MDI Emissions Reporting Guidelines for the ... - Polyurethanes

MDI Emissions Reporting Guidelines for the Polyurethanes Industry
Step II: Calculate Maximum Process Temperature in K
The maximum temperature is the oven temperature of 77 o F or;
T proc = 298.2 K
Step III: Determine vapor Pressure of MDI @ 299.8 K (VP MDI )
The vapor pressure @ 298.2 K is 1.00 x 10 –5 mm
Step IV: Determine Adjustment factor (K MDI )
Therefore:
15.0 Packaging
Adjustment factor @ 298.2 K and 25% MDI is 0.33
L c = V air * (1 / 359) * (273.15 / T proc ) * (VP MDI / 760) * M w * K MDI
Lc = (5.35 x 104 ft3 /yr.)(1/359)(273.15 K /298.2 K)(1.00 x 10 –
5mm/760)(250.26)(0.33) Lc = 1.51 x 10 -4 lbs/ yr
Methylenebis (phenyl isocyanate) (MDI) and polymeric diphenylmethane diisocyanate (PMDI)
mixture is used in conjunction with a polyol blend in the packaging of equipment,
appliances, machine parts, etc. to protect them from getting damaged. The system consist
of two parts: Part A is polyol and Part B is diisocyanate mixture. The two parts are mixed in
a customized system that mixes within the dispenser head and the material is dispersed into
a container or cavity containing the equipment, appliance, machine parts, etc. The
container is then placed on a conveyor and transported to the warehouse for storage.
A facility uses 10 million pounds of Polyol/MDI/PMDI blend for the packaging of machine
parts to ship to Europe. The MDI/PMDI is stored in a 10,000-gallon storage tank and
maintained at 25 o
C. The Polyol/MDI/PMDI blend in injected into the containers inside an
assembly room (50 ft. wide x 50 ft. long x 15 ft. high) that is vented through the roof. Since
the container size varies, the targeted density of the foam is 1.5 pounds/ft3 . Determine
the stack emissions.
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