Gas transfer membrane

B - Operations – Transporting – 01 – D

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Details

B01D 71/32 (2006.01) B01D 71/30 (2006.01)

Patent

CA 2571498

Porous polymeric membranes formed from a hydrophobic polymer, such as halar having membrane pores of a size sufficient to permit gas and/or vapour permeation 0.05 µm to 5pm without permitting the flow of a hydrophilic fluid across the membrane. Pore distribution is uniform and porosity is high, in some cases up to 80%. Membranes may be in the form of a flay sheet or hollow fibre for example and can be used in a variety of applications such as stripping HF gas, degassing of caustic solution, chlorine gas/alkaline filtration, degassing tap water to remove dissolved chlorine. Processes used to make such membranes can be carried out using relatively non toxic solvents such as citric acid ethyl ester or glycerol triacetate.

Membranes polymères poreuses formées á partir d'un polymère hydrophobique, tel qu'un film Halar ayant des pores de membranes d'une dimension suffisante pour permettre la perméabilité au gaz et/ou á la vapeur d'eau de 0,05 µm à 5 pm sans permettre l'écoulement d'un fluide hydrophylique à travers la membrane. La distribution des pores est uniforme et la porosité est élevée dans certains cas jusqu'à 80 %. Les membranes peuvent avoir la forme d'une feuille plate ou de fibres creuses par exemple et peuvent être utilisées dans de nombreuses applications telles que le stripage de gaz HF, le dégazage de solutions caustique, le filtrage de gaz de chlore et alcalins, le dégazage de l'eau du robinet pour éliminer le chlore dissous. Des processus utilisés pour faire de telles membranes peuvent êtres mis en AEuvre en utilisant des solvants relativement non toxiques tels que l'ester éthylique d'acide citrique ou le triacétate de glycérol.

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