MDI Emissions Reporting Guidelines for the ... - Polyurethanes

Therefore:
MDI Emissions Reporting Guidelines for the Polyurethanes Industry
L fll = V air * (1 / 359) * (273.15 / T fill ) * (VP MDI / 760) * M w * K MDI * C blnd
L fll = (83556 ft3) (1/359) (273.15/294.2) (6.09 x 10 -6 mm Hg/760) (250.26) (0.54) (1)
L fll = 2.379 x 10 –4 lbs/yr
Part II: Determine Losses from the Filling of Containers
This step is nearly identical to Part I above with the exception of C blnd , which from the
example is 40% or 0.4. The losses from the filling of the containers can be found from the
following equation:
Where:
L fll = V air * (1 / 359) * (273.15 / T fill ) * (VP MDI / 760) * M w * K MDI * C blnd
Lfll = the emissions from the filling operation in lbs/yr
Vair = the annual volume of displaced air in ft3 /yr
Tfill = the temperature the material is charged or filled at in K
VP =
MDI
the vapor pressure of MDI in mm Hg at the charging/filling temperature
Mw = the molecular weight of MDI (250.26)
KMDI = the adjustment factor to the vapor pressure that is a function of MDI
concentration in the feedstock and/or blend and at the blending/filling
temperature
Cblnd = the proportion of MDI/PMDI in the blend
Step I: Determine Volume Displaced by the Filling of Containers
The total volume of air displaced will be equal to the volume of containers filled.
Therefore:
VTair = (Number containers/year) * (Volume of container)
= (5,000 containers/day x 250 days/year) * (1/2 gallon)
= (625,000 gallons/year)/(7.48 gallons/ft3 )
VTair = 83,556 ft3 Step II: Determine Vapor Pressure at Charging/Blending Temperature VP MDI
VP @ 70 o
F is 6.09 x 10 -6 mm Hg
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