Oxygen Aminata Kamara
About oxygen • Also known as O2 • Colorless, odorless and tasteless • comprises 21 percent of the earth's atmosphere • comprises 85 percent of its oceans • 60 percent of the human body • supports life and makes combustion possible
Production • the second-largest volume industrial gas, is produced commercially as a gas or as a liquid by several methods. • Cryogenic Air separation • a process that compresses and cools atmospheric air, then, - relying on different boiling points - separates the resulting liquid into its components in a distillation column • Vacuum Pressure Swing Adsorption (VPSA), • a non-cryogenic technology that produces oxygen from air by using an adsorbent in a pressure swing process to remove nitrogen
Cryogenic Air Separation Method • Cryogenic technique is a traditional method • Cryogenic gases are liquefied gases at standard temperature and pressure. • requires large sized plants for its processing • Steps to the process • The first step in any cryogenic air separation plantis filtering and compressing air. • The second step is removing the remaining carbon dioxide and water vapor • The third step in the cryogenic air separation is the transfer of additional heat against product and waste gas so as to bring the air feed to cryogenic temperature.
Non-Cryogenic Air Separation Method • non-cryogenic air separation-new technology – developed in 1970 • considered to be a convenient, efficient, and economical method • requires air to force through special materials that selectively pass or retain the oxygen
Universal Industrial Gases, Inc. • Designer, manufacturer, supplier, and installer
VPSA • VPSA system includes a rotary-lobe feed air blower, vacuum blower (two bed systems only), one or two adsorbent vessels, an oxygen surge tank, switching valves and computer controls. • HOW IT WORKS • single-bed system • the blower draws in air, compresses it and sends it to the adsorbent vessel to remove impurities, leaving 90 to 94 percent pure oxygen as the product. • two-bed system • adsorption process cycle that relies on swings in pressure -- from above one atmosphere to below atmospheric pressure (vacuum) -- to cycle each bed sequentially from adsorption to desorption.
Applications • Steel Manufacturing • Chemical Processing • Glass Manufacturing • Health Services • Pulp and Paper • Metal Fabrication