Quantitative Analysis of Pyrolysis Products of Wood Material I. Pyrolysis of Japanese red pine wood meal by a tube-type kiln

摘要

Japanese Red Pine (Pinus densiflora) wood meal was subjected to pyrolysis by the use of a tubetype kiln at 350 or 600 degrees C. Pyrolysates were separated into pyrolysis residue, condensates (liquid phase pyrolysates) which included those obtained by cooling gas phase pyrolysates to -4 degrees C, and the remainder (gas phase pyrolysates). The weight yield of condensates varied from 30 to 50%, and that of pyrolysis residue from 20 to 50% depending on the pyrolysis temperature. In the condensates, 18 identified compounds could be identified by GC-MS (Gas Chromatography-Mass Spectrometry), and each compound was determined by GC. Detailed evaluation was made for the pyrolysis conducted by raising the temperature to 600 degrees C. The 18 identified compounds accounted for only about 10% of the condensates. Determination of water in the condensates by H-1-NMR suggested that 60% of the condensates was water and, thus, 40% was organic substances. Therefore, the 18 identified compounds accounted for 25% of the organic compounds in the condensates. Yield of each fraction was also evaluated based on the carbon content. Organic carbon in the pyrolysis residue and the condensates accounted for 60% and 20%, respectively, of the carbon originally present in the wood meal. Therefore, the remaining 20% was produced as gas. The carbon of the 18 identified compounds accounted for 8% of the carbon of the wood meal, and 40% of the condensate.