Process for removing contaminants from gas using...

Details Process for removing contaminants from gas using... Process for removing contaminants from gas using...

B - Operations, Transporting

01

D

B01D 53/14 (2006.01)

Patent

CA 2391256

The present invention provides a process for removing gas contaminants such as hydrogen sulfide and carbon dioxide from a product gas such as natural gas or synthesis gas. According to the invention the product gas is contacted with a solvent which includes dialkyl ethers of polyethylene glycols and water, and a high pressure recycle loop is utilized to desorb a portion the gas contaminants and co-absorbed product gas from the solvent. The solvent is provided with an amount of water sufficient to increase recovery of co-absorbed product gas while at the same time providing a reduced circulation rate requirement for the solvent and reduced re-compression and cooling requirements for the recycle gas.

Cette invention concerne un procédé permettant d'extraire des substances contaminantes gazeuses telles que de l'hydrogène sulfuré ou du dioxyde de carbone d'un produit gazeux tel que du gaz naturel ou du gaz de synthèse. Ici, le produit gazeux est mis en contact avec un solvant contenant des dialkyl éthers de polyéthylène glycols et de l'eau, cependant que l'on utilise une boucle de recyclage haute pression pour désorber du solvant une partie des substances contaminantes gazeuses et le produit gazeux co-absorbé. Le solvant est additionné d'un volume d'eau suffisant pour accroître la récupération du produit gazeux co-absorbé et réduire parallèlement les exigences de débit de recirculation du solvant ainsi que les besoins de recompression et de refroidissement du gaz de recyclage.

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