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 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 This page in the original is blank.

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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