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Step-change flow rate liquid hot water pretreatment of sweet sorghum bagasse for enhancement of total sugars recovery

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  • Yu, Qiang
  • Zhuang, Xinshu
  • Yuan, Zhenhong
  • Wang, Wen
  • Qi, Wei
  • Wang, Qiong
  • Tan, Xuesong

Abstract

A step-change flow rate liquid hot water (SCFLHW) process was developed with the objective of improving the total sugars recovery including xylose and glucose from sweet sorghum bagasse (SSB). Total xylose yield increased from 60% for batch system (4.25% w/v, 18 min, 184 °C) to about 80% at an initial flow rate of 20 ml/min for 8 min, followed by a rate of 10 ml/min for 10 min. It was hypothesized that the flowing water could enhance the mass transfer and improves the sugars recovery. Although little lignin was removed, the 72 h enzymatic digestibility of treated sample was enhanced by the increase of flow rate. The lignin droplet redeposited on the surface of residual solids might play a crucial role in determining the enzymatic digestibility. The total recovery of sugars from SSB, after the pretreatment (first with the flow rate of 20 ml/min for 8 min, then 10 ml/min for 10 min) and 72 h enzymatic digestion, reached 83.7%, which is superior to the recovery using the SO2-steam pretreatment or ammonia fiber expansion.

Suggested Citation

  • Yu, Qiang & Zhuang, Xinshu & Yuan, Zhenhong & Wang, Wen & Qi, Wei & Wang, Qiong & Tan, Xuesong, 2011. "Step-change flow rate liquid hot water pretreatment of sweet sorghum bagasse for enhancement of total sugars recovery," Applied Energy, Elsevier, vol. 88(7), pages 2472-2479, July.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:7:p:2472-2479
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    References listed on IDEAS

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    Cited by:

    1. Banerji, Aditi & Balakrishnan, M. & Kishore, V.V.N., 2013. "Low severity dilute-acid hydrolysis of sweet sorghum bagasse," Applied Energy, Elsevier, vol. 104(C), pages 197-206.
    2. Pham, Huong Thi Thu & Nghiem, Nhuan P. & Kim, Tae Hyun, 2018. "Near theoretical saccharification of sweet sorghum bagasse using simulated green liquor pretreatment and enzymatic hydrolysis," Energy, Elsevier, vol. 157(C), pages 894-903.
    3. Zhu, Shengdong & Huang, Wenjing & Huang, Wangxiang & Wang, Ke & Chen, Qiming & Wu, Yuanxin, 2015. "Pretreatment of rice straw for ethanol production by a two-step process using dilute sulfuric acid and sulfomethylation reagent," Applied Energy, Elsevier, vol. 154(C), pages 190-196.
    4. Tae Hoon Kim & Seung Hyeon Park & Tin Diep Trung Le & Tae Hyun Kim & Kyeong Keun Oh, 2022. "Effects of Colloid Milling and Hot-Water Pretreatment on Physical Properties and Enzymatic Digestibility of Oak Wood," Energies, MDPI, vol. 15(6), pages 1-15, March.

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