Improved recovery of energy during the production of...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/265 (2006.01) B01D 3/00 (2006.01) B01D 3/14 (2006.01) C07C 63/00 (2006.01) C07C 63/15 (2006.01)

Patent

CA 2599981

Energy is recovered during the production of aromatic carboxylic acids by liquid phase oxidation of aromatic hydrocarbons by performing a high efficiency separation on the reactor overhead vapor to form a high pressure gaseous overhead stream comprising water and organic impurities; recovering heat energy from the high pressure gaseous overhead stream by exchanging heat with a suitable heat sink material such that a condensate comprising from about 20 wt% to about 60 wt% of the water present in the high pressure gaseous overhead stream is formed and a high pressure off-gas is formed; and recovering energy in the form of work from the high pressure off-gas. Preferably such work is recovered using isentropic means for energy recovery, for example an expander. Apparatus for such process is also provided.

Selon l'invention, lors de la production d'acides carboxyliques aromatiques par oxydation en phase liquide d'hydrocarbures aromatiques, l'énergie est récupérée par l'intermédiaire d'une séparation à haut rendement au niveau de la vapeur de tête du réacteur pour former un flux gazeux de tête à haute pression comprenant de l'eau et des impuretés organiques ; l'énergie thermique est récupérée à partir de ce flux gazeux de tête à haute pression par échange de chaleur avec un matériau de dissipation thermique adapté de façon à former un condensat comprenant entre 20 % en poids approximativement et 60 % en poids approximativement de l'eau présente dans le flux gazeux de tête à haute pression et un gaz résiduel à haute pression ; de l'énergie est récupérée sous forme de travail à partir dudit gaz résiduel à haute pression. Ce travail est récupéré de préférence à l'aide de moyens isentropiques pour la récupération d'énergie, tels qu'un détendeur. L'invention concerne également un appareil permettant de mettre en oeuvre un tel procédé.

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