Abstract: Methods and systems are provided for treating the tail gas stream of a sulfur recovery plant. The methods including generating a tail gas stream from a sulfur recovery plant, treating the tail gas stream with a hydrogen sulfide removal unit and a hydrogen selective membrane unit, generating a stream low in hydrogen sulfide and a stream rich in hydrogen. The hydrogen sulfide rich stream is recycled to the sulfur recovery unit. The hydrogen selective membrane unit includes a glassy polymer membrane selective for hydrogen over hydrogen sulfide and carbon dioxide.

Abstract: Methods and systems are provided for treating the tail gas stream of a sulfur recovery plant. The methods including generating a tail gas stream from a sulfur recovery plant, treating the tail gas stream with a hydrogen sulfide removal unit and a hydrogen selective membrane unit, generating a stream low in hydrogen sulfide and a stream rich in hydrogen. The hydrogen sulfide rich stream is recycled to the sulfur recovery unit. The hydrogen selective membrane unit includes a glassy polymer membrane selective for hydrogen over hydrogen sulfide and carbon dioxide.

Abstract: A tool comprising a receptacle having a cylindrical portion defining a space therewithin adapted to receive a resilient seal after deformation of the latter by an external member is disclosed. A movable member carried by said receptacle comprises a tubular portion slidably received on the cylindrical portion and movable from a first position in which said tubular portion is opposite the space towards a second position in which said tubular portion is offset relative to the space against the action of a first spring. The tubular member is provided with an aperture adapted to receive the external member, and an element is slidably carried in said space and resiliently urged away from the latter by a pair of second springs, thereby expulsing the seal in a corresponding groove when the tubular member is moved towards its second position.