Document 06NRLyXaRBpgZnBgDRw7Y7E1x
PPG INDUSTRIES, INC. CHEMICAL DIVISION-U.S. LAKE CHARLES, LOUISIANA
LD 1863 07-07-1978 DYER, S
/L&rO^
IDENTIFICATION OF PER-TRI STILL LINE VENT FLOWS (PART OF THE VDC EMISSION CONTROL P-746)
Distribution
1. 2. 3* 4.
5 6.
7. 8. 910. .-14. 15 * 16.
John Fike T. G. Taylor H. J. Hoenes, Jr. M. Clary
R. Jacobs B. AT Leman
G. Jordan E. Gorton P-746 Central Files - G.O. Technical Files Technical Information Coordinator Author: Scott Dyer
Key Words Per-Tri Still Vents VDC Emissions
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LABORATORY DEPARTMENT SCOTT DYER
TECHNICAL REPORT JULY 7, 1978
IDENTIFICATION OF PER-TRI STILL LINE VENT FLOWS (PART OF THE VDC EMISSION CONTROL P-746) LD-I863
INTRODUCTION
The laboratory was requested to determine the flow rate and composition of the three still vents at Per/Tri: Nos. 1 and 2 Per Stills Vent, Heavies Still Vent, and the combined vent from the Per/Tri Still and Nos. 1 and 2 Tri Stills. Samples from the three vents were analyzed for weight percent of chlorinated organics. The composition of the vent in lb/day was then calculated.
ABSTRACT
The three still vents at Per/Tri were analyzed for total flow rate and chlorinated organics. A helium tracing technique was used to determine the flow rate and standard G.C. procedures were used to analyze for N2 and chlorinated organics. The flow rate and major components of each vent are shown below.
Component
Nitrogen Hydrogen Chloride Ethyl Chloride Vinylidene Chloride trans-1,2-Dichloroethylene cis-1,2-Dichloroethylene Chloroform 1,2-Dichloroethane 1,1,1-Trichloroethane Carbon Tetrachloride Trichloroethylene 1,1,2-Trichloroe thane Perchloroethylene
Flow Rate
Nos. 1 and 2 Tri Still and Per/Tri Still Vent lb/day
289.9" -
0.7 162.2 ^ 405.8--^ 134.2^
10.8 1.7 0.2
22.3 40.6 --
0.2 2.9
272 scf/hr
Nos. 1 and 2 Per Still Vent lb/day
213.1 ' 174.0
-
-
0.02 0.05
Heavies Still Ve] lb/day
558.2 ^ 82.3
. -
1.2 1.2
--
0.2
0.2
185-3 -- 48.5
165.8
--
30.5 20.6 511.4^
227 scf/hr
384 scf/h:
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EXPERIMENTAL
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I. Gas Chromatographic Method for Helium
A. G.C. Conditions
Instrument:
Fisher Gas Partitioner
Column:
6* of activated carbon in 1/8" nickel tubing followed by 6' of 13X Molecular Sieve in 1/8" nickel tubing.
Carrier Gas and Flow Rates:
Argon at 45 cc/min
Detector Current;
6.7 ma
Method of Injection:
0.25 cc gas sample loop
Recorder:
Strip chart, one millivolt full scale
Attenuation;
50
B. Standard Plot of $> Volume Helium vs peak Height
Four cylinders of known $ volume He with Argon balance were used to determine the standard curve. Samples were injected from the cylinder directly into the sample loop. At attenuation 50 the following peak heights were obtained from the standards.
% Volume He
Average Peak Height in mm
9.94
3-95 1.4o 0.48
60
29 12
4
The standard plot of peak height vs percent volume He is shown in Figure 1.
C. Injection of He into Vent
A known amount of He was injected into the vent line upstream from the sample point. This was done using a Matheson flow regulator Model No. 8289-0406 and a pressure regulator set at 60 psig. A graph of flow rate in scftn vs settings on the flow meter is shown in Figure 2. For this study a setting of 40 gave a flow rate of O.33 scftn. This same flow rate was used for a.11 three vents.
Si
O 'I
N D 3 J O -Z C L IE T Z G E N G R A P H P A P E R
E U G E N E E IIE T Z D E N C D .
-2 C L D IE T Z G E N uR A P H PAPER
i
EU G EN E D IE T Z G E N CD.
ld-1863/6
I. D. Sampling and Analysis
Samples used to determine the flow rate (He tracing) were caught in evacuated cylinders that had previously been purged with Argon. The samples were taken at 15 minute intervals to insure good mixing of the He and vent gases.
A 50 cc syringe was used to draw a sample from the cylinder. This was done by first placing a septum over the end of the cylinder and purging the syringe three times with 20 cc of sample before withdrawing 15 cc of sample. The 15 cc of sample was then used to purge the sample loop. The height of the peak is then measured in mm and the $ volume He determined from the plot on Figure 1.
