Abstract A synergistic process with steam explosion pretreatment (SEP) followed by sodium carbonate-oxygen cooking (SCOC) upon bamboo was evaluated for its effect on separating hemicellulose and lignin from bamboo while preserving cellulose, providing cellulose substrate susceptible to chemicals in producing platform chemicals such as levulinic acid. The results showed that through the SEP with 2.5 MPa for 10 min, the hemicellulose content reduced by 60.85 %, the specific surface area of bamboo fiber increased to 1.9494 m2g-1 from 0.8061 m2g-1 of raw material. The synergistic SEP-SCOC significantly removed 73.33 % lignin, and yielded 73.9 % cellulose under the optimal condition of SEP with 2.5 MPa for 10 min and followed by SCOC with 30 % total titratable alkali (TTA) at 180 °C for 2 h and 2 MPa oxygen pressure. The results also proved the total lignin removal was improved by 8.07–18.95 % for the steam exploded bamboo fibers than the untreated one, indicating SEP increased the accessibility of cooking reagents to fibre during subsequent SCOC process. Furthermore, the low value of biological oxygen demand (BOD) and chemical oxygen demand (COD) in the final spent liquor indicated the lower pollution level of the process.

中文翻译：

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汽爆预处理和碱氧化蒸煮联合工艺强化竹纤维分离

摘要 评估了蒸汽爆破预处理 (SEP) 和碳酸钠-氧气蒸煮 (SCOC) 对竹子的协同作用，评估其在保留纤维素的同时从竹子中分离半纤维素和木质素的效果，为生产平台化学品提供易受化学品影响的纤维素基材，如如乙酰丙酸。结果表明，通过2.5 MPa的SEP 10 min，半纤维素含量降低了60.85 %，竹纤维的比表面积从原料的0.8061 m2g-1增加到1.9494 m2g-1。协同SEP-SCOC显着去除了73.33 %的木质素，并在SEP 2.5 MPa 10分钟的最佳条件下产生了73.9 %的纤维素，其次是SCOC与30 %的总可滴定碱（TTA）在180°C下2小时和2 MPa 氧气压力。结果还证明，蒸汽爆破竹纤维的总木质素去除率比未经处理的竹纤维提高了 8.07-18.95%，表明 SEP 在随后的 SCOC 过程中增加了蒸煮试剂对纤维的可及性。此外，最终废液中生物需氧量 (BOD) 和化学需氧量 (COD) 的低值表明该过程的污染水平较低。