Levulinic acid (LA) is an important biomass-based chemical. The preparation of LA from bagasse is of great practical significance for the comprehensive and efficient utilization of biomass. Biomass bagasse is mainly composed of cellulose, hemicellulose, and lignin. The cellulose is mainly degraded to glucose, and hemicellulose is mainly degraded to xylose, with dilute acid treatment at high temperature. In this research, we produced the LA from bagasse with dilute acid treatment at high temperature. The influences of residence time (10–60 min), reaction temperature (170–240 °C), liquid-to-solid ratio (5:1–25:1 mL/g), and acid concentration (1–5%) on the synthesis of LA were investigated by statistical methods, achieving a maximum LA yield of 16.25%. Additionally, LA was isolated and extracted from bagasses hydrolysate by ion exchange and vacuum distillation. The adsorption capacity of different resins was determined and compared. The optimal resin to acquire better adsorption capacity was determined. The better adsorption capacity was obtained when the D301 resin was selected as the filter for ion exchange. The height-to-diameter rate, eluent flow rate, elution volume of ion exchange column were 10, 0.84 BV/h, 56.4 mL, respectively. The eluent was then distilled under vacuum, collecting the components at 130–140 °C. The total yield and purity of LA were 67.1% and 78%, respectively.

中文翻译：

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蔗渣中提取的乙酰丙酸的优化纯化

乙酰丙酸（LA）是一种重要的基于生物质的化学品。从蔗渣中制备LA对生物质的综合利用具有重要的现实意义。生物质蔗渣主要由纤维素，半纤维素和木质素组成。在高温下进行稀酸处理后，纤维素主要降解为葡萄糖，半纤维素主要降解为木糖。在这项研究中，我们用甘蔗渣经高温稀酸处理制成了LA。停留时间（10–60分钟），反应温度（170–240°C），液固比（5：1–25：1 mL / g）和酸浓度（1–5％）的影响通过统计方法研究了LA的合成，获得最大的LA收率为16.25％。另外，分离出LA，并通过离子交换和真空蒸馏从蔗渣水解产物中提取LA。测定并比较了不同树脂的吸附能力。确定了获得更好吸附能力的最佳树脂。当D301树脂被选定为过滤器的离子交换而获得更好的吸附能力。离子交换柱的高径比，洗脱液流速，洗脱体积分别为10、0.84 BV / h，56.4 mL。然后在真空下蒸馏洗脱液，在130–140°C下收集组分。LA的总产率和纯度分别为67.1％和78％。当D301树脂被选定为过滤器的离子交换而获得更好的吸附能力。离子交换柱的高径比，洗脱液流速，洗脱体积分别为10、0.84 BV / h，56.4 mL。然后将洗脱液在真空下蒸馏，在130–140°C的温度下收集组分。LA的总产率和纯度分别为67.1％和78％。当D301树脂被选定为过滤器的离子交换而获得更好的吸附能力。离子交换柱的高径比，洗脱液流速，洗脱体积分别为10、0.84 BV / h，56.4 mL。然后将洗脱液在真空下蒸馏，在130–140°C的温度下收集组分。LA的总产率和纯度分别为67.1％和78％。