Accession Number : AD0471790

Title :   AN ENZYMIC CONCEPT FOR CO2 CONTROL IN CLOSED ENVIRONMENTAL CONTROL SYSTEMS.

Descriptive Note : Interim rept. Nov 64-Mar 65,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Allen, John P.

Report Date : AUG 1965

Pagination or Media Count : 41

Abstract : The absorption of CO2 from an air stream was investigated using a closed air loop concept of gas circulation. Graphs of the time versus the CO2 reduction in ppm in the air loop were recorded and the rates of the CO2 removal by various solutions are compared. Distilled water, some buffering compounds, organic and inorganic at 0.2% solutions by weight, ion exchange resins, organic acids and bases, seven amines, and the enzymes carbonic anhydrase and malic dehydrogenase are evaluated. Curves drawn from the CO2 removal monitoring graphs show relative effectiveness for CO2 removal. CO2 absorption by distilled water was considered a relative standard for comparing the solutions. CO2 removal from an air stream using the enzyme carbonic anhydrase in TRIS-maleate buffer is evaluated and shows significant reduction of the carbon dioxide content in the circulating gas mixture. The time periods were comparable to the removal time rate for KOH and LiOH and all the amines tested. TRIS as a 0.2% solution was tested for CO2 absorption and was found to be comparable to sodium borate. Potassium bicarbonate revealed an evolution of CO2 under the conditions of this testing procedure. The air loop concept of testing for CO2 absorption at low concentration of CO2 provided a method of detecting and recording the rapid removal of CO2 from a volume of gases. (Author)

Descriptors :   *CARBON DIOXIDE, *CLOSED ECOLOGICAL SYSTEMS, ABSORPTION, CARBON DIOXIDE, CONTROLLED ATMOSPHERES, WATER, BUFFERS, ION EXCHANGE RESINS, ORGANIC COMPOUNDS, ACIDS, BASES(CHEMISTRY), AMINES, CARBONIC ANHYDRASE, POTASSIUM COMPOUNDS, BICARBONATES, ENZYMES, EXPERIMENTAL DATA.

Subject Categories : Industrial Chemistry and Chemical Processing
      Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE