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Apparatus, and components for use in apparatus, for changing the concentration of a selected gas in a liquid, for example for degassing liquids. In one apparatus, the apparatus has a flow channel (a) through which the liquid is passed, and (b) which comprises a wall comprising a planar separation me

Apparatus, and components for use in apparatus, for changing the concentration of a selected gas in a liquid, for example for degassing liquids. In one apparatus, the apparatus has a flow channel (a) through which the liquid is passed, and (b) which comprises a wall comprising a planar separation membrane, and (c) has a height of 0.00025-0.01 and an aspect ratio (width to height) of at least 25:1. One component, which can be used to support a separation membrane, comprises (a) an inner selection plate surface which comprises (i) a selection plate base and (ii) selection plate elements which (a) extend from the base, (b) are separated by intercommunicating selection areas, and (c) have outer surfaces remote from the selection plate base. Another component is a planar separation membrane which comprises (a) a membrane transmission section, and (b) a membrane peripheral member which surrounds the membrane transmission section and which includes location features which facilitate the location of the membrane at a desired position relative to another component.

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1. Apparatus for changing the concentration of a selected gas in a liquid, the apparatus comprising (A) a flow plate comprising (i) a flow chamber (a) through which the liquid can be passed, (b) which has a length of 1.5-4.0 inch, (c) which has a height of 0.00025-0.01 inch, and (d) which has an asp

1. Apparatus for changing the concentration of a selected gas in a liquid, the apparatus comprising (A) a flow plate comprising (i) a flow chamber (a) through which the liquid can be passed, (b) which has a length of 1.5-4.0 inch, (c) which has a height of 0.00025-0.01 inch, and (d) which has an aspect ratio (width to height) of 200:1-500:1,(ii) a flow plate peripheral member which surrounds the flow plate chamber,(iii) an inlet for liquid to enter the flow chamber, and(iv) an outlet for liquid to leave the flow chamber;(B) a selection channel which comprises a selection plate and a selection plate port for maintaining a selection fluid in the selection channel, the selection plate comprising (i) an inner selection plate surface, the inner selection plate surface comprising a selection plate base and selection plate elements which (a) extend from the base, (b) are separated by intercommunicating selection areas which communicate with the selection plate port, and (c) have outer surfaces remote from the selection plate base, and(ii) a selection plate peripheral member; and(C) a planar separation membrane which (a) is substantially impermeable to the liquid and permeable to the selected gas, and(b) comprises (1) a membrane transmission section having a first major surface and a second major surface, and (2) a membrane peripheral member which (i) is part of the separation membrane, (ii) surrounds the membrane transmission section and (iii) includes location features which cooperate with corresponding features on the flow plate and/or the selection plate so that the membrane is correctly located; wherein (1) the flow chamber is at least in part bounded by the flow plate peripheral member and the first major surface of the membrane transmission section, and(2) the selection channel is at least in part bounded by the second major surface of the membrane transmission section, the selection plate base and the selection plate elements. 2. Apparatus according to claim 1 wherein the flow channel has a height of 0.0025-0.0055 inch. 3. Apparatus according to claim 1 wherein the liquid is an HPLC eluent, an analytical sample or an inkjet fluid, and the selection channel contains air under reduced pressure. 4. Apparatus for changing the concentration of a selected gas in a liquid, the apparatus comprising (A) a flow plate comprising (i) a flow chamber through which the liquid can be passed,(ii) a flow plate peripheral member which surrounds the flow plate chamber,(iii) an inlet for liquid to enter the flow chamber, and(iv) an outlet for liquid to leave the flow chamber;(B) a selection channel which comprises a selection plate and a selection plate port for maintaining a selection fluid in the selection channel, the selection plate comprising (i) an inner selection plate surface, the inner selection plate surface comprising a selection plate base and selection plate elements which (a) extend from the base, (b) are separated by intercommunicating selection areas which communicate with the selection plate port, and (c) have outer surfaces remote from the selection plate base, and(ii) a selection plate peripheral member; and(C) a planar separation membrane which (a) is substantially impermeable to the liquid and permeable to the selected gas, and(b) comprises (1) a membrane transmission section having a first major surface and a second major surface, and (2) a membrane peripheral member which (i) is part of the separation membrane, (ii) surrounds the membrane transmission section and (iii) includes location features which cooperate with corresponding features on the flow plate and/or on the selection plate so that the membrane is correctly located; wherein (1) the flow chamber is at least in part bounded by the flow plate peripheral member and the first major surface of the membrane transmission section,(2) the selection channel is at least in part bounded by the second major surface of the membrane transmission section, the selection plate base and the selection plate elements, and(3) the peripheral member of the planar separation membrane (i) is sandwiched between the flow plate peripheral member and the selection plate peripheral member, (ii) directly contacts each of the flow plate peripheral member and the selection plate peripheral member, and (iii) provides a seal between the flow plate peripheral member and the selection plate peripheral member. 5. Apparatus according to claim 4 wherein (A) the membrane peripheral member comprises a plurality of spaced-apart holes, and(B) the apparatus comprises fastening devices which pass through the spaced-apart holes. 6. Apparatus according to claim 4 wherein the flow plate chamber has a height of 0.00025 to 0.01 inch and a width of 0.5 to 5 inch, the width and the height being such that the ratio of the width to the height is at least 250:1. 7. Apparatus according to claim 4 wherein each of the selection plate elements has at least one cross-section which comprises two edge faces each of which is substantially perpendicular to the selection plate base and an outer face which is substantially parallel to the selection plate base and which is connected to each of the edge faces by a curved line. 8. Apparatus according to claim 7 wherein the curved line is a quarter of a circle or a quarter of an ellipse. 9. Apparatus according to claim 4 wherein the location features on the membrane peripheral member are peripheral cut-outs at the edge of the peripheral member and/or areas which are holes in the peripheral member. 10. Apparatus according to claim 4 wherein at least one of the flow plate peripheral member and the selection plate peripheral member has an upstanding irregularity (a) which is 0.025-0.010 inch higher than the face of the peripheral member and is a continuous feature around the entire peripheral member, and (b) around which the separation membrane peripheral member is deformed. 11. Apparatus according to claim 4 wherein the liquid is an HPLC eluent, an analytical sample or an inkjet fluid, and the selection channel contains air under reduced pressure.