AU703438B2 - Non-flammable gaseous mixture - Google Patents
Non-flammable gaseous mixture Download PDFInfo
- Publication number
- AU703438B2 AU703438B2 AU64212/96A AU6421296A AU703438B2 AU 703438 B2 AU703438 B2 AU 703438B2 AU 64212/96 A AU64212/96 A AU 64212/96A AU 6421296 A AU6421296 A AU 6421296A AU 703438 B2 AU703438 B2 AU 703438B2
- Authority
- AU
- Australia
- Prior art keywords
- gas
- flammable
- composition
- container
- fumigant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Description
-2- This invention relates to a gaseous composition containing a fumigant or sterilising gas which is suitable for compressing into a cylinder.
Many fumigants and sterilising gases are flammable and in order to supply these gases to the market it is necessary to combine a small amount of the gas with a nonflammable liquid such as liquid carbon dioxide. For example, phosphine is marketed as a composition of 2 wt% phosphine in liquid carbon dioxide (C0 2 Such a phosphine composition when contained in a 48 litre cylinder and under appropriate pressure will typically contain about 16.5m 3 of gas at ambient temperature. When the phosphine composition is vaporised, the vaporised gas typically contains about 2.6 vol% PH 3 in
CO
2 It is critical when filling a cylinder with liquid carbon dioxide containing a flammable fumigant or sterilising gas, that the cylinder is not overfilled. Because liquid .ooooi
CO
2 is not capable of being compressed, a cylinder containing too much liquid CO 2 may explode on warming due to the thermal expansion of the liquid CO 2 To ensure that overfilling does not occur it is necessary to individually fill each cylinder by weight.
This is inefficient, time consuming and not cost effective.
It would be desirable to find a non-flammable composition capable of containing a .ooooi flammable fumigant or sterilising gas and which is capable of being compressed into a 0oI cylinder without criticality as to the exact weight added to thereby facilitate filling of a o°0° number of cylinders at the same time.
According to a first aspect of the invention, there is provided a non-flammable gaseous composition which is capable of being compressed into a container adapted for release of the gaseous composition comprising: a non-flammable amount of a flammable sterilising gas or fumigant; nitrogen gas; and carbon dioxide gas wherein said nitrogen gas is present in a concentration sufficient to prevent said carbon dioxide gas from entering the liquid phase when compressed in said container.
According to a second aspect of the invention, there is provided According to a third aspect of the invention, there is provided a method of supplying a fumigant or sterilising gas comprising the step of charging a gaseous composition according to the first aspect into a container under pressure.
Preferably the container is a cylinder equipped with an eductor tube.
Any flammable fumigant or sterilising gas can be used such as phosphine (PH 3 carbonyl sulfide (COS), methyl bromide (CH 3 Br), or ethylene oxide The amount of fumigant or sterilising gas used is limited by the amount that can be o• •tolerated without the liberated gas mixture becoming an explosion hazard. When S• 15 phosphine is used, the amount by volume is typically limited to 2.5% in the gaseous composition when released.
The gaseous composition of the invention is suitable for filling a plurality of containers at the same time, for example, 12 cylinders on a pallet, thereby improving i production capacity.
o:ooo The amount of carbon dioxide present is limited by that value at which liquefaction occurs. Typically amounts up to 65 vol are used. Preferably the amount of carbon dioxide used is toward the higher end of this range as it enables more of the fumigant or sterilising gas to be present.
-4- A preferred composition contains phosphine, 45 to 65 vol carbon dioxide, and to 55 vol of nitrogen.
Clearly the actual amounts used are dependent on the size and maximum pressure rating of the cylinder.
EXAMPLE
A composition containing 2.4%v/v phosphine in a mixture of 60 vol carbon dioxide and 40 vol nitrogen was prepared and compressed into a 48 litre cylinder to a pressure of 163 bar. When in use the gas released from the cylinder will consistently contain 2.4% v/v PH 3 In use it is necessary to replace two cylinders of the existing 2.6% v/v phosphine/liquid CO 2 mixture with three cylinders of this composition in order to supply the equivalent amount of phosphine gas. However, the benefits of being able to compress the gas in a plurality of cylinders at the same time outweighs this small increase in cylinder numbers.
