Cleaning method for membranes

Details Cleaning method for membranes Cleaning method for membranes

B - Operations, Transporting

01

D

B01D 65/02 (2006.01) B01D 61/14 (2006.01) B01D 65/06 (2006.01) C11B 3/00 (2006.01)

Patent

CA 2301319

Oils, extracted from vegetables and animal tissue contain impurities such as waxes, that can be removed by filtration. During filtration the impurities stick to the membranes, which causes a reduction in flux. The initial flux can be reached again by regularly cleaning the membranes by applying the steps of: (a) backblowing with gas, (b) backflushing with edible oil, (c) treating the membranes with alkaline material. The cleaning method is in particular suitable for cleaning microfilters having an average pore diameter of 0.5-5 µm, that are used in an oil refining process.

Des huiles extraites de végétaux et de tissus animaux contiennent des impuretés, telles que des cires, qu'on peut éliminer par filtrage. Lors du filtrage, les impuretés collent à la membrane, ce qui provoque une réduction du flux. On peut retrouver le flux initial en nettoyant régulièrement les membranes, le procédé de nettoyage consistant: (a) à effectuer un décolmatage des membranes avec un gaz (b) à les rincer avec une huile comestible (c) à traiter les membranes avec une matière alcaline. Le procédé de nettoyage est particulièrement indiqué pour le nettoyage de microfiltres possédant un diamètre poreux moyen de 0,5-5 µm et s'utilisant dans un procédé de raffinage d'huile.

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