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printech, September, 2000
Recover Solvent From Air


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From:GaryJGATF (gjonesprinting@aol.com)
Date:Wednesday, September 20, 2000 9:06 AM


Since you have not described the type of printing operation, source of the air (e.g., stack emission or room air, the solvent or solvents, or the concentration of the solvent in the air, it will be difficult to answer your question. In printing, there only two applications of solvent recovery from stack emissions that I am knowledgeable with and one involves emissions from the dryers on heatset web offset presses and the other from publication gravure presses. For heatset web offset presses, cooler/condensor filtration units can be used to recover ink oil. The units are about 90% efficient. For publication rotogravure, carbon adsorption is used to collect toluene. The toluene must be steam stripped and separated from the toluene. These units are more efficient at about 95-99%. Recognize that carbon adsorption is not universally applicable as the solvent must be compatible with the carbon. Another adsorbent used is zeolite, which is more compatible with a wide range of solvents. I hope this provides some insight into your question. If you have more details I might be able to provide some more information. Thank you for contacting PNEAC. Gary Jones Graphic Arts Technical Foundation 200 Deer Run Road Sewickley, PA 15143 412/741-6860 x608 - Phone 412/741-2311 - Fax



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