| 摘要 |
<p>PURPOSE:To obtain recovered solvent of high quality without requiring a large- scale ancillary facility, such as neutralizing and purifying equipment, to decrease the maintenance cost required for the recovery of organic solvent gas and to prevent the formation of secondary impurities due to the neutralization treatment of the recovered solvent. CONSTITUTION:When raw gas contg. organic solvent gas 102 is fed to an adsorber 16 provided with active carbon 16a, an amine base organic solvent is added to the organic solvent gas. Since the amine base organic solvent is a weak base, it acts as a stabilizer for organic solvent. In such a way, the organic solvent is decomposed by catalytic action of desorption gas 104 and the active carbon 16b to form impurities, such as organic acid, inorganic acid and peroxide is suppressed to a minimum. Further, since the desorption gas 104 fed to the adsorber 14 carries the amine base organic solvent, it becomes alkaline, the desorption of the organic solvent from the active carbon 16b is promoted. The amine base organic solvent is not saponified with the organic solvent and secondary impurities are not formed.</p> |
