printech, October, 2003
Re: Blanket Wash/Water Separator


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From:Gary Jones( gjonesprinting@aol.com)
Date: Wed, 8 Oct 2003 11:47:12


I am not aware of any "off the shelf" systems that have been designed specifically for the blanket wash/water mixture. However, this does not mean that a system could not be devised. There are several technologies that come to mind immediately and they include an oil/water separator, distillation, and membrane filtration.

The specific choice of technology and its chance for success will be dictated in part by the affinity that the water has for the solvent. There are limitations to each of the technologies as it applies to the separation of water and organics. The oil/water separators work best when a biphased or two layered solution can be created. Distillation works on the differences in physical differences such as boiling points between components in a mixture, but the wild card is how easily the water can be separated from the organics as some organics will form an emulsion with water or actually be miscible with water. In this case, it can be difficult to separate all of the organics from water as azeotrops will form, which means that the water and organic are acting as one material. Lastly, the membrane filtration approach works more on the size of the molecule and to some extent its polarity. If there is enough of a a difference in the sizes and polarity, then the materials can be separated. Gary Jones



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