Patent ID: 6491888
Filing Date: 2002-12-10
Classification: C07C,C10G

Abstract:
A process for the pH control of a silver nitrate solution used for the selective recovery of olefins from a mixture of gases, said process comprising:a) bringing a gaseous mixture comprising olefins and hydrogen into contact with an aqueous silver nitrate solution, whereby the olefins are absorbed into the silver nitrate solution as a complex; b) separating the solution comprising the complexed olefins from the non-absorbed gases; c) de-pressurising and heating the olefin complex solution from (b) so as to release the olefins from the complex and regenerate the silver nitrate solution; d) passing said regenerated silver nitrate solution through a bed comprising silver oxide so as to maintain the pH value of the silver nitrate between 3 and 6; and e) recycling the silver nitrate solution regenerated in (d) to step (a).