Control of Volatile Organic Compounds Emissions from Manufacturing

Table E-12. PROCEDURE TO CALCULATE HEAT LOAD
OF A CONDENSATION SYSTEM FOR STYRENE IN AIR (Concludedl
Item Value
Average (bul k) gas temperature (Tb) ,OF (80 + Tout) + 2
3i
Density of air (pair), 1 b/ft ,j
1 i C(0.002517 x Tb) + 1.1571
Specific heat of air((cp)air),
Btu/l b-OF From API Report 44k
Sensible heat change of air (Qa V x pair x (cp) x (80-Tout)
Btu/hr
air
60 min/hr
Specific heat of styrene ((cp) 1,
Btu/l b-OF StY From API Report 441
Sensible heat change of styrene (Q'sty),
Btu/hr WS x ( c ~ X )(80-Tout) ~ ~ ~
Total design heat load (Qtot), ~tu/hr~ 1-2 (Qsty + Qair + Qtsty)
aCal culated from Clausius Clapeyron curve fit
(In p = m 1+ b) of styrene vapor pressure versus
T, OK
temperature data given on p. 3-59 of the Chemical Engineers' Handbook
(Reference 26) for 80°F (see temperature required for reduction).
b~olume fraction of styrene = 7.952 mm Hg = 0.01046 ft3 styrene/ft3 gas.
760 mm Hg
CAssumi ng ideal gas:
styrene content (lb/ft3 gas) =
0.01046-ft3 styrene 1b-mole 104.14 1 b styrene
ft3 gas 394.13 ft4 1 b-mol e
x