Methanol purification method and apparatus

Details Methanol purification method and apparatus Methanol purification method and apparatus

B - Operations, Transporting

01

D

B01D 53/72 (2006.01) B01D 3/00 (2006.01) B01D 5/00 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2751602

The invention relates to a method and apparatus to recover and purify methanol from gases pro-duced in the digester during the kraft pulping process. The gas is typically recovered as a foul gas (called stripper off gas or SOG) comprising methanol, water and various other contaminants. The gas is then treated with successive decanting and distillation steps to re-move impurities, thereby producing highly purified methanol.

L'invention porte sur un procédé et un appareil pour récupérer et purifier du méthanol à partir de gaz produits dans le lessiveur pendant le procédé de fabrication de pâtes kraft. Le gaz est typiquement récupéré sous forme d'un gaz non condensable (appelé effluent gazeux de rectificateur ou SOG) comprenant du méthanol, de l'eau et divers autres contaminants. Le gaz est ensuite traité par des étapes de décantation et de distillation successives pour enlever les impuretés, ce qui produit de cette manière du méthanol hautement purifié.

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