Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.
Environ Res. 2020 May;184:109340. doi: 10.1016/j.envres.2020.109340. Epub 2020 Mar 6.
5-Hydroxymethylfurfural (HMF) as value-added platform chemical can be derived from biomass. This study used microwave hydrothermal liquefaction (MHTL) to obtain HMF from sugarcane bagasse in acidic seawater conditions. The key processing parameters including temperature, reaction time, and liquid-to-solid ratio (L/S) were evaluated and optimized. The highest HMF yield of 8.1 wt% was obtained at 149 °C with a reaction time of 4 min and a L/S value of 12:1, respectively. This yield is considerable and even higher than the yield derived from sugarcane molasses under similar microwave conditions in the absence of seawater. Hence, acidic seawater was found to promote the hydrolysis of sugarcane bagasse to give HMF precursor (i.e. fructose and glucose), while simultaneously inhibiting the conversion of HMF to levulinic acid under MHTL conditions, possibly explaining the high HMF yield. This method presents a new and sustainable means of transforming waste biomass to valuable substances using seawater or brine wastewater.
5-羟甲基糠醛（HMF）作为一种有附加值的平台化学品，可以从生物质中提取。本研究采用微波水热液化（MHTL）技术，在酸性海水条件下从甘蔗渣中提取 HMF。评估和优化了关键的工艺参数，包括温度、反应时间和液固比（L/S）。在 149°C 的温度下，反应时间为 4 分钟，L/S 值为 12:1 时，HMF 的最高收率为 8.1wt%。与在没有海水的情况下，在相似的微波条件下从甘蔗废糖蜜中提取 HMF 的收率相比，这一收率相当可观，甚至更高。因此，酸性海水被发现可以促进甘蔗渣水解生成 HMF 前体（即果糖和葡萄糖），同时在 MHTL 条件下抑制 HMF 向乙酰丙酸的转化，这可能解释了高 HMF 收率的原因。该方法为利用海水或卤水废水将废物生物质转化为有价值的物质提供了一种新的可持续方法。
