U.S. patent application number 10/901973 was filed with the patent office on 2005-09-01 for use of a microjet reactor for the production of initiating explosive.
Invention is credited to Bley, Ulrich, Brede, Uwe.
Application Number | 20050188874 10/901973 |
Document ID | / |
Family ID | 33547045 |
Filed Date | 2005-09-01 |
United States Patent
Application |
20050188874 |
Kind Code |
A1 |
Brede, Uwe ; et al. |
September 1, 2005 |
Use of a microjet reactor for the production of initiating
explosive
Abstract
What is described is the use of a microjet reactor for the
production of initiating explosive, each of the starting solutions
for explosive production in the microjet reactor being injected
through a nozzle onto a common collision point into a reactor space
enclosed by a reactor housing, a gas being admitted into the
reactor space via an opening, and the resulting initiating
explosive crystals being removed from the reactor housing together
with the liquid and excess gas through a further opening.
Inventors: |
Brede, Uwe; (Fuerth, DE)
; Bley, Ulrich; (Furth, DE) |
Correspondence
Address: |
ANTONELLI, TERRY, STOUT & KRAUS, LLP
1300 NORTH SEVENTEENTH STREET
SUITE 1800
ARLINGTON
VA
22209-3873
US
|
Family ID: |
33547045 |
Appl. No.: |
10/901973 |
Filed: |
July 30, 2004 |
Current U.S.
Class: |
102/205 |
Current CPC
Class: |
C06B 21/0008 20130101;
C06C 7/00 20130101; C06B 21/0066 20130101; C06B 41/00 20130101 |
Class at
Publication: |
102/205 |
International
Class: |
F42B 003/10 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 31, 2003 |
DE |
10334992.8 |
Claims
1. Use of a microjet reactor for the production of initiating
explosive, each of the starting solutions for explosive production
in the microjet reactor being injected through a nozzle onto a
common collision point into a reactor space enclosed by a reactor
housing, a gas being admitted into the reactor space via an
opening, and the resulting initiating explosive crystals being
removed from the reactor housing together with the liquid and
excess gas through a further opening.
2. The use according to claim 1, characterized in that the nozzle
diameter is 10 to 1000 .mu.m.
3. The use according to claim 2, characterized in that the nozzle
diameter is 50 to 100 .mu.m.
4. The use according to claim 1, characterized in that the total
throughput is 10 to 1000 mL/minute.
5. The use according to claim 4, characterized in that the total
throughput is 50 to 500 mL/minute.
6. The use according to claim 1, characterized in that the
initiating explosive obtained is potassium dinitrobenzofuroxanate,
lead azide, lead picrate, lead trinitroresorcinate or cesium
dinitrobenzofuroxanate.
Description
[0001] This invention relates to the use of a microjet reactor for
the production of initiating explosive.
[0002] Many initiating explosives are produced by mixing at least
two starting solutions and precipitating the explosive in
crystalline form from this mixture. Through the selection of the
reaction parameters (temperature, motion of the mixture), an
attempt is made to obtain definite, reproducible crystal sizes in
the precipitation. This is problematic, however, because it is
difficult to control the temperature and the guidance of the motion
of a precipitation bath on a large scale. Temperature gradients
come into being within the precipitation vessel, and the
crystallization is additionally affected by stirring motions. The
liquid is often drained after a predetermined precipitation time
and the crystalline material is filtered out and fractionated by
screening. The possibilities for reproducibly obtaining a definite
grain-size distribution with this precipitation method are very
limited. As a rule, the grain-size distributions obtained lie in a
range of up to two orders of magnitude.
[0003] For primers in the motor vehicle safety field, initiating
primers or initiating explosives with very small and reproducible
crystal dimensions (typical sizes of <30 .mu.m) are needed so
that good thermal coupling can be effected between the electrical
heating resistances and the crystals. In other applications of
initiating explosives it is also desirable that many small crystals
be in contact with the igniting resistance in question.
[0004] It is an object of the invention to overcome the
disadvantages of the existing art and to create a method for the
production of initiating explosive that leads in particular to very
small crystals (for example in the range of 0.5 to 30 .mu.m,
preferably 1 to 20 .mu.m, particularly preferably 1 to 10 .mu.m),
the crystal size obtained being largely controllable through
adjustment of the process parameters and the grain-size spectrum
being adjustable to be narrow and well-defined.
[0005] This object is achieved through the use of a microjet
reactor for the production of initiating explosive, each of the
starting solutions for explosive production in the microjet reactor
being injected through a nozzle onto a common collision point into
a reactor space enclosed by a reactor housing, a gas being admitted
into the reactor space via an opening, and the resulting initiating
explosive crystals being removed from the reactor housing together
with the liquid and excess gas through a further opening. A
microjet reactor is described, for example, in WO 00/61275,
reference being expressly made here to the entire content of the
disclosure of this publication.
[0006] Surprisingly, it was found that when a microjet reactor is
used for the production of initiating explosive, the initiating
explosive can be won in a narrow, well-defined and adjustable
grain-size spectrum. In particular, it is possible in this way to
obtain a initiating explosive with crystal sizes between 0.5 to 30
.mu.m.
[0007] The size of the explosive crystals generated in
precipitation can be reproducibly controlled by varying the
operating parameters. To this end, the diameters of the
reactant-supplying nozzles, the pump pressure, the temperatures and
concentrations of the starting solutions, and the quantity of
auxiliary gas can be varied. The nozzle diameter is preferably 10
to 1000 .mu.m, particularly preferably 50 to 500 .mu.m, and most
particularly preferably 50 to 100 .mu.m. The total throughput is
preferably 10 to 1000 mL/minute, particularly preferably 50 to 500
mL/minute.
[0008] The following initiating explosives can preferably be
produced through the use according to the invention: potassium
dinitrobenzofuroxanate, lead azide, lead picrate, lead
trinitroresorcinate and cesium dinitrobenzofuroxanate.
[0009] A further advantage of the use according to the invention is
that fractional (and hazardous) screening can be omitted because of
the well-defined crystal size of the initiating explosive.
[0010] The subject of the invention will be explained in greater
detail with reference to the following Example.
EXAMPLE 1
Production of Potassium Dinitrobenzofuroxanate in the Microjet
Reactor
[0011] In a microjet reactor with a reactor space 2 mm in diameter
and 50 mm long, via two nozzles with a nozzle diameter of 100
.mu.m, a sodium dibenzofuroxanate solution with a temperature of
23.degree. C. and a concentration of 20 g/L and a potassium nitrate
solution with a temperature of 23.degree. C. and a concentration of
30 g/L were brought together with a nozzle pressure of 100 bar at
each nozzle. Air was used as transporting gas. After two minutes'
reaction, approximately 1 L of reaction liquid containing
approximately 5 g of finely divided potassium
dinitrobenzofuroxanate was obtained.
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