Although the invention has been described with reference only to selected 15 examples and preferred embodiments, it will be appreciated by those skilled in the art that the invention may be embodied in many other forms.
oo* THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:- 1. A non-flammable gaseous composition which is capable of being compressed into a container adapted for release of the gaseous composition comprising: a non-flammable amount of a flammable sterilising gas or fumigant; nitrogen gas; and carbon dioxide gas wherein said nitrogen gas is present in a concentration sufficient to prevent said carbon dioxide gas from entering the liquid phase when compressed in said container.
2. A composition according to claim 1 wherein the fumigant or sterilising gas is phosphine (PH 3 carbonyl sulfide (COS), methyl bromide (CH 3 Br), or ethylene oxide 3. A composition according to claim 1 wherein the gas is phosphine and is present in an amount by volume in the released gaseous composition of 2.5% or less.
4. A composition according to claim 1 wherein an amount of carbon dioxide up to vol% is present.
5. A composition according to claim 1 comprising phosphine, 45 to 65 vol% carbon Sdioxide and 35 to 55 vol% nitrogen.
6. A container containing a compressed gaseous composition according to claim 1.
7. A container according to claim 6 in the form of a cylinder equipped with an eductor tube.
Claims (3)
- 8. A method of supplying a fumigant or sterilising gas comprising the step of charging a gaseous composition according to claim 1 into a container under pressure.
- 9. A method according to claim 8 wherein the container is a cylinder equipped with an eductor tube.
- 10. A method according to claim 8 wherein a plurality of containers are filled at the same time. DATED this 11th day of January 1999 BOC GASES AUSTRALIA LIMITED Attorney: PAUL G. HARRISON Fellow Institute of Patent Attorneys of Australia of BALDWIN SHELSTON WATERS S i ABSTRACT The invention relates to a non-flammable gaseous composition which is capable of being compressed into a container adapted for release of the gaseous composition comprising: a non-flammable amount of a flammable sterilising gas or fumigant; nitrogen gas; and carbon dioxide gas. The invention also relates to a container containing the compressed composition and a method of supplying the composition. a a *eb
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU64212/96A AU703438B2 (en) | 1995-09-11 | 1996-08-22 | Non-flammable gaseous mixture |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPN5366A AUPN536695A0 (en) | 1995-09-11 | 1995-09-11 | Non-flammable gaseous mixture |
| AUPN5366 | 1995-09-11 | ||
| AUPN5609 | 1995-09-25 | ||
| AUPN5609A AUPN560995A0 (en) | 1995-09-25 | 1995-09-25 | Non-flammable gaseous mixture |
| AU64212/96A AU703438B2 (en) | 1995-09-11 | 1996-08-22 | Non-flammable gaseous mixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6421296A AU6421296A (en) | 1997-03-13 |
| AU703438B2 true AU703438B2 (en) | 1999-03-25 |
Family
ID=27155520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU64212/96A Ceased AU703438B2 (en) | 1995-09-11 | 1996-08-22 | Non-flammable gaseous mixture |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU703438B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU730991B2 (en) * | 1996-05-06 | 2001-03-22 | Commonwealth Scientific And Industrial Research Organisation | Fumigation composition and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3707453A1 (en) * | 1987-03-07 | 1988-09-15 | Gero Dr Mayr | Method of pest control |
| WO1991001764A1 (en) * | 1989-07-28 | 1991-02-21 | Allied-Signal Inc. | Sterilizing gas composition comprising monochlorotetrafluoroethane and ethylene oxide |
| EP0595004A1 (en) * | 1992-10-29 | 1994-05-04 | HERCO KÜHLTECHNIK HERMANNS & CO. GmbH | Process for sterilization and recovery of sterilizing gas |
-
1996
- 1996-08-22 AU AU64212/96A patent/AU703438B2/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3707453A1 (en) * | 1987-03-07 | 1988-09-15 | Gero Dr Mayr | Method of pest control |
| WO1991001764A1 (en) * | 1989-07-28 | 1991-02-21 | Allied-Signal Inc. | Sterilizing gas composition comprising monochlorotetrafluoroethane and ethylene oxide |
| EP0595004A1 (en) * | 1992-10-29 | 1994-05-04 | HERCO KÜHLTECHNIK HERMANNS & CO. GmbH | Process for sterilization and recovery of sterilizing gas |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6421296A (en) | 1997-03-13 |
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