[mclean] 



ADSORPTION OF GASES 



189 



lowed to be in contact with the lignite which was kept at a constant 

 temperature (20°C.)- 



The pressure readings given by the manometer, L, were taken at 

 intervals for the three succeeding days. The amount adsorbed was 

 calculated, the results being given in Table I. 



Table I 



Amount 

 admitted 



Time 



(t) 



Pressure 



Amount 

 adsorbed (x) 



t/x 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



161 -4 00. 



•0 hrs. 



•05 



•25 



•5 



•0 



•0 



•0 



•0 



•0 



■0 



•0 



■0 



•0 



•0 



■0 



•0 



•0 



•0 



344 

 312 

 294 



288 

 284 

 280 

 275 

 273 

 269 

 268 

 265 

 262 

 258 

 255 

 254 

 253 

 252 

 251 



•0 mm.. 



•5 



■0 



•2 



•0 



•0 



•5 



•0 



■5 



•0 



■5 



•2 



•0 



•0 



•5 



■5 



•0 



•5 



24 

 37 

 44 

 47 

 48 

 50 

 52 

 52 

 54 

 55 

 56 

 57 

 59 

 60 

 60 

 60 

 61 

 61 



8cc. 



4 



8 







7 



3 



1 



9 



5 







3 



3 



1 



2 



5 



8 



5 



6 







•0014 

 •0056 

 •Oil 

 •021 

 •039 

 •096 

 •132 

 •183 

 •218 

 •266 

 •349 

 •423 

 •498 

 •578 

 •658 

 •813 

 •974 



The curves for the relation between the amount adsorbed (x) 

 and the time (t) are shown in Fig. 2. The part of the curve between 

 A and B shows that at first the adsorption takes place very quickly 

 and represents the condensation of the gas upon the surface of the 

 lignite. The other part, between B and C represents the slower 

 diffusion into the interior of the lignite. Thus the process is much the 

 same as for coconut charcoal. 



The curve plotted between t and t/x approximates a straight line 

 showing that the equation for the curve for x and t is of the form: 



t/x = a+bt 



where a and b are constants. 



