Optimization of thermal desorption conditions for recovering wood preservative from used railroad ties through response surface methodology

JOURNAL OF CLEANER PRODUCTION

卷:201

Article

Kim, Pyoungchung¹  Haber, Holly L.^2,3  Lloyd, Jeff⁴  Kim, Jae-Woo⁴  Abdoulmoumine, Nourredine³  Labbe, Nicole² 

[1] TerraPower LLC, 330 120th Ave NE,Suite 100, Bellevue, WA 98005 USA

[2] Univ Tennessee, Ctr Renewable Carbon, 2506 Jacob Dr, Knoxville, TN 37996 USA

[3] Univ Tennessee, Biosyst Engn & Soil Sci, 2506 EJ Chapman Dr, Knoxville, TN 37996 USA

[4] Nisus Corp, 100 Nisus Dr, Rockford, TN 37853 USA

关键词: Bio-oil;    Naphthenic acids;    Pyrolysis;    Response surface methodology;    Used railroad ties;   

DOI  :  10.1016/j.jclepro.2018.08.097

来源: Elsevier

【 摘 要 】

A statistical response surface methodology (RSM) using a central composite design (CCD) model was applied to identify the optimum thermal desorption conditions for maximum recovery of preservative from copper naphthenate (CuNap) treated wood and subsequent production of a high quality pyrolytic vapor from the thermally treated wood. From the designed experiment, 94% of the total preservative present in the ties was desorbed at temperatures higher than 250 degrees C and residence times longer than 30 min. Elevating the temperature from 215 degrees C to 285 degrees C for 45 min residence time generated a weight loss of 12-36 wt%, an increase in higher heating value (HHV) from 20.1 to 21.9 MJ/kg, and a reduction of energy yield from 90.4 to 71.5% of the resulting thermally treated biomass. Pyrolysis at 450 degrees C of this material produced a vapor rich in sugars- and lignin-derived compounds. The predicted optimum conditions in terms of a maximum preservative recovery, minimum energy yield loss of the wood, and production of thermally treated biomass that generates a high proportion of sugars- and lignin-derived compounds during pyrolysis were found to be 265 degrees C and 51 min. Under these optimum conditions, the predicted maximum preservative recovery was 95% while the predicted thermally treated solid retained 77% of the original energy yield and produced high portions of levoglucosan and lignin-derived compounds during subsequent pyrolysis, similar to torrefied wood. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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