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OCR for page 65
Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
Appendix B
Mass Balance for the Newport Chemical Agent Disposal Facility (NECDF) Process
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Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
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Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
FIGURE B-1 Process flow diagram for the integrated NECDF process.
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Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
TABLE B-1 NECDF Inputs for Process Mass Balance (stream numbers correspond to streams identified in Figure B-1 )
Process Inputs
Description
Agent in Ton Containers
50% NaOH Solution
Oxidant to SCWO
Nitrogen to Neutralization Vessels
Process Air to TCC
Total Inputs
Stream Number
1
2
3
N/A
N/A
N/A
Total Flow (kg/1,000 kg agent)
1,000
1,195
3,500
7
5,667
11,369
Physical State
liquid
liquid
vapor
vapor
vapor
temperature (°F)
70
80
70
70
70
pressure (psig)
14.7
14.7
3,500
17.7
100
Vapor Components
oxygen (kg/1,000 kg agent)
3,500
1,190
4,690
nitrogen (kg/1,000 kg agent)
7
4,477
4,484
Liquid Components
VX (kg/1,000 kg agent)
957
957
agent impurities (kg/1,000 kg agent)
44
44
NaOH (kg/1,000 kg agent)
598
598
Water (kg/1,000 kg agent)
598
598
Solid Components
TC shells (no./1,000 kg agent)
1.5
1.5
TC valves (no./1,000 kg agent)
2.9
2.9
TC plugs (no./1,000 kg agent)
8.8
8.8
Source: Adapted from Stone and Webster, 1997b.
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Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
TABLE B-2 NECDF Outputs for Process Mass Balance (stream numbers correspond to streams identified in Figure B-1)
Process Outputs
Description
Ton Container Parts
TCC Air Dry Vent
Neutralization Reactors Vent
Hydrolysate Tanks Vent
SCWO Vapor Effluent
Salt Solids to Disposal
Discharge to STP
Total Outputs
Stream Number
4
N/A
5
6
7
8
9
Total Flow (kg/1,000 kg agent)
5,667
6
1
3,121
1,531
1,043
11,369
Physical State
solid
vapor
vapor
vapor
vapor
solid
liquid
temperature (°F)
46
40
80
95
100
pressure (psig)
18
21
15
15
15
Vapor Components
oxygen (kg/1,000 kg agent)
1,190
1,803
2,993
nitrogen (kg/1,000 kg agent)
4,477
6
0.3
4,483.3
VOCs (kg/1,000 kg agent)
0.4
1,165
1,165.4
carbon dioxide (kg/1,000 kg agent)
82
82
nitrous oxide (kg/1,000 kg agent)
0.1
0.1
inorganic impurities (kg/1,000 kg agent)
10
10
Solid/Liquid Components
Na2SO4 (kg/1,000 kg agent)
70
451
1,043
1,574
Na2HPO4 water (kg/1,000 kg agent)
530
530
TOC (kg/1,000 kg agent)
0.1
0.1
inorganic impurities (kg/1,000 kg agent)
10
10
TC shells (no./1,000 kg agent)
1.5
1.5
TC valves (no./1,000 kg agent)
2.9
2.9
TC plugs (no./1,000 kg agent)
8.8
8.8
Source: Adapted from Stone and Webster, 1997b.
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Using Supercritical Water Oxidation to Treat Hydrolysate from VX Neutralization
TABLE B-3 Water Formation Resulting from the Neutralization of VX and Oxidation of the Hydrolysate during the NECDF Process
Water is formed in the neutralization supercritical water oxidation (SCWO), and pre-evaporation pH adjustment processes. The following illustrates this water formation by showing that elemental hydrogen enters the process in water and other compounds but exits the process mostly as water.
The elemental hydrogen inputs to process are for 1,000 kg of agents.
Stream
Constituents
Hydrogen Content
Agent
1,000 kg VX
98 kg
50% NaOH solution
598 kg NaOH
598 kg H2O
15 kg
67 kg
Total
2,195 kg
180 kg
Notes: For simplification, the agent is assumed to be pure VX, with a molecular weight of 267 and a molecular formula of C11H26O2NPS. The 50% NaOH solution flow shown here includes all caustic to the process, both for neutralization and for post-treatment.
The only product other than water that contains hydrogen is the phosphate salt in stream number 8, Figure B-1, salt solids to disposal, which contains
530 kg Na2HPO4/1,000 kg of agent = 4 kg H/1,000 kg of agent
The balance of hydrogen:
180 - 4 = 176 kg H/1,000 kg of agent
is reacted with oxygen present throughout the process to form water.
The resulting water is found in the following output streams (per 1,000 kg of agent).
Stream
Water Content
Hydrogen Content
SCWO vapor effluent
70 kg H2O
8 kg
Salt solids to disposal
461 kg H2O
51 kg
Discharge to STP
1,043 kg H2O
116 kg
Total
1,574 kg H2O
175 kg
The total amount of water formed in the process is water out minus water in.
1,574
- 598
976 kg H2O/1,000 kg of agent
Source: Stone and Webster, 1997b
Representative terms from entire chapter:
necdf process
