DEQ-CFW_00087410

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AIR EMISSIONS INVENTORY SUPPORTING DOCUMENTATION
Emission Source ID No.:
Emission Source Description:
Process Description:
NS-J3
Nafion Semiworks A/E Lab
The Nafion Semiworks A/E lab occasionally hydrolyzes Nafion® membrane. The solution
used to hydrolyze the membrane is a mixture of DMSO/Water/KOH. This operation is carried
out in a five (5) gallon stainless steel tank that is heated to an operating temperature of between
75 deg C and 80 deg C. This process is conducted in a lab hood and all emissions are vented
through the hood (NEP43). This process is run on an as needed basis with a total annual
throughput of 20-40 square meters of Nafion® Membrane.
This process will emit DMSO. For the purpose of this emissions inventory, a very liberal
approach will be taken as to the total amount of DMSO used is liberated to the atmosphere via
evaporation. In reality, DMSO is a very non-volatile compound, with a vapor pressure of 0.5
mm Hg at 25 deg C, and therefore only a fraction of it would volatilize.
Basis and Assumptions:
(1) All DMSO in the hydrolysis solution is volatilized. This assumption is obviously a gross
overstatement of the actual emissions.
(2) The 5 gal stainless steel tank is operated at 50% capacity (2.5 gal) and the hydrolysis
solution is changed out every 2 months. This equates to a total of 15 gallons per year used
in this operation.
Information Inputs and Source of Inputs:
Information Input
Source of Inputs
DMSO Solution Quantity
A/E Lab Technician
Point Source Emissions Determination:
The point source emissions are given on the following page.
DEQ-CFW 00087410

0 Dimethyl Sulfoxide (DMSO)
is
1-1
Quantity of DMSO Generated:
CAS No. 67-68-5
The hydrolysis solution is composed of 30% DMSO, 60% Water; and 10% KOH on a weight ba
The density of the solution is approximately 91bs. per gallon.
Total yearly consumption of solution is 15 gallons.
On a weight basis, this is equivalent to 1351bs of solution (15 gal. x 9 lbs./gal.)
Therefore, the total amount of possible DMSO emitted is 40 Is (1351bs. x 30% = 40 lbs.)
401bs./yr. of DMSO is equivalent to 0.020 tons/yr. of DMSO emitted.
Fugitive Emissions Determination:
N/A
Emissions Summary:
NS43 Nafion® Semiworks No. 3
Nafion® compound
CAS Chemical name
CAS No.
Emission
(pounds)
DMSO
Dimeth 1 Sulfoxide
67-68-5
40
Total VOC Emissions (pounds
40
Total VOC Emissions (tons)
0.02
DEQ-CFW 00087411