Process for purifying a liquid contaminated by filamentary...

Details Process for purifying a liquid contaminated by filamentary... Process for purifying a liquid contaminated by filamentary...

D - Textiles, Paper

01

F

D01F 13/02 (2006.01) B01D 61/02 (2006.01) C01D 1/28 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2241193

Liquids which are contaminated in a production plant by filamentary molecules with molar masses of at least 10,000 daltons are purified by means of a selective diaphragm separation process before being fed back into the production plant. This concerns, for example, hemicellulose-contaminated caustic soda occurring in the production of cellulose and viscose. In the diaphragm separation process, nanofiltration is performed with a separation limit of under 1,000 daltons.

Des liquides qui ont été pollués dans une installation de production par des molécules filiformes ayant des masses molaires d'au moins 10 000 daltons sont épurés par séparation par membrane, avant d'être renvoyés dans l'installation de production. Ces liquides peuvent par exemple être de la soude caustique polluée par de l'hémicellulose, comme il s'en produit dans le cadre de la préparation de cellulose et de viscose. Ce précédé de séparation par membrane se caractérise en ce qu'une nanofiltration est effectuée avec une limite de séparation inférieure à 1000 daltons.

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