| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of preventing the contamination by exhaust air/waste water in a vacuum drying device, capable of minimizing the contamination of living environment caused by matters discharged from the device while minimizing the equipment cost and the operation cost. <P>SOLUTION: An alkaline mixing means is attached to a vacuum drying tank for mixing a specific amount of an alkaline additive agent coexisiting with an acid substance easily scattered in a processed material to modify the same into the hardly evaporatable property, into the processed material. An alkaline substance neutralizing means is mounted in an air discharge passage connected to a discharge port of the vacuum drying tank, for neutralizing and capturing a gaseous alkaline component generated from the processed material. Preferably, pH of the processed material is adjusted approximately 10. A temperature in the air discharge passage may be controlled to prevent the dilution of involatile acid solution as the alkaline substance neutralizing means, by water vapor. <P>COPYRIGHT: (C)2004,JPO</p> |
