Accession Number : ADD014107

Title :   Secondary Oxygen Purifier for Molecular Sieve Oxygen Concentrator.

Descriptive Note : Patent, Filed 2 Feb 88, patented 21 Mar 89,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Miller, George W ; Theis, Clarence F

Report Date : 21 Mar 1989

Pagination or Media Count : 8

Abstract : The secondary purifier, composed of two cylindrical adsorbent beds and valving, is used to increase the oxygen concentration of the product gas comprising oxygen and argon from a zeolite molecular sieve concentrator. The oxygen purity of the gas is increased by selectively absorbing and exhausting the argon component by the use of beds of small particle size (16 X 40 mesh) carbon molecular sieve. In a two step cycle, during step 1 of the cycle one bed receives high pressure 30 PSIA feed gas which pressurizes the bed and establishes a product oxygen flow, and the argon component of the air is removed by preferential adsorption in the carbon molecular sieve. Simultaneously, the high pressure gas in the other bed is vented to a lower pressure usually the ambient surroundings, and this depressurization serves to desorb the argon previously adsorbed during the high pressure phase of the cycle. In step 2 of the cycle the adsorbent beds exchange roles. This constant cycling results in a continuous product stream of very high purity oxygen (up to 99.6%). The separation is conducted at a temperature of 297 K. The secondary purifier does not require a regenerative purge flow for efficient operation, which minimizes the feed gas consumption. This invention will improve the present molecular sieve oxygen concentrators for field hospitals and portable oxygen therapy. The two adsorbent beds are operatively connected to six solenoid actuated valves, one manual valve and a programmable solenoid actuator. The system according to the invention does not require a regenerative purge flow for efficient operation. This feature minimizes the feed gas consumption. Keywords: Patents. (aw)

Descriptors :   *MOLECULAR SIEVES, *PATENTS, *PURIFICATION, *OXYGEN EQUIPMENT, ACTUATORS, ADSORPTION, ARGON, CARBON, COMPUTER PROGRAMMING, CONCENTRATION(CHEMISTRY), CONCENTRATION(COMPOSITION), CONSUMPTION, CYCLES, EFFICIENCY, FIELD EQUIPMENT, FLOW, GASES, HIGH PRESSURE, HIGH RATE, HOSPITALS, LOW PRESSURE, MANUAL OPERATION, MOLECULAR PROPERTIES, OPERATION, OXYGEN, PARTICLE SIZE, PORTABLE EQUIPMENT, PURITY, SECONDARY, SOLENOID VALVES, SOLENOIDS, STREAMS, THERAPY, VALVES, OXYGEN GENERATORS, PURGING

Subject Categories : Life Support Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE