Effect of KOH Extraction on Micro/Nano Particles of Wood Extractives and Hemicellulose Leaching from Chinese-fir Wood

In order to overcome the above-mentioned negative effects, the fresh Chinese-fir shavings were extracted in KOH soultion, were analyzed by ZETA and SIZER to find out the leaching rule of nano particles in Chinese-fir wood. The results are as follows: (1) The extraction mass arrived at the maximum value when KOH concentration is about 17.5%. The micro/nano particles in Chinese-fir shavings would be discharged sufficiently in the KOH solution with the increaing of extracting time.(2) The diameter the micro/nano particles of wood extractives and hemicellulose is comparatively scattered according to volume fraction. Micro/nano particles in the diameter of 91.3-342 nm, 91.3-342 nm, 342-1720 nm is the most at the extracting time of 3 h, 16 h, 24 h, respectively (3)The diameter the micro/nano particles of wood extractives and hemicellulose is chiefly between 342 nm and 6440 nm according to number fraction.Micro/nano particles in the diameter of 91.3-342 nm, 91.3-342 nm, 91.3-342 nm is the most at the extracting time of 3 h, 16 h, 24 h, respectively.