低温脱着溶剤回収法の開発

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  • Development of the low-temperature desorption solvent recovery process.
  • テイオン ダッチャク ヨウザイ カイシュウホウ ノ カイハツ

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In solvent recovery by activated carbon adsorption, a serious degradation of adsorption capacity of the activated carbon often occurs, especially when ketones, such as cyclohexanone, are contained in the solvents. This is due to the alteration reactions of solvents adsorbed on the activated carbon, such as oxidation, decomposition and polymerization.<BR>Ordinary solvent recovery processes include an adsorption step at normal temperature and a desorption step at 100 °C, using heat from atmospheric-pressure steam. The authors found by fundamental experiments that decreasing the temperature in the desorption step, for instance to 80°C, is very effective in preventing degradation of the activated carbon, and have developed an improved solvent recovery process utilizing a low-temperature (about 80°C) and reduced-pressure (about 47 kPa) steam desorption step. It is called the “Low-Temperature Desorption Solvent Recovery Process”.<BR>A long-run experiment has been carried out for 142 days in a pilot apparatus based on this process in an existing conventional plant, to show that a very long life of activated carbon, i.e. 35 times longer than that in an ordinary process, is attainable.A cmomercial plant based on this process has been in operation since February, 1988.

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