Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1993-03-08
1994-02-08
Miller, Edward A.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
149124, 588202, C06B 2100
Patent
active
052849953
ABSTRACT:
A method to extract and recover nitramine oxidizers from solid propellant ing liquid ammonia employs four basic steps which are: (1) propellant removal by cutting or eroding into small pieces, followed by, (2) solution of the oxidizers by liquefied gas solvent ammonia, (3) separation of the insoluble binder, metal fuel, and additive components by filtration and recovery of the solid oxidizer by evaporation of the liquefied gas solvent ammonia, and (4) recompression to liquefy the gas solvent for reuse. The process is a closed system with no release of solvent to the environment. Cycle 1 reduces propellant size to 1/4 inch or less to achieve efficient extraction in cycle 2 where insoluble ingredients (binder, metal fuel, additives) are separated from soluble ingredients. Insolubles are recovered and the solubles are recovered in cycle 3 by evaporation of the liquefied gas solvent ammonia. Cycle 4 is a solvent liquefaction and recycling of the liquid ammonia to the closed system. Washing the extracted ingredients in ethanol separates insolubles, nitramine and impurities from solubles, degraded nitroglycerine and other plasticizers. Standard acetone/water or cyclohexanone/water solution is employed for recrystallization of nitramine (HMX and RDX) which are recovered in high purity.
REFERENCES:
patent: H273 (1987-05-01), Melvin et al.
patent: H305 (1987-07-01), Mitchell et al.
patent: 4854982 (1989-08-01), Melvin et al.
patent: 4909868 (1990-03-01), Melvin
Bush Freddie M.
Miller Edward A.
Nicholson Hugh P.
The United States of America as represented by the Secretary of
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