be more clearly understood from the description provided below sorption vessel 10 further includes a screening system 24 that is disposed within tank 12 referring now to fig2 screening system 24 is illustrated in greater detail and as shown is at least partially submerged beneath the predetermined pulp level 16 the extent to which screening device 24 becomes submerged in the pulp is determined by the liquid level of the pulp and the amount of pulp introduced into screening device 24 screening system 24 isolates pulp disposed therein from the pulp contained within tank 12 by way of a housing 26 which provides a hydraulic differential betwen the predetermined pulp level 16 and screening system 24 as pulp is continuously introduced into screening system 24 sorbent is selectively and continuously separated from the slurry by way of screen members 28 screen member 28 can include one or more individual screen panels or alternatively screen member 28 can include a continuous linear screen such as for example the one illustrated in u s pat no 4 692 240 the entire content of which is incorporated herein by reference in a most preferred embodiment screen member 28 is angularly disposed with respect to pulp level 16 preferably screen 28 is vibrated by vibration means such as the dual motor arrangement 30 however a single motor arrangement is also within the scope of this invention motors 30 can also be used to impart motion to a continuous linear screen in the event that such an embodiment is opted for screen member.