Carbon dioxide and hydrogen production method from synthesis...

B - Operations – Transporting – 01 – D

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B01D 53/047 (2006.01) C01B 3/56 (2006.01) C01B 31/20 (2006.01) F25J 3/02 (2006.01)

Patent

CA 2647909

A method of producing a carbon dioxide product stream (756) from a synthesis gas stream (18) formed within a hydrogen plant (1) having a synthesis gas reactor (10), a water-gas shift reactor (14), located downstream of the synthesis gas reactor to form the synthesis gas stream (18) and a hydrogen pressure swing adsorption unit (20) to produce a hydrogen product (22) recovered from the synthesis gas stream. In accordance with the invention, the carbon dioxide is separated from the synthesis gas stream in a vacuum pressure swing adsorption system (80) to produce a hydrogen-rich gas stream (76) and a crude carbon dioxide stream (82) and then purifying the crude carbon dioxide stream by a sub- ambient temperature distillation process thereby to produce the carbon dioxide product (756). A hydrogen synthesis gas feed stream (78) to the hydrogen pressure swing adsorption unit is formed at least in part from the hydrogen- rich stream.

Procédé de production de flux de dioxyde de carbone (756) à partir de flux de gaz de synthèse (18) établi dans une installation de production d'hydrogène (1) à réacteur de gaz de synthèse (10), unité de conversion du CO (14), en aval du réacteur de gaz de synthèse pour la formation du flux de gaz de synthèse (18), et unité d'adsorption d'hydrogène modulée en pression (20) pour la production d'hydrogène (22) récupéré à partir du flux de gaz de synthèse. Selon l'invention, le dioxyde de carbone est séparé du flux de gaz de synthèse dans un système d'adsoprtion modulé en pression sous vide (80) pour la production de flux de gaz riche en hydrogène (76) et de flux de dioxyde de carbone brut (82), avec purification ultérieure de ce flux (82) par distillation à température sub-ambiante, ce qui donne le dioxyde de carbone (756). Un flux de charge d'hydrogène de synthèse (78) destiné à l'unité d'adsorption d'hydrogène modulée en pression est établi au moins en partie à partir du flux riche en hydrogène.

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