Two-stage dilute hydrochloric acid (DA)/aqueous ammonia wet oxidation (AWO) pretreatment was used to recover the sugars of corn stover. The morphology characterizations of samples were detected by SEM, BET and SXT. The results showed that DA-AWO process demonstrated a positive effect on sugar recovery compared to AWO-DA. 82.8% of xylan was recovered in the first stage of DA-AWO process at 120 °C for 40 min with 1 wt% HCl. The second stage was performed under relative mild reaction conditions (130 °C, 12.6 wt% ammonium hydroxide, 3.0 MPa O₂, 40 min), and 86.1% lignin could be removed. 71.5% of glucan was achieved with a low enzyme dosage (3 FPU·g⁻¹) in the following enzymatic hydrolysis. DA-AWO pretreatment was effective due to its sufficient hydrolysis of hemicellulose in the first stage and remarkably removal of the lignin in the second stage, resulting in high sugar recovery with a low enzyme dosage.

采用两级稀盐酸（DA）/氨水湿式氧化（AWO）预处理回收玉米秸秆中的糖分。样品的形貌特征通过SEM，BET和SXT检测。结果表明，与AWO-DA相比，DA-AWO工艺对糖回收具有积极作用。在DA-AWO工艺的第一阶段中，用1 wt％的HCl在120°C下进行40分钟回收了82.8％的木聚糖。相对温和的反应条件下进行第二阶段（130℃，12.6重量％的氢氧化铵，3.0兆帕Ô ₂，40分钟），和86.1％的木质素可以被移除。低酶剂量（3 FPU·g ^-1）在以下的酶促水解中。DA-AWO预处理之所以有效，是因为其在第一阶段中将半纤维素充分水解，并在第二阶段中显着去除了木质素，从而以低酶剂量实现了高糖回收率。