An integrated platform for furfural production and separation from xylans using an acidic aqueous biphasic system (AcABS) is described here. The AcABS is composed of the ionic liquid (IL) tributyltetradecylphosphonium chloride ([P_444(14)]Cl) and hydrochloric acid (HCl), the latter acting both as a catalyst and phase-forming agent. Furfural is produced in the AcABS biphasic regime under microwave irradiation, being continuously extracted to the IL-rich phase. Operating conditions (reaction time, temperature, HCl and IL wt %, and solid/liquid ratio) were initially screened to identify the most relevant parameters affecting furfural production, being optimized using a response surface methodology approach. A maximum furfural yield of 78.8% and an extraction efficiency to the IL-rich phase of 85.5% were attained in 1 min in the microwave reactor, at 140 °C and 0.05 S/L ratio, with the ABS formed by 30 wt % IL and 6.5 wt % HCl. Three reaction cycles were performed by reusing the IL, in which 78.0% of furfural could be recovered from the IL-rich phase in all the reaction cycles, without compromising the furfural yield and extraction efficiency. This work demonstrates the potential of acidic-based aqueous biphasic systems as one-step production–separation strategies of high-value platform chemicals, paving the way toward sustainable development within biorefineries.

中文翻译：

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使用基于酸性的双相系统集成生产和分离糠醛

此处描述了使用酸性水性双相系统 (AcABS) 生产和分离木聚糖的糠醛集成平台。AcABS 由离子液体 (IL) 三丁基_十四烷基氯化鏻 ([P _444(14)]Cl) 和盐酸 (HCl)，后者既充当催化剂又充当相形成剂。糠醛在微波辐射下在 AcABS 双相体系中产生，并被连续提取到富含 IL 的相。最初筛选操作条件（反应时间、温度、HCl 和 IL 重量百分比以及固/液比）以确定影响糠醛生产的最相关参数，并使用响应面方法进行优化。在微波反应器中，在 140 °C 和 0.05 S/L 比下，1 分钟内实现了 78.8% 的最大糠醛产率和 85.5% 的富含 IL 相的提取效率，ABS 由 30 wt% IL 形成和 6.5 重量% HCl。通过重复使用IL进行三个反应循环，其中在所有反应循环中可以从富IL相中回收78.0%的糠醛，在不影响糠醛产率和提取效率的情况下。这项工作证明了基于酸性的水性双相系统作为高价值平台化学品的一步生产分离策略的潜力，为生物精炼厂的可持续发展铺平了道路。