DEQ-CFW_00087426

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AIR EMISSIONS INVENTORY SUPPORTING DOCUMENTATION
Emission Source ID No.:
INSIG-N1
Emission Source Description:
Nafion® Waste DMSO Storage Tank
Process Description:
This tank is used as an intermediate storage space for disposal of DMSO (dimethyl
sulfoxide) offsite. DMSO is used in the Hydrolysis process and can not currently be disposed of
offite. When the material in Hydrolysis can no longer be used for the process, the chemical is
transferred to the Waste DMSO Storage Tank. From this tank, a truck comes and disposes of the
DMSO solution. The tank is open to the atmosphere with a gooseneck pipe coming off the top
that ends 12" above the diked area.
Basis and Assumptions;_
- Direct vent to atmosphere
- Tank volume = 6000 gallons or 802 ft3
- DMSO vapor pressure = 0.46 mm Hg @ 20°C
- Molar volume of an Ideal Gas @ 0°C and 1 atm = 359 ft3/(lb-mole)
- Molecular Weight of DMSO = 78 (78 lb DMSO / lb -mole DMSO)
- Assume one complete tank volume turnover per day for point source emissions.
- Assume DuPont Good Emission Factor on Equipment Leaks for fugitive emissions
(See Appendix A).
- Flange emissions were used for all equipment except valves and pumps.
Information Inputs and Source of Inputs:
Information
Source
Total shipped DMSO
Catherine Bass, Global Supply Support
(lb/yr) (#5 on State
Inventory Form
Vapor pressure
MSDS #22310402, CAS #67-68-5
Tank volume
Procedure PR-70, W 1535321, or NBPF000351
Number of Each Type
W1535321 and verifying at source
of Equipment
% Production/
Master Production Scheduler (David Garwood) via SAP BW
Quarter (#12 on State
Reporting
Inventory Form)
DEQ-CFW 00087426

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1#1
E
Dimethyl sulfoxide (DMSO)
Point Source Emissions Determination:
Vapor pressure of DMSO = 0.46 mm Hg at 20°C
Mole fraction DMSO in vapor (using Dalton's law):
CAS No. 67-68-5
Mole fraction DMSO = Vapor pressure DMSO = 0.46 mm H = 0.000605 mole DMSO
Total pressure in tank 760 mm Hg mole gas in tank
Molar volume at 0°C and 1 atm = 359 ft3 =>
Pounds of DMSO per tank volume:
Molar volume at 20°C and 1 atm = 385 ft3
802 ft3 * lb -mole * 0.000605 mole DMSO * 78 lb DMSO = 0.098 lb DMSO
tank volume 385 ft3 lb -mole gas in tank mole DMSO tank volume
Total DMSO emissions per year from tank volume:
0.098 lb DMSO * 1 tank volume * 365 days * 1 ton = 0.018 ton DMSO / yr
tank volume day year 2000 lbs
Fugitive Emissions Determination:
Equipment
Component
Number of
Components
Good Factor
I (lb/hr/com onent)
Emissions
(Ib/hr)
Emissions
ton/ )
Pump Seal
1
0.0075
0.0075
0.033
Heavy Li uid Valve
20
0.00352
0.0704
0.308
Open-ended Line
1
0.0215
0.0215
0.094
Flange/Connection
9
0.00031
0.00279
0.012
Total
0.447
Good factor (lb/hr/component) x Number of Components = Emissions (lb/hr)
Emissions (lb/br) x 1 ton / 2000 lbs x 24 br/day x 365 days/year = Emissions (ton/yr)
Total fugitive DMSO emissions per year = 0.447 ton DMSO / year
Emissions Summary:
Point Source Emissions + Fugitive Emissions = Total Emissions
0.018 ton DMSO / year + 0.447 ton DMSO / year = 0.47 ton DMSO / year
DEQ-CFW 00087427