生物质水热液化和炭化产物特性研究(英文)

Characterization of products from hydrothermal liquefaction and carbonation of biomass model compounds and real biomass

分别选取稻杆,水葫芦,纤维素和木聚糖(生物质模型化合物)为原料,在反应釜中进行水热液化(300℃,30 min)和水热炭化(220℃,4 h)实验,对液化产物和炭化产物进行分析。结果表明,稻杆获得重油产率达最大值21.62%。纤维素,木聚糖和水葫芦的重油产率分别为15.00%,11.61%和12.19%。生物质化学组分对其重油产率和组分有着一定的影响。液态产物分别利用总有机碳分析仪(TOC)和气质联用仪(GC-MS)进行测定。表明重质油中主要含有酮类,酚类,醛类,醇类和少量的酸类化合物。利用扫描电镜(SEM)和透射电镜(TEM)对水热炭化固态产物进行了形貌与结构表征,得到具有核壳结构的纳米微球。纤维素,水葫芦和稻杆有着较高的焦炭产率,最后对木聚糖的碳微球形成机理进行初探。

The main properties of products from real biomass （water hyacinth, rice straw ）, and biomass model compounds （microcrystalline cellulose, xylan） by hydrothermal liquefaction （300 ℃ for 30 min） and carbonation （220 ℃ for 4 h ） were examined in a batch reactor. The results showed that rice straw （ RS ） has the highest heavy oil yield of 21. 62% from the hydrothermal liquefaction （HTL）. The oil yields from HTL are 15.00%, ll. 61% and 12. 19% for microcrystalline cellulose （MC）, xylan （XL） and water hyacinth （WH）, respectively. The yields and composition of the heavy oil depend on the chemical ingredients in real biomass. The major compounds of the liquid products from HTL were identified by TOC and GCMS. The heavy oil mainly contains ketones, phenols, aldehydes, alcohols, and a few acids from different materials. The hydrochar, analyzed by SEM and TEM, is composed of carbon microspheres in the form of coreshell during HTC. MC, WH, and RS have higher char yield. Finally, the formation of carbon microspheres of the xylan was proposed.