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printech, November, 2000
Re: wet scrubbing


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From:William Bertele(wbertele@voicenet.com)
Date:Wed, 29 Nov 2000 17:18:09 -0500


I am not aware of any good results using a scrubber for the collection of ethanol nor ethyl acetate, unless you have an unlimited amount of fresh water and the ability to dispose of or use equal amounts of contaminated water. There has been some attemps in the past to use other scrubbing mediums (e.g.. low vapor pressure oils) to collect VOC's but these have not become viable alternatives to other VOC emission control approaches. The primary problem, is that recirculation of VOC laden water soon becomes saturated with VOC's and the collection efficiency approaches zero. There is the option of treating the scrubber water to remove the VOC's, but this is difficult due to the unlimited solubility of ethanol in water, the partial solubility of ethyl acetate in water and the problems of dealing with the azeotropes of both. in, say a distillation column. I also feel that if there were any possible way to collect VOC's with a wet scrubber using water, it would probably require a chemical engineer as the operator. In other words impractical...uneconomical. I have never heard of anyone using a wet scrubber with water on any VOC emitting process including printing & coating. Bill William Bertele, P.E., DEE Environmental Engineer Bertele Environmental New Hope, PA 215-862-3742



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