Process for dispersing vaporous hydrogen peroxide

• US 8,497,405 B1
• Filed: 02/28/2013
• Issued: 07/30/2013
• Est. Priority Date: 03/06/2007
• Status: Active Grant

• Current Assignee: Steris Corporation
• Original Assignee: Steris Corporation
• Inventors: Wiget, Paul A., McVey, Iain F., Centanni, Michael A., Meilander, Timothy W.
• Primary Examiner(s): JOHNSON, EDWARD M
• Application Number:
  US13/780,224
• Publication Number:
  US 20130177477A1
• Time in Patent Office: 152 Days
• Field of Search: 588/313, 588/318, 588/405, 588/410, 588/900
• US Class Current: 588/318
• CPC Class Codes: A61L 2/208 Hydrogen peroxide
• CPC Class Codes: A61L 2202/122 Chambers for sterilisation
• CPC Class Codes: A61L 2202/26 Textiles, e.g. towels, beds, cloths

Abstract

The disclosed invention relates to a decontaminant dispenser which may be used as a projectile. The invention also relates to a decontamination process using the decontaminant dispenser. The decontaminant dispenser may be thrown by hand, launched as an artillery shell or the payload for a missile, or dropped by an airplane into the area to be decontaminated. The dispenser may be placed in the area to be decontaminated. The decontaminant dispenser may be ruggedized for use in hostile environments such as those that may be anticipated for military applications.

Claims

1. A process for dispersing vaporous hydrogen peroxide using a decontaminant dispenser suitable for use as a projectile, wherein the dispenser comprises a container suitable for containing propellant grade liquid hydrogen peroxide, the container comprising a container wall with at least one opening in the container wall and a pressure release membrane positioned in the opening, the pressure release membrane being adapted to rupture when pressure within the container exceeds a predetermined value;

and

at least one catalytic probe adapted to be inserted into the container in contact with the liquid hydrogen peroxide, the catalytic probe being undersized so that when inserted into the container in contact with the hydrogen peroxide part of the hydrogen peroxide in the container reacts in an exothermic reaction to form a product composition, the product composition comprising water, oxygen, and unreacted hydrogen peroxide, the reaction being sufficient to generate an expansion of the product composition, the expansion being sufficient to rupture the pressure release membrane and drive the unreacted hydrogen peroxide through the at least one opening,

the process comprising;

filling the container with propellant grade hydrogen peroxide; and

inserting the catalytic probe into the container in contact with the hydrogen peroxide to initiate an exothermic reaction resulting in the formation of a product composition comprising water, oxygen and unreacted hydrogen peroxide, the reaction expanding the product composition sufficiently to rupture the pressure release membrane and drive unreacted hydrogen peroxide through the opening in the container wall.

3. The process of claim 1 wherein from about 50 to about 75 percent by weight of the hydrogen peroxide is converted to water and oxygen in the container.

5. The process of claim 1 wherein the exothermic reaction in the container is sufficient to heat the contents of the container to a temperature in the range from about 120 to about 400°

C.

6. The process of claim 1 wherein the exothermic reaction in the container is sufficient to increase the pressure in the container to a pressure in the range from about 2 to about 35 atmospheres prior to rupturing the pressure release membrane.

7. The process of claim 1 wherein the dispenser is thrown by a person after inserting the catalytic probe into the container.

8. The process of claim 1 wherein the dispenser is launched as a projectile after inserting the catalytic probe into the container.

9. The process of claim 1 wherein the dispenser is dropped from an airplane after inserting the catalytic probe into the container.

10. The process of claim 1 wherein the dispenser is placed in an enclosure after inserting the catalytic probe.

11. The process of claim 1 wherein the dispenser is thrown, launched or dropped into a toxic cloud comprising a chemical and/or biological warfare agent after inserting the catalytic probe into the container.

12. The process of claim 1 wherein the unreacted hydrogen peroxide driven through the opening in the container wall contacts contaminated objects to be decontaminated.

13. The process of claim 12 wherein the contaminated objects comprise one or more of military weapons, clothing, body armor, radio headsets, night vision goggles, computers, test equipment, optical devices, electronic devices and/or communications equipment.

14. The process of claim 12 wherein the contaminated objects are contaminated with one or more chemical, biological, radiological and/or nuclear warfare agents.

15. The process of claim 12 wherein the contaminated objects are contaminated with one or more bacterial spores, vegetative bacteria, viruses, molds and/or fungi.

16. The process of claim 12 wherein the contaminated objects are contaminated with one or more pathogenic chemical agents.

17. The process of claim 12 wherein the step of contacting the contaminated objects with the unreacted hydrogen peroxide comprises a dry process characterized by the absence of condensate formation on the surface of the contaminated objects being decontaminated.

18. The process of claim 12 wherein the step of contacting the contaminated objects with the unreacted hydrogen peroxide comprises a wet process characterized by the formation of condensate in the form of a liquid film on the surface of the contaminated objects being decontaminated.

19. The process of claim 18 wherein the condensate comprises hydrogen peroxide.

20. The process of claim 1 wherein the decontaminant dispenser is ruggedized.

2. A process for dispersing vaporous hydrogen peroxide and gaseous ammonia using a decontaminant dispenser suitable for use as a projectile, wherein the dispenser comprises a container suitable for containing propellant grade liquid hydrogen peroxide, the container comprising a container wall with at least one opening in the container wall and a pressure release membrane positioned in the opening, the pressure release membrane being adapted to rupture when pressure within the container exceeds a predetermined value;

and

at least one catalytic probe adapted to be inserted into the container in contact with the liquid hydrogen peroxide, the catalytic probe being undersized so that when inserted into the container in contact with the hydrogen peroxide part of the hydrogen peroxide in the container reacts in an exothermic reaction to form a product composition, the product composition comprising water, oxygen, and unreacted hydrogen peroxide, the reaction being sufficient to generate an expansion of the product composition, the expansion being sufficient to rupture the pressure release membrane and drive the unreacted hydrogen peroxide through the at least one opening,

wherein the container comprises an inner chamber and an outer chamber, the inner chamber being positioned within the outer chamber;

the inner chamber being suitable for containing propellant grade liquid hydrogen peroxide, the inner chamber comprising an inner chamber wall with at least one inner opening in the inner chamber wall and an inner pressure release membrane positioned in the inner opening, the inner pressure release membrane being adapted to rupture when the pressure within the inner chamber exceeds a predetermined value;

the outer chamber being suitable for containing gaseous ammonia, the outer chamber comprising an outer chamber wall with at least one outer opening in the outer chamber wall and an outer pressure release membrane positioned in the outer opening, the outer pressure release membrane being adapted to rupture when the pressure within the outer chamber exceeds a predetermined value; and

the catalytic probe being adapted to be inserted through the outer chamber into the inner chamber in contact with the liquid hydrogen peroxide,

the process comprising;

filling the inner chamber with propellant grade hydrogen peroxide;

filling the outer chamber with gaseous ammonia; and

inserting the catalytic probe through the outer chamber into the inner chamber in contact with the hydrogen peroxide to initiate an exothermic reaction resulting in the formation of a product composition comprising water, oxygen and unreacted hydrogen peroxide, the reaction expanding the product composition sufficiently to rupture the inner pressure release member and the outer pressure release member and drive unreacted hydrogen peroxide through the inner opening in the inner chamber wall and through the outer opening in the outer chamber wall and drive the gaseous ammonia through the outer opening in the outer chamber wall.

4. The process of claim 2 wherein the mole ratio of hydrogen peroxide in the inner chamber to gaseous ammonia in the outer chamber is in the range from about 1:

1 to about 1;

0.0001.