MDI Emissions Reporting Guidelines for the ... - Polyurethanes

Where:
MDI Emissions Reporting Guidelines for the Polyurethanes Industry
L c = V air * (1 / 359) * (273.15 / T proc ) * (VP MDI / 760) * M w * K MDI
Lc = emissions lb/yr
Vair = annual volume of displaced air in ft3 /yr
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
359 = the molar volume of an ideal gas in ft3 /lb-mole @ 0 o
C and 1-
Vair =
atmosphere
Vpc x Npc Vpc = volume displace per piece
Npc = number of pieces
Therefore:
Vair = annual volume of displaced air in ft3 /year
Tproc = 302.6K
VPMDI = 1.733 x 10 -5 mm Hg at process temperature
Mw = 250.26 (this is the molecular weight of MDI)
KMDI = 0.56
Vair = Vpc x Npc Vpc = 0.17 ft. 3
Npc = 1,500,000 pieces
L c = 2.031 x 10 –3 lb/yr
Process: Closed Foam Density
To estimate the emissions for the manufacture of seat cushions, the formula to
estimate emissions for a closed system given the foam density is used. The equation
is:
Where:
L fd = V air * (1 / 359) * (273.15 / T proc ) * (VP mdi / 760) * MW * K mdi
Lfd = the emissions from the enclosed process in lb/yr
Vair = the annual volume of displaced air in ft3 /year
Tproc = the process temperature in K. This is the maximum temperature of
the MDI tack-free time
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