DEQ-CFW_00088106

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APFO Process Air Emissions Inventory Column Condenser
Page 1 of 3
Column Condenser
Emissions From
Condenser of Distillation
Column
# of Flanges
10
Leakage rate for
combine flange
0.0006
and valve -worst
case (lb/hr)
MW of air verses
fluorochemical
0.173
(28.8/166)
Ibs of air leakage
into column
0.0010
(Ibs/hr)
Ibs/90 days
2.25
moles/90 days of
air leakage into
0.078
column
Ibs/90 days of
C7F15COF into
2.707
column
Equivalent HF
quantity
0.130
(Ibs/90days)
Scrubbing
98%
Efficiency
C7F15COF (Ibs/90
0.05
days)
HF Ibs/90 days)
0.003
Emissions From Column of
Distillation Column
# of Flanges
6
Leakage rate for
combine flange
0.0004
and valve -worst
case (lb/hr)
MW of air verses
fluorochemical
0.173
(28.8/166)
Ibs of air leakage
into column
0.0004
(Ibs/hr)
Ibs/90 days
0.90
moles/90 days of
air leakage into
0.031
column
Ibs/90 days of
C7F15COF into
1.083
column
Equivalent HF
quantity
0.052
(Ibs/90days)
Scrubbing
98%
Efficiency
C7F15COF (Ibs/90
0.02
days)
HF Ibs/90 days)
0.001
Emissions From Misc
Transmitters of
Distillation Column
# of Flanges
20
Leakage rate for
combine flange
0.0002
and valve -worst
case (lb/hr)
MW of air verses
fluorochemical
0.173
(28.8/166)
Ibs of air leakage
into column
0.0007
(Ibs/hr)
Ibs/90 days
1.50
moles/90 days of
air leakage into
0.052
column
Ibs/90 days of
C71715COF into
1.804
column
Equivalent HF
quantity
0.087
(Ibs/90days)
Scrubbing
98%
Efficiency
C7F15COF
0.04
(Ibs/90 days)
HF Ibs/90 days)
0.002
DEQ-CFW 00088106

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APFO Process
Pressurizing Column for
dumping of the reboiler
Heels
# of times heels
dumped
9
lb moles of air
1.47
Ibs of C71`15COF
before scrubbing
50.84
Ibs of C7F15COF
1.017
after scrubbing
Ibs of HF before
scrubbing
2.44
Ibs of HF after
scrubbing
0.049
Air Emissions Inventory
Column Condenser
Page 2 of 3
(NOTE: the following are just example calculations, different numbers may have been used)
Emissions from Condenser of Distillation Column
Modeling 100% C7F15COF, MW=416,
Source Condenser of Distillation Column
emp of brine is between -1 ❑ to 3❑C
ume of Pot 250 gallon Maximum size, Column 8" ID by 50 ft. Total vapor volume 33.4 ft3
# Of Flanges: Bottom valve, up to ten two-inch nozzles.
(Leakage rate for combined flange and valve -worst case 0.0006lb/hr.)
Adjusting for molecular weight of air versus fluorochemical for this basis (9/22/95 HFPO expansion
Project Permit) We will calculate an inlet leak rate of air.
(ten flanges/valves) ❑ 0.0006 pounds/hr ❑ (28.8/166) ❑ 365 days/year 1124 hours/day
= 9.1 pounds/year of air leakage into Vessel. For 90 days assume 2.3 pounds of air
10" Column — 6 flange sets = (6 flange sets) ❑ (0.0004 Ib/hr) ❑ (28.8/166) = 0.000042 Ib/hr,
7000 hours ❑ 0.000042 Ib/hr = 2.9 lb/year of air. For 90 days assume 0.72 pounds of air
(Under vacuum 7000 hours)
20 2" or smaller nozzles,
(Misc. transmitters) 20 ❑ 0.0002 ►b/hr ❑ (28.8/166) = 0.00069 Ib/hr,
7000 hours ❑ 0.00069 Ib/hr = 4.9 lb/year For 90 days assume 1.2 pounds of air.
DEQ-CFW 00088107

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APFO Process Air Emissions Inventory Column Condenser
Page 3 of 3
Total air Leak in 9.1 lb + 2.9 + 4.9 = 16.8 lb of air per year or 0.58 lb -moles of air per year:
For 90 days assume 0.14 lb moles of air
Heels of Distillation Column were drained ten times over X batches. During this period column is
brought up to X pressure with nitrogen. Volume is 33.5 ft3; therefore moles =X* (58.5 ft3/wk) / (359
ft3/lb/mole) = Y pound moles of air + 0.14=1.74 lb moles of air
Vapor pressure of C7F15COF at 5❑C for an approach temperature for 0❑C brine, assume 10 mm
Hg
Assuming vacuum of 120 mm Hg, partial pressure of 10 mm Hg (Overly conservative -more accurate
would be to calculate in increments)
(10/120) ❑ (1.74 lb-moles/year) ❑ (416 lb/lb-mole) = 60 lb VOC passing through the condenser, on
to the vacuum and then on to the scrubber.
Equivalent HF quantity = (60 lb/lb-mole) / (416 lb/lb-mole) ❑ (20 lb/lb mole)= 2.9 pounds/90 days
DEQ-CFW 00088108