Enthalpy of VX Hydrolysis in Aqueous Sodium Hydroxide Solution at 90 deg C
Abstract
The enthalpy (Delta(H)) or heat of reaction (q sub r) for the hydrolysis of munitions grade VX (0-ethyl S-2-diisopropylaminoethyl methylphosphonothiolate) in aqueous sodium hydroxide (20.4 wt % or 5.01 M) at 90 C was determined in a 2-Liter Mettler RCl Reaction Calorimeter. Typically, VX (680.2 g T 4.1 or 2.548 moles) with dicyclohexylcarbodiimide (DC CDT) as a stabilizer was added to the sodium hydroxide solution (1377.1 g T 5.4) in the reactor at 11.35 g/min. The average normalized enthalpy for nine reactions was -139.6 kJ (S(subN-1)) 4.2)/mole VX. The overall heat transfer coefficient (U sub final) of the final reaction mass was 178.3 (W/(m-sq deg-K)) S(subN-1) 7.7, and the specific heat capacity (Cpr(final)) was 3.6 (kJ/(kg-degK)) S(N-1) 0.2. Further, Delta(H) for the reaction of VX (599.8 +or- 0.40 or 2.25 moles) with diisopropylcarbodiimide (DTCDT) in aqueous NaClH (5.01 M, 1211 g) was -141.2 kJ (S(N-1) 4.7/mole VX. The thermoodynanic quantities (Delta(H) and Cpr) were not significantly different (Student's t-Test, alpha= 0.95) than previous reported data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2005
- Accession Number
- ADA449670
Entities
People
- Elaina H. Harrison
- Philip W. Bartram
- Robert S. Lindsay
- Robin L. Matthews
- Suzanne A. Procell
Organizations
- Edgewood Chemical Biological Center