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A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the mem

A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the membrane module is maintained below a critical sulfur dioxide partial pressure, pSO2*, to protect the membrane material from reacting with sulfur dioxide and reducing the oxygen flux of the membrane. Each ion-conducting metallic oxide material has a characteristic critical sulfur dioxide partial pressure which is useful in determining the required level of sulfur removal from the feed gas and/or from the fuel gas used in a direct-fired feed gas heater.

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A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the mem

A method for controlling the sulfur dioxide partial pressure in a pressurized, heated, oxygen-containing gas mixture which is contacted with an ion-conducting metallic oxide membrane which permeates oxygen ions. The sulfur dioxide partial pressure in the oxygen-depleted non-permeate gas from the membrane module is maintained below a critical sulfur dioxide partial pressure, pSO2*, to protect the membrane material from reacting with sulfur dioxide and reducing the oxygen flux of the membrane. Each ion-conducting metallic oxide material has a characteristic critical sulfur dioxide partial pressure which is useful in determining the required level of sulfur removal from the feed gas and/or from the fuel gas used in a direct-fired feed gas heater. bing material, and project or projects forwarding beyond the tool coupling. 8. The medical and/or dental instrument according to claim 7, wherein the sleeve is made of rubber or plastic. 9. The medical and/or dental instrument according to claim 7, wherein the sleeve is made of silicone. 10. The medical and/or dental instrument according to claim 7, wherein the grip sleeve extends forwardly beyond the forward end region of the handpiece. 11. The medical and/or dental instrument according to claim 10, wherein a cross-sectional of the grip sleeve and/or of the sleeve that projects forwardly beyond the tool coupling has a truncated conical shape. 12. The medical and/or dental instrument according to claim 7, wherein a portion of the grip sleeve and/or the sleeve section projecting beyond the tool coupling comprises a separate component which is connected with the grip sleeve or sleeve by a releasable coupling. 13. The medical and/or dental instrument according to claim 12, wherein the releasable coupling comprises a connection selected from the group consisting of a screw connection, a bayonet fastening or a latch connection. 14. The medical and/or dental instrument according to claim 7, wherein the inner surface of the grip sleeve has a structure for reflecting sound waves inwardly. 15. The medical and/or dental instrument according to claim 7, further comprising a plurality of grip sleeve sections and/or sleeve sections which can be selectively mounted, and which differ with regard to their length.