Non-toxic chemical oxygen generating compositions

• US 5,298,187 A
• Filed: 03/13/1992
• Issued: 03/29/1994
• Est. Priority Date: 03/13/1992
• Status: Expired due to Term

• Current Assignee: BE Intellectual Property, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Puritan Bennett Corp. (Medtronic Plc)
• Inventors: Cannon, James C., Zhang, Yunchang
• Primary Examiner(s): Lovering, Richard D.
• Assistant Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US07/851,171
• Time in Patent Office: 746 Days
• Field of Search: 252/187.31, 252/187.1
• US Class Current: 252/187.31
• CPC Class Codes: C01B 13/0211 Peroxy compounds
• CPC Class Codes: C01B 13/0218 Chlorate
• CPC Class Codes: C01B 13/0296 Generators releasing in a self-sustaining way pure oxygen from a solid charge, without interaction of it with a fluid nor external heating, e.g. chlorate candles or canisters containing them charges per se C01B13/02

Abstract

An oxygen-generating candle composition is disclosed of the type that includes an amount of an alkali metal chlorate or perchlorate oxygen source and which upon initiation and decomposition yields oxygen and residual chlorine, wherein the improvement comprises a non-toxic additive in the candle composition for suppression of the residual chlorine and to enhance uniform oxygen generation and evolution. The additive is selected from the group consisting of from about 0.05% to about 10% by weight of lithium aluminate, metaborate, tetraborate, phosphate or pyrophosphate, metasilicate or orthsilicate, or carbonate, calcium phosphate or pyrophosphate, strontium carbonate or phosphate, or sodium metasilicate or orthosilicate. A metal oxide catalyst, a metal powder fuel, and a binder or filler are also included in the composition.

Claims

1. In an oxygen-generating candle composition that includes a preponderant amount on a weight basis of an alkali metal chlorate or perchlorate oxygen source other than lithium perchlorate alone, together with from about 1.2-30% by weight of a metal fuel powder, selected from the group consisting of iron, cobalt and manganese, and which upon ignition and decomposition thereof will yield oxygen and residual chlorine, the improvement which comprises a non-toxic additive incorporated into the candle composition at a level of from about 0.05-10% by weight for suppression of the residual chlorine and to enhance uniform oxygen generation and evolution, said additive being an alkaline compound selected from the group consisting of compounds of the formula M_a H_b X_c O_d where M=an alkali metal or alkaline earth metal, a=a number which is one or more, H=hydrogen, b=a number which is 0, or one or more, X=an element chosen from the group consisting of the elements of Group IIIA, the elements of Group IVA, the elements identified by the numbers 15 and 51 of Group VA, the elements of Group IVB, the elements of Group VB, the elements of Group VIB, and the element identified by the number 25 of Group VIIB of the Periodic Table, c=a number which is one or more, O=oxygen, and d=a number which is one or more.

2. The oxygen-generating candle composition of claim 1, wherein said additive is an alkaline compound selected from the group consisting of alkali metal and alkaline earth metal aluminates, borates, carbonates, chromates, germinates, hafnates, manganates, molybdenates, niobates, phosphates, silicates, stanates, tantalates, titanates, tungstates, vanadates, zirconates, and derivatives of the foregoing compounds in which the alkali metal and alkaline earth metal cations are partially substituted by hydrogen.

3. The oxygen-generating candle composition of claim 1, wherein said additive is lithium tetraborate.

4. The oxygen-generating candle composition of claim 1, wherein said additive is lithium metaborate.

5. The oxygen-generating candle composition of claim 1, wherein said additive is lithium phosphate.

6. The oxygen-generating candle composition of claim 1, wherein said additive is lithium carbonate.

7. The oxygen-generating candle composition of claim 1, wherein said additive is lithium silicate.

8. The oxygen-generating candle composition of claim 1, wherein the additive is a lithium compound provided in an amount of from about 0.05% to about 5% by weight of the candle composition.

9. The oxygen-generating candle composition of claim 1, wherein the additive is a lithium compound provided in an amount of from about 0.1% to about 2% by weight of the candle composition.

10. The oxygen-generating candle composition of claim 1, wherein the additive is a sodium compound provided in an amount of from about 0.05% to about 5% by weight of the candle composition.

