Potential use of condensate generated by cooling the steam obtained during high-frequency/vacuum drying step of hardwood lumber was investigated. The liquid condensates were obtained from oak, beech and walnut wood. This liquid condensate was then used as a replacement for deionized water in the synthesis of Urea-Formaldehyde (UF) resin (5 wt% of total resin) using a laboratory scale reactor. Medium Density Fibreboards (MDFs) were produced using control and modified resins. Emissions of Volatile Organic Compounds (VOCs) from the MDFs were determined by Mcro Chamber method. The bonding properties of the MDFs were determined according to European standards. The main VOC emissions from MDFs produced using UF resin containing the condensate were a-Pinene, b-Pinene, careen, and acetic acid, which were lower than those of the control MDF, except for the acetic acid emission of MDF with oak condensate. In the tree species, the beech wood condensate gave the lowest VOC emissions (732 μgm^-3) from the MDFs, followed by the MDFs containing walnut wood condensate (852 μg·m³), oak wood condensate (998 ugnf³), and control MDF (3529 μg^-3), respectively. However, the internal bond strength of MDFs containing the condensate was negatively impacted by the condensate (0.70 N·mnf-² to 0.54 N·mm^-2 depending on the tree species). The results showed that the liquid wood-drying condensate which generally released to the ground could be efficiently used as an alternative to expensive VOCs scavenger used in the production of UF resin bonded MDF. This may be one of the most efficient uses of the condensate in high value-added materials.

中文翻译：

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木材干燥冷凝液对挥发性有机化合物排放及纤维板粘结性能的影响

研究了冷却硬木木材在高频/真空干燥步骤中获得的蒸汽所产生的冷凝物的潜在用途。液体冷凝物来自橡木，山毛榉和胡桃木。然后，使用实验室规模的反应器，在液态尿素（UF）树脂（占总树脂的5 wt％）的合成中，将这种液态冷凝物用作去离子水的替代品。中密度纤维板（MDF）使用对照树脂和改性树脂生产。通过Mcro Chamber方法确定MDF中挥发性有机化合物（VOC）的排放。MDF的粘结性能是根据欧洲标准确定的。使用含有冷凝物的UF树脂生产的MDF中的主要VOC排放量为α-P烯，b-ene烯，钙烯和乙酸，均低于对照MDF，除了MDF与橡树冷凝液之间的乙酸排放。在树种中，山毛榉木冷凝物的VOC排放量最低（732μgm^-3）从MDF中，随后含胡桃木冷凝水（852的MDF微克·米³），橡木缩合物（998 ugnf ³），和控制MDF（3529微克^-3），分别。但是，含有冷凝水的MDF的内部结合强度受到冷凝水的负面影响（取决于树种，为0.70 N·mnf- ²至0.54 N·mm ^-2）。结果表明，通常释放到地面的液态木材干燥冷凝物可以有效地替代生产UF树脂粘合MDF时使用的昂贵VOCs清除剂。这可能是高附加值材料中冷凝液最有效的利用之一。