Emission treatment process from natural gas dehydrators

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 3/10 (2006.01) B01D 53/22 (2006.01) B01D 53/26 (2006.01)

Patent

CA 2716870

The off-gas from the still and flash tank of an existing glycol-based dehydration unit (containing water vapor, methane, BTEX (benzene, toluene, ethylbenzene, xylene), VOCs (volatile organic compounds)) is sent directly to a gas separation membrane system for dehydration. The gas separation membrane has a high selectivity for water over organic compounds (for example, the membrane described in WO2005/007277A1). The driving force for water permeation is established by applying a vacuum on the permeate side of the membrane unit or by flowing a sweep gas, for example warm, dry air through the permeate side of the unit.

Selon linvention, l'effluent gazeux provenant du ballon de distillation et de détente d'une unité de déshydratation à base de glycol existante (contenant de la vapeur d'eau, du méthane, BTEX (benzène, toluène, éthylbenzène, xylène), des COV (composés organiques volatils)) est envoyé directement vers un système à membrane de séparation de gaz pour la déshydratation. La membrane de séparation de gaz a une sélectivité élevée pour l'eau par rapport aux composés organiques (par exemple, la membrane décrite dans le document WO2005/007277A1). La force d'entraînement pour la perméation de l'eau est créée par application d'un vide du côté perméat de l'unité à membrane ou par circulation d'un gaz de balayage, par exemple de l'air tiède et sec, du côté perméat de l'unité.

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