林产化学与工业
林產化學與工業
림산화학여공업
CHEMISTRY AND INDUSTRY OF FOREST PRODUCTS
2015年
3期
60-66
,共7页
亚临界水%木质素%解聚%酚类化合物%水热焦
亞臨界水%木質素%解聚%酚類化閤物%水熱焦
아림계수%목질소%해취%분류화합물%수열초
subcritical water%lignin%depolymerization%phenols%hydrochar
利用间歇式高压反应釜在250~350℃的亚临界水中进行杉木碱木质素的水热解聚反应。通过GC/MS的定性、定量分析以及元素分析和FT-IR,分析反应液相和固相产物的组成与结构变化,探究了不同温度下碱木质素水热解聚的反应特性。结果表明,碱木质素水热解聚反应残渣率在325℃时最低,为18.66%。碱木质素在亚临界水中解聚所得的液相产物中酚类化合物GC含量均在80%以上,且随反应温度的升高,酚类化合物种类增加,总酚含量提高。酚类产物中愈创木酚的含量最高,其质量分数在325℃时达最高17.71 mg/g。随着反应温度升高,在一定程度上木质素脱氢脱氧,含碳量增加。在325℃时碳基转化率和能量转化率均最高,分别为79.18%和79.95%。在温度低于325℃时,水热焦的化学结构与木质素相似,达到350℃时,木质素严重缩合炭化。
利用間歇式高壓反應釜在250~350℃的亞臨界水中進行杉木堿木質素的水熱解聚反應。通過GC/MS的定性、定量分析以及元素分析和FT-IR,分析反應液相和固相產物的組成與結構變化,探究瞭不同溫度下堿木質素水熱解聚的反應特性。結果錶明,堿木質素水熱解聚反應殘渣率在325℃時最低,為18.66%。堿木質素在亞臨界水中解聚所得的液相產物中酚類化閤物GC含量均在80%以上,且隨反應溫度的升高,酚類化閤物種類增加,總酚含量提高。酚類產物中愈創木酚的含量最高,其質量分數在325℃時達最高17.71 mg/g。隨著反應溫度升高,在一定程度上木質素脫氫脫氧,含碳量增加。在325℃時碳基轉化率和能量轉化率均最高,分彆為79.18%和79.95%。在溫度低于325℃時,水熱焦的化學結構與木質素相似,達到350℃時,木質素嚴重縮閤炭化。
이용간헐식고압반응부재250~350℃적아림계수중진행삼목감목질소적수열해취반응。통과GC/MS적정성、정량분석이급원소분석화FT-IR,분석반응액상화고상산물적조성여결구변화,탐구료불동온도하감목질소수열해취적반응특성。결과표명,감목질소수열해취반응잔사솔재325℃시최저,위18.66%。감목질소재아림계수중해취소득적액상산물중분류화합물GC함량균재80%이상,차수반응온도적승고,분류화합물충류증가,총분함량제고。분류산물중유창목분적함량최고,기질량분수재325℃시체최고17.71 mg/g。수착반응온도승고,재일정정도상목질소탈경탈양,함탄량증가。재325℃시탄기전화솔화능량전화솔균최고,분별위79.18%화79.95%。재온도저우325℃시,수열초적화학결구여목질소상사,체도350℃시,목질소엄중축합탄화。
Hydrothermal depolymerization of Cunninghamialanceolata alkali lignin were conducted in a batch autoclave at temperatures of 250-350 ℃. The components and characteristics of hydrothermal degraded liquid products and hydrochar were investigated by gas chromatography with mass spectrometry ( GC/MS ) , elemental analyzer and Fourier transforms infrared spectroscopy (FT-IR). The results showed that the least residue (18. 66 %) was collected at 325 ℃. In addition,the relative content of phenols in liquid products was above 80 %,and the types and contents of phenols were both increased with the rise of temperature. Guaiacol was the dominant phenol component, represented 17. 71 mg/g at 325 ℃. With the increase of reaction temperature, reductions of hydrogen and oxygen contents were observed,while the carbon content increased. The optimum carbon and energy conversion rates at 325℃were 79. 18% and 79. 95%,respectively. The chemical structures of hydrochars were similar to alkali lignin at temperatures below 325 ℃. However,a serious carbonization of lignin was observed when the temperature was over 350℃.
