Process for the production of speherical tetranitroglycouril

Patent metadata

Field	Value
Publication number	US-9512127-B2
Application number	US-201414499280-A
Country	US
Kind code	B2
Filing date	Sep 29, 2014
Priority date	Sep 29, 2014
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A spherical morphology of the high explosive tetranitroglycoluril (TNGU) has been discovered. This new morphology exhibits approximately a twofold improvement in the response of the material to impact, more than a one and a half fold improvement in friction and the same high resistance to electrostatic discharge over non-spherical TNGU produced by other methods.

First claim

What is claimed is:

1. A process for preparing an at least seventy percent (70%) yield of a spherical tetranitroglycoluril (TNGU) by recrystallization comprising the steps of:
a) dissolving an amount of tetranitroglycoluril (TNGU) in a 100% solution of nitric acid (HNO 3 ) at a temperature of from about 20 to about 25 degrees Celsius to produce a homogeneous solution;
b) stirring the solution while adding below the solution surface, from about 90 to about 100 milliters of a dichloromethane solvent;
c) decanting the supernatant and re-suspending the TNGU in from about 20 to 30 milliliters of the dichloromethane solvent and allowing the precipitated spherical TNGU to settle;
d) washing the precipitated spherical TNGU with from about 20 to 30 milliliters of the dichloromethane solvent four to six times until none of the nitric acid remains; and
e) vacuum drying the resultant spherical TNGU and storing in a dessicator.

2. The process according to claim 1 wherein the spherical tetranitroglycoluril (TNGU) has a diameter of greater than 3 microns.

3. The process according to claim 1 wherein the spherical tetranitroglycoluril (TNGU) has a diameter of from greater than 3 microns to about 10 microns.

4. The process of claim 1 wherein the dichloromethane is added at a rate of about 1 milliliter per minute until the addition of dichloromethane is complete.

5. The process of claim 1 wherein the dichloromethane solvent is 100% dichloromethane.

6. The process of claim 1 wherein the temperature of the tetranitroglycoluril (TNGU) and nitric acid solution is 25 degrees Celsius.

Assignees

• U S Army Res Laboratory Attn: Rdrl-Loc-I
• Us Army

Inventors

• Sherrill William Matthew
• Banning Joseph Erik

Classifications

• C06B45/00

  Compositions or products which are defined by structure or arrangement of component of product (explosive charges of particular form or shape F42B1/00, F42B3/00) · CPC title

• C07D487/04 Primary

  Ortho-condensed systems · CPC title

• C06B25/34

  the compound being a nitrated acyclic, alicyclic or heterocyclic amine · CPC title