11. The oxygen-generating candle composition of claim 1, wherein the additive is a sodium compound provided in an amount of from about 0.1% to about 2% by weight of the candle composition.

12. The oxygen-generating candle composition of claim 1, wherein the additive is a calcium compound provided in an amount of from about 0.05% to about 10% by weight of the candle composition.

13. The oxygen-generating candle composition of claim 1, wherein the additive is a calcium compound provided in an amount of from about 0.2% to about 4% by weight of the candle composition.

14. The oxygen-generating candle composition of claim 1, wherein the additive is a strontium compound provided in an amount of from about 0.05% to about 10% by weight of the candle composition.

15. The oxygen-generating candle composition of claim 1, wherein the additive is a strontium compound provided in an amount of from about 0.2% to about 4% by weight of the candle composition.

16. The oxygen-generating candle composition of claim 1, wherein is further included a binder selected from the group consisting of glass powder, glass fibers, ceramic fibers, steel wool, and mixtures of the foregoing.

17. The oxygen-generating candle composition of claim 1, wherein is further included a cobalt catalyst in the candle composition.

18. The oxygen-generating candle composition of claim 17, wherein said fuel is powdered iron.

19. The oxygen-generating candle composition of claim 17, wherein said cobalt catalyst is a cobalt oxide.

20. The oxygen-generating candle composition of claim 19, wherein said cobalt catalyst is selected from the group consisting of CoO, Co₃ O₄, Co₂ O₃ and Co_x, wherein x ranges from about 1 to about 1.5, and mixtures of the foregoing.

21. The oxygen-generating candle composition of claim 20, wherein said cobalt catalyst is present in an amount of from about 0.1% to about 5% by weight of the candle composition.

22. In an method of generating breathable oxygen as a result of the initiation and operation of a candle composition that includes a cobalt oxide catalyzed alkali metal chlorate or perchlorate oxygen source other than lithium perchlorate alone, said oxygen source being present in a preponderant amount on a weight basis, said composition having from about 1.2-30% by weight of a metal fuel powder selected from the group consisting of iron, cobalt and manganese, the improved step of adding a non-toxic additive to the oxygen source in order to increase the decomposition temperature of the alkali metal chlorate or perchlorate to a level above the melting temperature thereof that assure steady oxygen generation, said step including introducing into the chlorate or perchlorate before initiation thereof, from about 0.05-10% by weight of an alkaline compound selected from the group consisting of compounds of the formula M_a H_b X_c O_d where M=an alkali metal or alkaline earth metal, a=a number which is one or more, H=hydrogen, b=a number which is 0, or one or more, X=an element chosen from the group consisting of the elements of Group IIIA, the elements of Group IVA, the elements identified by the numbers 15 and 51 of Group VA, the elements of Group IVB, the elements of Group VB, the elements of Group VIB, and the element identified by the number 25 of Group VIIB of the Periodic Table, c=a number which is one or more, O=oxygen, and d=a number which is one or more.

23. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes adding a compound selected from the group consisting of alkali metal and alkaline earth metal aluminates, borates, carbonates, chromates, germinates, hafnates, manganates, molybdenates, niobates, phosphates, silicates, stanates, tantalates, titanates, tungstates, vanadates, zirconates, and derivatives of the foregoing compounds in which the alkali metal and alkaline earth metal cations are partially substituted by hydrogen.

24. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes incorporating a lithium compound selected from said group which is provided in an amount from about 0.05% to about 5% by weight of the candle composition.

25. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes incorporating a sodium compound selected from said group which is provided in an amount from about 0.05% to about 5% by weight of the candle composition.

26. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes incorporating a potassium compound selected from said group which is provided in an amount from about 0.05% to about 5% by weight of the candle composition.

27. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes incorporating a calcium compound selected from said group which is provided in an amount from about 0.05% to about 5% by weight of the candle composition.

28. A method of generating breathable oxygen as set forth in claim 22, wherein the step of introducing an alkaline compound into the alkali metal chlorate or perchlorate oxygen source includes incorporating a strontium compound selected from said group which is provided in an amount from about 0.05% to about 5% by weight of the candle composition.