Rapid-cooling, continuous-feed pyrolyzer for biomass processing: Preparation of levoglucosan from cellulose and starch
✍ Scribed by Gu-Joong Kwon; Dae-Young Kim; Satoshi Kimura; Shigenori Kuga
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 261 KB
- Volume
- 80
- Category
- Article
- ISSN
- 0165-2370
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✦ Synopsis
Novel design of pyrolyzer was developed for efficient collection of primary degradation products from biomass. The apparatus consists of a pair of horizontal belt conveyers facing to each other, in a reduced-pressure chamber with pressures ranging from 600 Pa to 8 kPa. The lower belt feeds the powder of raw material to the pyrolysis region heated up to 450 8C; the upper belt facing the heated part is cooled from the top to condense the evaporated products with minimal secondary degradation. A continuous-feed pyrolyzer for the production of organic liquids from cellulosic biomass has been demonstrated at a laboratory-scale of 5-10 g/h of dry feed in temperature of 410-450 8C. Treatment of cellulose and starch gave high yields of 1,6-anhydro-b-D-glucopyranoside (levoglucosan). The yield depended on the heater temperature and the residual air pressure in the chamber. The maximum yield of levoglucosan from microcrystalline cellulose (Avicel) was approx. 70% (analytical value) under residual air of 5 kPa.