Improved process for recovering hydrogen in producing pure...

Details Improved process for recovering hydrogen in producing pure... Improved process for recovering hydrogen in producing pure...

C - Chemistry, Metallurgy

07

C

C07C 51/487 (2006.01) C07C 51/43 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2291445

A method for recovering and recycling excess hydrogen from process vent streams in the production of highly pure terephthalic acid where the production of the pure terephthalic acid comprises catalytically hydrogenating impure terephthalic acid, which typically contains 4-carboxybenzaldehyde (4-CBA), color bodies and other impurities, in aqueous liquid phase solution at elevated temperature and pressure.

L'invention concerne un procédé permettant de récupérer et de recycler l'excès d'hydrogène provenant de courants de purge lors de la production d'acide téréphtalique très pur. La production de l'acide téréphtalique pur consiste à hydrogéner de manière catalytique l'acide téréphtalique impur, qui comprend normalement 4-carboxybenzaldéhyde (4-CBA), des corps colorés et d'autres impuretés, en solution dans une phase liquide aqueuse à une température et sous une pression élevées.

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