以水熱法轉化纖維素為具有附加價值化學品之研究

本研究以水熱法將纖維素轉化為具有附加價值之化學品（e.g.葡萄糖、5-羥甲基糠醛(5-HMF)），探討球磨前處理與水熱反應條件（180~240℃，22~24 bar）對纖維素轉化反應產物之產率的影響。研究結果顯示經過球磨處理72小時後，纖維素的結晶度由原先的72%減少為20%。經球磨處理72小時的纖維素在溫度220℃與壓力22 bar條件下反應1小時後的葡萄糖與5-HMF產率可分別由2.9、10.5%提昇至11.5、34.0%；然而隨著反應時間的增長，這兩者的產率皆隨之降低，反應時間至12小時後的葡萄糖與5-HMF產率已分別減少為0.3、4.4%，這顯示最初反應生成的葡萄糖與5-HMF已進一步轉化為其他副產物。本研究結果可作為纖維素水熱轉化製程開發之基礎資料。

關鍵字

纖維素；水熱法；球磨法； 5-羥甲基糠醛；生質能

並列摘要

In this work, the cellulose was converted into value-added chemicals (e.g. glucose, 5-hydroxymethylfurfural (5-HMF)) by the hydrothermal method. The effects of the ball-milling pretreatment and the hydrothermal reaction conditions (180~240℃, 22~24 bar) on the product yields of cellulose conversion were investigated. The results showed that the crystallinity index of raw cellulose (72%) was reduced to 20% after a 72 hr of ball-milling. For 1 hr of reaction time under the hydrothermal condition (220℃, 22 bar), the yields of glucose and 5-HMF of the 72 hr ball-milled cellulose were respectively promoted to 11.5% and 34.0% comparing to those (2.9% and 10.5%) for the raw cellulose. Nevertheless, the yields of both the glucose and 5-HMF were decreased with the prolonged reaction time and were found to 0.3% and 4.4% for the reaction time as long as 12 hr. This indicated that the initial glucose and 5-HMF products were further converted into other side products. These results could be the basic data for the further design of cellulose hydrothermal conversion process.

並列關鍵字

Cellulose ； Hydrothermal method ； Ball-milling ； 5-HMF ； Biomass energy

國際替代計量

以水熱法轉化纖維素為具有附加價值化學品之研究

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