Zur Kinetik der Adsorption von Dämpfen im Luftstrom

Sorption of Chloropicrin and Phosgene on Charcoal from a Flowing Gas Stream

“…All the charcoal used in this research was a zinc chlorideactivated, extruded wood charcoal, approximately [12][13][14][15][16] mesh, produced by the National Carbon Company. It was dried in an oven for 3 hours at 150°C.…”

“…Starting with clean charcoal, then, there are two mechanisms W'hich can cause the critical length to be different from zero (as it would be if equilibrium wrere established instantly), the finite time required for mass transfer from the flowing gas stream to the charcoal surface, and the time required to combine with the charcoal. Hurt (9) showed in principle that the contributions to the critical bed depth for these two factors are additive; hence x, centimeters Phosgene Break Times as a Function of Charcoal Bed -%0,d + X'j.r (14) where x<>,i is given by Equation 12or 13 and x0,r by Equation 5.…”

“…The extent of removal by adsorption on charcoal of various gases from a flowing, stream of air was measured by other workers by (a) determining the increase in weight of the charcoal at different time intervals (8,14,20), (b) by allowing the transmitted gas to accumulate over known time intervals in chemical absorbing solutions which can be titrated (2), (c) by measuring the intensity of radioactivity of radium and thorium emanations not adsorbed by the charcoal (3), and (d) by measuring the thermal conductance of the effluent air stream ( , 17). In this paper the authors describe a method of studying adsorption rates involving the use of an ultraviolet photometer which makes possible a rapid, quantitative, and continuous analysis of the effluent air stream for either chloropicrin or phosgene, with a hitherto unequaled sensitivity (10).…”