air is fed into multi-bed systems in various stages of regeneration and adsorption. Nitrogen, water and CO2 are removed and pure oxygen withdrawn from the system. This type of system requires the use of specially formulated adsorbents to achieve high oxygen purity.

Nitrogen likewise is produced in a PSA system utilizing carbon molecular sieves.  In this system, the uniform pores of the carbon molecular sieve adsorb the oxygen while the purified nitrogen passes through as product gas