咖啡渣（SCG）和米糠（RB）分別是在沖泡咖啡豆和碾磨水稻後的殘留物。這些殘留物含有相當量的脂質（〜16％w / w）。為使SCG和RB具有經濟價值，將這些殘留物進行酸水解，以生產含糖的水解產物和富含脂質的水解後殘留物（PHR）。水解後的廢咖啡渣（PHSCG）和米糠（PHRB）仍然保有最初有用的脂質，其脂質的含量分別可高達〜26％w / w和〜48％w / w的脂質。有別於使用來自纖維素的富含糖的水解產物進行發酵，含高脂質的PHRs尚未經廣泛的探討及利用。因此需要收集脂質萃取的動力學和平衡數據，以進行程序和設備設計。本研究以正己烷為溶劑探討溶劑與固體的比例（4至12 mL / g）和溫度（30至60°C）對從PHSCG和PHRB中萃取脂質的動力學和平衡的影響。為描述脂質萃取系統，本研究使用各種動力學模型來擬和實驗數據，其中多階段模型最能代表萃取過程（R2≥0.99）。無論萃取溫度和SSR如何，都可以在很短的萃取時間（<10分鐘）內達到洗滌平衡，並且可以在30至60分鐘內萃取超過90％的脂質。可用較少溶劑從PHSCG和RB中萃取相同量的脂質；從SCG萃取脂質所需的溶劑最多可節省40％。此外，發現水解後殘餘物中的可得到脂質的適合作為生質柴油的原料。

Spent coffee grounds (SCG) and rice bran (RB) are agro-industrial residues produced after brewing of coffee beans and milling of paddy rice, respectively. These residues contain appreciable amounts of lipids (~16 %w/w). One way of valorizing SCG and RB is to subject these residues to dilute acid hydrolysis for the production of sugar-rich hydrolysate and lipid-dense post-hydrolysis residues (PHRs). The post-hydrolysis spent coffee grounds (PHSCG) and rice bran (PHRB) retains the initially available lipids, resulting in lipid dense residues containing lipids of up to ~26 %w/w and ~48 %w/w, respectively. Unlike the use of sugar-rich hydrolysates from these lignocellulosic biomass for fermentation, lipid-dense PHRs have not been extensively explored and further utilized. This makes it necessary to gather lipid extraction kinetics and equilibrium data for process and equipment design. The effects of solvent-to-solid ratio (4 to 12 mL/g) and temperature (30 to 60 °C) on the kinetics and equilibrium of lipid extraction from PHSCG and PHRB using n-hexane as solvent were investigated. To appropriately describe the lipid extraction system, various kinetic models were fitted, with multi-step models best representing the extraction process (R2 ≥ 0.99). Regardless of extraction temperature and SSR, washing step equilibrium was reached at a very short extraction time (<10 minutes) and over 90 % of the lipids can be extracted within 30 to 60 minutes. Extraction of lipids from PHSCG and RB required less amount of solvent to extract and recover the same amount of lipids present in SCG and RB, saving up to 40 % of the solvent required for lipid extraction from SCG. Further, the lipid profile of the available lipids in the post hydrolysis residues were found suitable for as raw material for biodiesel production.

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