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Methods using fluorosulfones for extinguishing fire, preventing fire, and reducing or eliminating the flammability of a flammable working fluid

a technology of fluorosulfone and working fluid, which is applied in the direction of fire extinguishers, dental surgery, organic chemistry, etc., can solve the problems of ozone depletion, short atmospheric lifetime, low global warming potential, and low toxicity, and achieve the effect of reducing or eliminating the flammability of a flammable working fluid

Inactive Publication Date: 2005-03-10
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for using fluorosulfones to replace commonly-used fire extinguishing agents that contain bromine. These methods can be used to extinguish fire, prevent fire, and reduce or eliminate the flammability of a flammable working fluid.

Problems solved by technology

However, these compounds have been linked to ozone depletion.
Preferably, such substitutes used in such methods will also be low in toxicity, not form flammable mixtures in air, have acceptable thermal and chemical stability for use in extinguishing applications, and have short atmospheric lifetimes and low global warming potentials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Fire Extinguishing Concentration of CF3CF2SO2CF2CF3

[0038] The fire extinguishing concentration of CF3CF2SO2CF2CF3 is determined by the NFPA Standard Cup Burner method. This method is described in NFPA 2001-2003, Annex B.

[0039] Specifically, an air stream is passed at 40 liters / minute through an outer chimney (8.5 cm inner diameter by 53 cm tall) from a glass bead distributor at its base. A fuel cup burner (3.1 cm outer diameter and 2.15 cm inner diameter) is positioned within the chimney at 23.5 cm above the top of the bead distributor. The fire extinguishing agent is added to the air stream prior to its entry into the glass bead distributor while the air flow rate is maintained at 40 liters / minute for all tests. The air and agent flow rates are measured using calibrated rotameters.

[0040] The test is conducted by adjusting the fuel (n-heptane) level in the reservoir to bring the liquid fuel level in the cup burner just even with the ground glass lip on the burner cup. With the ai...

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Abstract

The present invention relates to methods of using fluorosulfones for i) extinguishing fire by applying to the fire such a fluorosulfone, ii) preventing fire in an air-containing enclosed area containing combustible materials by introducing into the area such a fluorosulfone and maintaining the fluorosulfone in an amount sufficient to suppress combustion of combustible materials in the enclosed area, and iii) reducing or eliminating the flammability of a flammable working fluid, by mixing between about 0.1 to about 99 percent by weight of such a fluorosulfone with the flammable working fluid.

Description

CROSS REFERENCE(S) TO RELATED APPLICATION(S) [0001] This application claims the priority benefit of U.S. Provisional Application No. 60 / 494,720, filed Aug. 11, 2003.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to methods for extinguishing fire, preventing fire, and reducing or eliminating the flammability of a flammable working fluid using fluorosulfones. [0004] 2. Description of Related Art [0005] Numerous agents and methods of fire fighting are known and can be selected for a particular fire, depending upon factors such as its size, location and the type of combustible materials involved. Halogenated hydrocarbon fire fighting agents have traditionally been utilized in flooding applications protecting fixed enclosures (e.g., computer rooms, storage vaults, telecommunications switching gear rooms, libraries, document archives, petroleum pipeline pumping stations, and the like), or in streaming applications requiring rapid extingui...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A62C2/00A62D1/00A62D3/38C07C317/02C07C317/04C09K21/08
CPCA62D1/00C07C317/04A62D3/38A62D1/0057C07C317/02
Inventor SIEVERT, ALLEN C.NAPPA, MARIO J.RAO, VALLIYUR NOTT MALLIKARJUNARESNICK, PAUL R.
Owner EI DU PONT DE NEMOURS & CO