HMX RDX Separation Using Supercritical Dimethylether
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Solution Overview
Problem
Existing methods for separating HMX and RDX from explosives often require harmful organic solvents and generate significant wastewater, making them unsuitable for large-scale production and environmentally friendly processes.
Innovation Solution
A method using compressed dimethylether to selectively dissolve RDX from HMX/RDX-included explosives based on differences in solubility parameters, allowing for the separation of high-purity HMX and RDX without organic solvents, and enabling the reuse of dimethylether.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separation methods using organic solvents and liquid chromatography are employed, then HMX and RDX can be separated, but harmful organic solvents are used and large amounts of wastewater are generated
Solution Approach 1:
The patent changes the physical state of the solvent from liquid to supercritical state by modifying temperature and pressure parameters. This allows the use of dimethylether as a green solvent that can selectively dissolve RDX from HMX/RDX mixtures, achieving high-purity separation without harmful organic solvents or wastewater generation
Solution Approach 2:
The patent introduces supercritical dimethylether as an intermediary substance that selectively interacts with RDX molecules through solubility parameter differences. This intermediary enables the separation of RDX from HMX without requiring harmful solvents, and the dimethylether can be recovered and reused, eliminating environmental harm
2Manufacturing precision
If conventional liquid chromatography absorption method is used, then HMX and RDX can be separated, but a large amount of wastewater is generated
Solution Approach 1:
The patent utilizes phase transition of dimethylether between liquid and supercritical states. By heating and pressurizing dimethylether to its supercritical state for extraction, then releasing pressure to return it to liquid state for filtration and reuse, the method achieves complete solvent recovery with zero wastewater generation while maintaining high separation purity
3Manufacturing precision
If conventional separation methods are employed, then HMX and RDX can be separated, but the process is not suitable for massive production due to complexity and waste treatment requirements
Solution Approach 1:
The patent implements a self-service system where the supercritical dimethylether solvent automatically dissolves RDX from the mixture, then upon pressure release, the RDX crystallizes and the dimethylether is recovered through filtration. This self-regenerating solvent system eliminates the need for complex waste treatment processes and enables scalable mass production while maintaining high separation purity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach achieves high-purity separation of HMX and RDX with reduced environmental impact, eliminating wastewater generation and enabling efficient, rapid large-scale production.
Implementation Method 1
A method using compressed dimethylether to selectively dissolve RDX from HMX/RDX-included explosives based on differences in solubility parameters
Implementation Method 2
crystallizing the RDX included in the RDX solution by discharging the RDX solution to atmospheric pressure, thereby forming RDX particles
Data Source
AI summary
The present invention is directed to a method for effectively separating HMX and RDX from HMX/RDX-included explosives, respectively, without using a harmful organic solvent, the method capable of respectively separating HMX and RDX from HMX/RDX-included explosives by selectively dissolving RDX included in explosives by using a difference between solubility parameters of HMX and RDX with respect to compressed dimethylether. The present invention is further directed to an apparatus for respectively separating HMX and RDX from HMX/RDX-included explosives comprising a dimethylether supplying unit, an explosive particle dissolving unit, and an explosive particle collecting unit.