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TECHNIQUES FOR PRODUCING HIGHLY CONCENTRATED AND PURIFIED SULFUR HEXAFLUORIDE (SF6)

IP.com Disclosure Number: IPCOM000190296D
Publication Date: 2009-Nov-23
Document File: 6 page(s) / 29K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention discloses a method for production of highly concentrated and purified sulfur hexafluoride (SF6) from a mixture of gases in a gas stream. Elimination of other gases (e.g. oxygen and nitrogen) from the gas stream results into a highly concentrated sulfur hexafluoride (SF6) gas stream (e.g. even 50% concentrated SF6 has a great value and also produce a blend of SF6 containing gas) to facilitate reuse.

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RP13168

TECHNIQUES FOR PRODUCING HIGHLY CONCENTRATED AND PURIFIED SULFUR HEXAFLUORIDE (SF6)

BRIEF ABSTRACT

    The present invention discloses a method for production of highly concentrated and purified sulfur hexafluoride (SF6) from a mixture of gases in a gas stream. Elimination of other gases (e.g. oxygen and nitrogen) from the gas stream results into a highly concentrated sulfur hexafluoride (SF6) gas stream (e.g. even 50% concentrated SF6 has a great value and also produce a blend of SF6 containing gas) to facilitate reuse.

KEYWORDS

    Sulfur hexafluoride, SF6, concentrated Sulfur hexafluoride, pressure swing adsorption, PSA, membrane gas separation system, reuse, N2, nitrogen, O2, oxygen, hydro fluorocarbons, HFCs, gaseous dielectric medium, separation, purification, recovery, gas stream

DETAILED DESCRIPTION

    Sulfur hexafluoride (SF6) is an inorganic, non-toxic and non-flammable gas under standard conditions. SF6 is used as a gaseous dielectric medium in the electrical industry, and also magnesium industry uses large amounts of sulfur hexafluoride (SF6) as an inert gas to fill casting forms.

    Further sulfur hexafluoride (SF6) is often used as pure gas but in some cases the sulfur hexafluoride (SF6) can be blended with nitrogen (N2), oxygen (O2), or other gases to reduce the amount of sulfur hexafluoride (SF6) use and

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RP13168

release into the environment. Because sulfur hexafluoride (SF6) is a potent greenhouse gas, with a global warming potential of 22,800 times that of CO2.

    Accordingly the high usage of sulfur hexafluoride (SF6) demands a method of separation and purification for Sulfur hexafluoride (SF6) recovery.

    Figure 1 is a flow diagram illustrating, conventional separation of sulfur hexafluoride (SF6) gas. The conventional separation of sulfur hexafluoride (SF6) from gas mixtures is complex, due to the constraint of very low temperatures or high pressures and sometimes even a suitable combination of both. Further the sulfur hexafluoride (SF6) recovery equipment can become complex and costly. If the recovery system is designed to optimize the cost of construction and operation of the system then recovery efficiencies can also be diminished.

    In conventional methods for separation, purification and recovery of all kinds of gases including fluoro-gases of Sulfur hexafluoride (SF6), Hydro fluorocarbons (HFCs) and per fluorocarbons (PFCs), all mixed gases are liquified and distilled depending on their boiling points. Since the liquification temperatures of gases...