Membrane process for producing carbon dioxide

B - Operations – Transporting – 01 – D

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B01D 53/22 (2006.01) C01B 31/20 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2333523

A process for producing carbon dioxide from a gas stream containing same pretreats the incoming raw gas to remove contaminants and particularly to protect degradation of the membranes utilized for separation. The temperatures of the various gas streams are carefully controlled to reduce water from the stream. By-product and other gas streams of the process are recycled in order to increase efficiency by utilizing the heating or cooling properties of the streams. In addition, streams containing minor portions of carbon dioxide are returned to the system for recovery.

Cette invention se rapporte à un procédé servant à produire du dioxyde de carbone à partir d'un flux de gaz contenant un tel dioxyde, et qui traite au préalable le gaz brut arrivant pour en éliminer les contaminants et plus particulièrement pour protéger la dégradation des membranes utilisées pour la séparation. Les températures de divers flux de gaz sont régulées avec soin pour réduire l'eau contenue dans le flux. Les sous-produits et les autres flux de gaz du procédé sont recyclés, en vue d'augmenter l'efficacité, grâce à l'utilisation des propriétés chauffantes ou refroidissantes des flux de gaz. En outre, les flux contenant des petites parties de dioxyde de carbone sont renvoyés dans le système pour être récupérés.

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