| The aim and main component of this article is thresholds: Firstly it investigates the Pinus massoniana's essential oil and the component and amount of aldehydes and terpenes compounds emitted from green, air-dried and kiln-dried wood at normal temperature. The article most emphases on component and amount of the VOC emitted from drying wood of Pinus massoniana lumber in a pilot-scale kiln and its disciplinarian and influence factor. The meaning of this study is firstly invesgated the component and amount of the VOC emitted from drying wood of Pinus massoniana lumber in a pilot-scale kil. It has clear and actually meaning on the aspect of controlling the influence to the environment by VOC emission from wood drying.The conclusion is as following: 1. The essential oil gain of the Pinus massoniana is 0.04% by steaming distillation method. 16 compounds are identified; 2. Helium gas of high purity was ventilated to wood particle of air-dried, kiln-dried and green Pinus massoniana wood that was placed in a vessel. Aldehydes and terpenes were collected at normal temperature. The results indicate that: aldehydes such as formaldehyde and terpenes such as β-Mycrene could be emitted from Pinus massoniana at normal temperature; The VOC emission from green wood is much more than the air-dried and kiln-dried wood. The quantity of emission increased obviously from 20℃ to 40℃; The amount of VOC emission is so little that it would not do harm to human's health.3. During Pinus massoniana wood drying at a pilot-kiln, aldehydes, acetic and terpenes analyzed were trapped and analyzed. The results indicate that: There are a large amount of VOC emitted during wood drying process such as aldehydes, terpenens, methanol, formic acid and acetic acid; The total VOC emission when the dry-bulb temperature is 120℃ is much higher than the 95℃; The VOC concentration of the drying exhaust air is high to some extent, so it will make some adverse infects on the environment.[Fig.34,Tab. 16,Ref.56]...
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