E. Calculations
Since the tracing is simply a dilution, the following equation can be used:
($ Vol He)(Total Flow) = (100$ Vol He)(0.33 scfm)
Total Flow Example:
(100$ Vol He)(O.33 scfm) (% Vol He)
Total Flow = (100$ Vol He)(0.33 scfm) (10$ Vol)
3.3 scfm
II. G.C. for Chlorinated Organics
A. G.C. Conditions
G.C.:
Varian 3700
Column: Detector:
0.2$ Carbowax 1500 on 60/80 Carbopak C in nickel tubing
TC
Detector Temperature:
280C
Detector Current:
190 ma
Column Temperature: Flow Rate:
80C for 8 min then 8/min up to 175C 32 cc/min He
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II B. Sampling and Analysis
LD-1863/7
The cylinders that were analyzed for He were also used to analyze for chlorinated organics. After the He analysis the cylinders were pressurized to 15 psig with He. The sample was then injected using a gas sample loop. The results were calculated as weight $ for the different components.
C. Calculations
The sample weight is assumed to he 100 g (total weight % = 100)
then the following conversions are used to calculate lh/hr. Per from the Heavies Still Run is used as an example.
1. wt % of component (g) = moles molecular wt (g/mole)
^516 (g)
= 0.255 moles p
165.83 (g/mole)
Per
2. Total moles of sample
= 2.129 moles,
(Sum of number of moles of each component)
0
3 * moles pPT
= mole fraction = volume fraction
moles total
moj~es = 0.120 mole fraction
2.129 mo es
(volume fraction)
4. (Volume fraction)(Total flow scfh) = scfh per
(0.120)(384.48 scfh) = 46.14 scfh Per
5- (scfh p^)(28.52jg. = _J__per
(*46.14 scfV28.32= 1306.68 j2
hr scf /
hr
> A306.68 jZ\(i moleV165.83 gVl lb \ =
21.31 lb
\ ^y\22.4 A mole V+54 g /
hr
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LD-1863/8
RESULTS AMD DISCUSSION
The following results were obtained for the three vents. The samples were
taken during normal operations of each still; the weight % shown is the average of three samples spaced at 15 minute intervals.
The flow rate was determined using a He tracing method. Weight % organic
analysis was done using standard G.C. methods and converted to lbs/day for each component.
Table 1. Per/Tri Still and Nos. 1 and 2 Tri Stills Vent
Component
Wt %
lb/hr
lb/day
Nitrogen Ethyl Chloride Vinylidene Chloride trans-1,2-Dichloroethylene cis-1,2-Dichloroethylene Chloroform 1,2-Dichloroethane 1,1,1-Trichloroethane Carbon Tetrachloride Trichloroethylene 1,1,2-Trichloroethane Per chloroethylene
Flow rate = 272 scfh
27-08 0.07
15-08
37-77 12.63
1.04 0.15 0.02 2.19
3.79 0.03 0.14
12.1 0.03 6.8
16.9
5-6 0.4 0.07 0.01 0.9
1.7 0.01 0.1
289.9
0.7 162.2 405.8 134.2
10.8
1.7 0.2 22-3 40.6 0.2
2.9
Average He Peak Height a 4-7.3 U3H1
Still
p/t No. 1 Tri No. 2 Tri
Feed gpm
70 15-5 25-5
Reflux SEP1
72 58 68
Recycle
_ 1.8 2.0
Steam lb/hr
9800 5600 8900
Vent Press, psig
0.1 0 0
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Table 2. Nos. 1 and 2 Per Stills Vent
LD-1863/9
Component
Wt i
lb/hr
lb/day
Nitrogen Hydrogen Chloride Chloroform 1,2-Dichloroethane Carbon Tetrachloride Trichloroethylene 1,1,2-Trichloroethane Perchloroethylene
27-01
22.07 0.01 0.01 0.03
23*34 6.32
21.14
8.9 7.2 0.001 0.002 0.01
7-7 2.0
6-9
213.1 174.0
0.02 0.05 0.2
185.3
48.5 165.8
Flow rate = 227 scfh
Average He Peak Height = 54.3 mm
Still
Feed gpm
Reflux gpm
Recycle gpm
Steam lb/hr
Overhead Press, psig
No. 1 Per No. 2 Per
15-5 16.5
20 21
1-5 2800 0 4900
0.2 0.1
Table 3. Heavies Still Vent
Component
Wt %
lb/hr
lb/day
Nitrogen Hydrogen Chloride trans-1,2 -D ichioroethylene cis-l,2-Dichloroethylene 1,2-Dichloroethane Trichloroethylene 1,1,2-Trichloroethane Perchloroethylene
Flow rate = 38k scfh
46.25 6.83 0.09 0.12 0.01 2.70 1.70
42.32
23-3 3.4 0.05
0.05 0.01
1-3 0-9 21.3
558.2 82.3 1.2 1.2 0.2
30.5 20.6 511.4
Average He Peak Height = 37.3 mm
Still
Feed gpm
Reflux gpm
Recycle gpm
Steam lb/hr
Vent Press, psig
No. 1 Per No. 2 Per Heavies
9 12 42
20 21 300
3 2,700 4 4,600
- 38,000
0.2 0 1.6
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I
CONCLUSIONS
LD-1863/10
1. The flow rates for the Per/Tri Still line vents were determined using a He tracing technique.
2. The composition of the vents were determined using standard G.C. methods.
3. Flow rate and analysis data were used to calculate the lb/day of each component in these vents.
Author:
^
Scott Dyer
Approved:
( cuCf
Earl Gorton
Approved: v Sf-'Q. v.
,,
H. j/'Hoenes, Jr.
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7-/.?r yg'
Date
'y-0-18
Date
7//i/7i
Date
rw
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