Accession Number : AD0780819

Title :   Optimization of Charcoal Drying Time.

Descriptive Note : Technical rept. Nov 73-Jan 74,

Corporate Author : EDGEWOOD ARSENAL ABERDEEN PROVING GROUND MD

Personal Author(s) : Meseke,Edward L.

Report Date : JAN 1974

Pagination or Media Count : 21

Abstract : Respirator and collective protection filters are required to meet a moisture specification before packaging because of the moisture-sensitive ASC Whetlerite on the charcoal. Although the specification must be met, there is no standard method for determining the drying time required for new filters. This study was designed to obtain a method for optimizing drying time based on the temperature, the filter bed depth, and the moisture on the filter. Desorption isotherms were found for four temperatures, two bed depths, and two flow conditions. By use of these and other available data, a method was devised for determinaton of an optimum drying time. In addition to the method for determination of optimum drying time, several other items of interest were learned. One, drying time can be reduced drastically by drying with an internal flow of hot air. This dynamic drying does not need as high a temperature as the static drying. Another was that the dryness of charcoal depends not only upon the bed depth but also the method and temperature of drying. (Author)

Descriptors :   *CHARCOAL, *GAS FILTERS, *DRYING, DESORPTION, MOISTURE

Subject Categories : Physical Chemistry
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Chemical, Biological and Radiological Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE