ENVR 148 |
| One of today's ecological problems is contamination by the vapor of organic solvents in the process of fixing and drying varnish paints. Formed gas-air mixtures become dangerously prone to fire and explosion, as well being toxic. Leaving aggressive organic solvents out in the atmosphere results in deterioration of sanitary-hygenic conditions as well as in irretrievable loss of expensive synthetic material. The film-forming nonvolatile material in varnish paint forms not more than 25% of the whole varnish-paint material. Thereby, about 75% forms the mixture of such solvents as toluene, xylene, acetone, butyl acetate and other substances. After fixing paints on the painted surface under comparatively low temperatures the solvents are irretrievably vaporized in the surroundings. There is a large number of devices for removing the forming vapor of the solvents from the zone of drying and for reducing their toxicity, but the question of catching and their repeated use is not solved yet. In connection with that, the processes of painting and drying are realized basically in special equipped areas; there is a possibility for catching them. For this purpose under forced exhaustion of forming vapor of the solvents from drying zone we use a heat exchanger that is water cooled. The vapor of the solvents are condensed in a special tank in passing through a cooling refrigerator and accumulated, which could be used a second time after appropriate processing. Researches are carried out on finding the optimum conditions of the work and construction of device. Thereby, there is a real possibility for solving the current ecological problem and the improvement of painting work technologies. |
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General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Environmental Chemistry |