Residual Protective Life of Carbon Beds.
Quarterly progress rept. no. 4, 1 Dec 76-28 Feb 77,
WORCESTER POLYTECHNIC INST MASS DEPT OF CHEMICAL ENGINEERING
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Weakly sorbed probe gases, ethane and carbon dioxide, were used as a measure of the residual sorption capacity for dimethylmethyl phosphonate DMMP on ASC carbon. The reduced retention time of ethane decreased with increasing loading up to 0.1 gm DMMPgm charcoal above this level it was constant. In a dynamic sorption experiment, in which the bed loading was inhomogeneous lengthwise, ethane retention time decreased as the bed retained increasingly larger amounts of DMMP. To follow the movement of zone of DMMP through BPL charcoal, partially loaded beds were prepared by coupling in series two sections the inlet section presaturated with DMMP and the outlet-free of DMMP. The movement of DMMP was monitored by the change in weight of each section and in retention time of carbon dioxide through each section. The retention time decreased from 4.3 min for completely clean charcoal to 0.3 min for saturated charcoal. Water also affected the retention time of ethane on an ASC carbon bed. Exposure to a feed stream at 18 mm Hg of water pressure resulted in decrease of the reduced retention time from 484 before the exposure to 31 at a loading of 0.24 gm H2Ogm charcoal. Author
- Physical Chemistry