Deaeration process

Details Deaeration process Deaeration process

C - Chemistry, Metallurgy

12

P

C12P 7/64 (2006.01) C12M 1/00 (2006.01) C12M 1/04 (2006.01)

Patent

CA 2551659

A process for producing an oil, or a polyunsaturated fatty acid (PUFA), is described where an aqueous liquid comprising cells is deaerated, and the oil or PUFA is obtained from the cells. Deaeration can be performed by a wide variety of techniques, including the application of a vacuum (or reduced pressure), mechanical deaeration or degassing by reduced stirring or subjecting the broth to centrifugal forces, reducing viscosity (by dilution or heating), reduction in the supply of oxygen or air during fermentation or a reduction in stirring rate, lowering the pH (to lower the solubility of CO2), filtration using PTFE capillaries, gas displacement (by bubbling in nitrogen or helium) or chemical deaeration (using oxygen scavengers).

L'invention concerne un procédé de production d'une huile ou d'un acide gras polyinsaturé (PUFA), dans lequel un liquide aqueux comprenant des cellules est désaéré, et de l'huile ou un PUFA est obtenu à partir des cellules. La désaération peut être menée à bien selon une grande variété de techniques, dont l'application de vide (ou d'une pression réduite), la désaération mécanique ou le dégazage par agitation réduite ou par exposition du bouillon à des forces centrifuges, réduction de la viscosité (par dilution ou chauffage), réduction de l'alimentation en oxygène ou en air pendant la fermentation ou réduction de la vitesse d'agitation, abaissement du pH (pour réduire la solubilité du CO¿2?), filtration par capillaires PTFE, déplacement de gaz (par barbotage d'azote ou d'hélium) ou désaération chimique (au moyen de désoxygénants).

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