mass transfer in multiphase systems - Greenleaf University

MASS TRANSFER
R IN MULTIPHASE SYSTEMS: VOLATILE
ORGANIC
COMPOUND
REMOVAL IN THREE-PHASE SYSTEMS
Figure 6. Simplified VOC mass flow instrument.
A RAEGuard PID was used to
analyze and
indicate total VOCs. The scale for
the PID needed
to match the expectation value for meeting the 2 lb/hr criterion. Assuming 400 standard cubic
feet per minute (scfm) to determine the scale
for the PID, the total VOC assuming a conservative
molecular weight of 166 g/mol for PCE, the concentration in parts per million (ppm v ) is:
3
2lb/hr
359ft /lbmol
VOC= 4
3
00ft /min 166lb/lbmol 60min/hr 6
10 =180 ppm v
(1)
Therefore, the scale was set at 0-1000 ppm v .
The rate in lb/hr is found by a multiplying operator function, i.e.:
14