MDI Emissions Reporting Guidelines for the ... - Polyurethanes

MDI Emissions Reporting Guidelines for the Polyurethanes Industry
1. The density of the cured foam.
2. The total weight of the MDI-based component in the foam.
3. The temperature of the foam at the tack-free time during the curing process.
The enclosed process losses can be estimated from the following expression since the temperature of
each line is the same:
Where:
L fd = VT air * (1 / 359) * (273.15 / T proc ) * (VP MDI / 760) * M w * K MDI
Lfd = emissions lb/yr
VTair = total annual volume of displaced air in ft3 /year by all lines
Tproc = process temperature in K (maximum temperature of the MDI)
VPMDI = vapor pressure of MDI in mm Hg at process temperature
Mw = 250.26 (this is the molecular weight of MDI)
KMDI = adjustment factor to the vapor pressure that is a function of MDI concentration in the
feedstock and the temperature
359 = the molar volume of an ideal gas in ft3 /lb-mole @ 0 o
C and 1-atmosphere
Step I: Calculate Annual Volume of Displaced Air (V air ) for each Line
V air = (Annual consumption of Polyol/MDI/PMDI)/ (Foam Density)
Line 1: Vair = 1.08 x106 lbs/year / 2.0 lbs/cu. ft. = 5.4 x105lbs/year Line 2: Vair = 1.08 x106 lbs/year / 2.0 lbs/cu. ft. = 5.4 x105lbs/year Line 3: Vair = 10.74 x106 lbs/year / 2.0 lbs/cu. ft. = 5.37 x 106 lbs/year
Line 4: Vair = 11.78 x106 lbs/year / 2.0 lbs/cu. ft. = 5.89 x 106 lbs/year
Total volume displaced equals:
Vtair = Line 1 + Line 2 + Line 3 + Line 4
Vtair = 123.4 x 105 ft3 /yr
Step II: Determine vapor pressure of MDI @ 85 o
F
The vapor pressure of MDI @ 85 o
F is 1.733 x 10 -5 mm Hg
Step III: Determine Temperature of Process in K
Converting 85 o
F to K:
K = ( o
F-32)5/9+ 273.15
K = 302.6
Step IV: Determine Adjustment Factor K MDI
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