Removal of ammonia and hydrogen cyanide from synthesis gas...

Details Removal of ammonia and hydrogen cyanide from synthesis gas... Removal of ammonia and hydrogen cyanide from synthesis gas...

C - Chemistry, Metallurgy

01

B

C01B 3/58 (2006.01) C01C 1/04 (2006.01) C10K 1/10 (2006.01) C10K 1/34 (2006.01)

Patent

CA 2323079

A process for producing and cleaning a synthesis gas which contains ammonia and hydrogen cyanide catalytically converts most of the cyanide to ammonia which, along with some of the cyanide, is removed from the gas with water to form an aqueous solution of ammonia and cyanide. The hydrocarbon gas feed to the synthesis gas generator is used to strip ammonia and cyanide out of one or more of the aqueous solutions of these two species formed during the process and pass them into the generator in which they are consumed to form clean water. A portion of the resulting clean water is recycled back into the process where it is used to scrub the synthesis gas, with the remainder used for other purposes or sent to disposal.

Ce procédé de production et de nettoyage d'un gaz de synthèse contenant de l'ammoniaque et du cyanure d'hydrogène permet de transformer par voie catalytique la majeure partie du cyanure en ammoniaque alors qu'une partie du cyanure est extraite du gaz avec de l'eau pour former une solution aqueuse d'ammoniaque et de cyanure. On utilise le gaz hydrocarboné amené au générateur de gaz de synthèse pour éliminer l'ammoniaque et le cyanure de l'une des solutions aqueuses, sinon de plusieurs, de ces deux espèces constituées durant le processus et on les fait passer dans le générateur où elles sont employées à donner de l'eau non contaminée. Une partie de l'eau non contaminée obtenue est renvoyée dans le processus où elle sert à épurer le gaz de synthèse, ce qui reste de cette eau étant employé à d'autres fins ou mis au rebut.

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