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RDX Composition and Process for Its Manufacture

a technology of composition and rdx, applied in the field of rdx composition, can solve the problems of efi bridge explosion, system generally unsuitable for use outside the laboratory, and not widely used direct nitration method today

Inactive Publication Date: 2006-12-07
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The direct nitration method is not widely used today for economic reasons.
Discharging such a circuit causes a current of several thousand amperes to flow through the EFI bridge, which in turn causes the EFI bridge to explode.
Such systems are generally unsuitable for use outside the laboratory.
However, each of these explosives has significant problems.
HNS-IV is difficult to manufacture and purify, and therefore is expensive.
CL-20 is expensive and cannot be recrystallized to a very small particle size.
It is therefore just barely sensitive enough for a LEFI application.

Method used

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  • RDX Composition and Process for Its Manufacture
  • RDX Composition and Process for Its Manufacture
  • RDX Composition and Process for Its Manufacture

Examples

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example 1

[0031] RDX crystals were prepared by crash precipitation. Type B RDX was dissolved in acetone to make a 10% by weight solution. A large excess of deionized water was added to this solution with vigorous stirring to precipitate fine particle size RDX. The precipitated RDX crystals were filtered from the liquid and washed. The resulting RDX was dried at 50-55° C. overnight in a drying oven. The measured BET surface area of the precipitated RDX was in excess of 1.2 m2 / g. When examined by light microscope, the RDX crystals appeared to be polycrystalline and orthorhombic. However, when the crystal density of the crash-precipitated RDX was checked by helium pyconometer, the crystal density was found to be 1.69 g / cm3, which is significantly different than the starting material (ca. 1.80-1.82 g / cm3).

[0032] The RDX crystals were successfully detonated in a low-energy exploding foil initiator (LEFI) at 72 mJ (1300 volts, 0.085 μF).

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Abstract

An explosive composition can be produced by dissolving RDX in a volume of a first solvent to form a first solution, and adding a second solvent to the first solution. The second solvent is miscible with the first solvent, but RDX is soluble in the second solvent to an extent no greater than 1 g RDX / 100 g of the second solvent. Precipitated RDX crystals can be recovered. The RDX crystals can have a crystal density of less than 1.80 g / cm3.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates generally to explosives and processes for manufacturing such explosives. [0002] The explosive hexahydro-1,3,5-trinitro-s-triazine is often referred to as RDX. Two processes have been used commercially to manufacture RDX. The first is direct nitration, which produces type A RDX. In this process, hexamethylenetetramine is reacted with nitric acid at 30° C. or less. The direct nitration method is not widely used today for economic reasons. The second process, known as the Bachmann process, is currently the most common method used to manufacture RDX. It produces type B RDX. In this process, hexamethylenetetramine is reacted with nitric acid in the presence of ammonium nitrate and acetic anhydride. [0003] The primary difference between the two types of RDX is that type A is essentially pure, while type B is contaminated with HMX. However, for practical purposes, both processes yield RDX of essentially identical utility. In ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C06B25/34
CPCC06B25/34C06B21/0066C06B23/00C06B25/00C06C5/04C06B25/22
Inventor KNEISL, PHILIPBROCK, KARRI A.
Owner SCHLUMBERGER TECH CORP
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