Cleaning process where cleaning agent comprises organic...

B - Operations – Transporting – 08 – B

Patent

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B08B 3/08 (2006.01) C11D 7/50 (2006.01) H05K 3/26 (2006.01)

Patent

CA 2212740

In a cleaning process one or more articles are contacted with a cleaning agent containing, based on the total weight of a) and b), a) from 0.01 to 80 weight percent of water and b) from 99.99 to 20 weight percent of an organic solvent having the features of: i) forming an azeotrope with water, and ii) forming a separate phase after azeotropic distillation. Then the cleaned articles are rinsed with a rinsing agent containing from 99.99 to 60 weight percent of water and from 0.01 to 40 weight percent of said organic solvent, based on the total weight of the rinsing agent, whereby the water content in the rinsing agent is higher than the water content in the cleaning agent. Used cleaning and rinsing agent are combined and subjected to an azeotropic distillation. The azeotrope is separated into a water-rich phase and a solvent-rich phase and recycled.

L'invention concerne un procédé de nettoyage selon lequel un ou plusieurs articles sont mis en contact avec un produit nettoyant contenant, sur la base du poids total de a) et de b), a) de 0,01 à 80 % en poids d'eau et b) de 99,99 à 20 % en poids d'un solvant organique ayant pour caractéristiques: i) de former avec l'eau un azéotrope, et ii) de former une phase séparée après distillation azéotrope. Les articles nettoyés sont ensuite rincés avec un produit de rinçage contenant de 99,99 à 60 % en poids d'eau et de 0,01 à 40 % en poids dudit solvant organique, ces quantités étant établies par rapport au poids total du produit de rinçage, la teneur en eau du produit de rinçage étant supérieure à celle du produit nettoyant. On combine le produit nettoyant et le produit de rinçage usés pour les soumettre à une distillation azéotrope. L'azéotrope est séparé en une phase riche en eau et en une phase riche en solvant pour être ensuite recyclé.

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