Impact of delignification on the morphology and the reactivity of steam exploded wheat straw

Huron, Maïté; Hudebine, Damien; Ferreira, Nicolas Lopes; Lachenal, Dominique

doi:10.1016/j.indcrop.2015.10.040

Cited by 14 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ZCR has a relatively long cool-down period, where pressure in the reactor is slowly released, in contrast to the rapid pressure release and cooling experienced in the SER and the LHR as a result of flashing the material as it exits the reactor. Flashing the material results in a sudden transition of liquid entrained within biomass particle cell walls to gas, which has been reported to significantly disrupt cell walls and lead to increased digestibility during enzymatic saccharification [ 7 , 8 , 20 ].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Assessing pretreatment reactor scaling through empirical analysis

Lischeske

Crawford

Kuhn

et al. 2016

Biotechnol Biofuels

View full text Add to dashboard Cite

BackgroundPretreatment is a critical step in the biochemical conversion of lignocellulosic biomass to fuels and chemicals. Due to the complexity of the physicochemical transformations involved, predictively scaling up technology from bench- to pilot-scale is difficult. This study examines how pretreatment effectiveness under nominally similar reaction conditions is influenced by pretreatment reactor design and scale using four different pretreatment reaction systems ranging from a 3 g batch reactor to a 10 dry-ton/days continuous reactor. The reactor systems examined were an automated solvent extractor (ASE), steam explosion reactor (SER), ZipperClave®Reactor (ZCR), and large continuous horizontal screw reactor (LHR). To our knowledge, this is the first such study performed on pretreatment reactors across a range of reaction conditions and at different reactor scales.ResultsThe comparative pretreatment performance results obtained for each reactor system were used to develop response surface models for total xylose yield after pretreatment and total sugar yield after pretreatment followed by enzymatic hydrolysis. Near- and very-near-optimal regions were defined as the set of conditions that the model identified as producing yields within one and two standard deviations of the optimum yield. Optimal conditions identified in the smallest scale system (the ASE) were within the near-optimal region of the largest scale reactor system evaluated. The maximum total sugar yields for the ASE and LHR were , while was the optimum observed in the ZipperClave.ConclusionsThe optimum condition identified using the automated and less costly to operate ASE system was within the very-near-optimal space for the total xylose yield of both the ZCR and the LHR, and was within the near-optimal space for total sugar yield for the LHR. This indicates that the ASE is a good tool for cost effectively finding near-optimal conditions for operating pilot-scale systems. Additionally, using a severity factor approach to optimization was found to be inadequate compared to a multivariate optimization method. Finally, the ASE and the LHR were able to enable significantly higher total sugar yields after enzymatic hydrolysis relative to the ZCR, despite having similar optimal conditions and total xylose yields. This underscores the importance of mechanical disruption during pretreatment to improvement of enzymatic digestibility.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-016-0620-0) contains supplementary material, which is available to authorized users.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Together, these data lend support to the idea that disruption of cell walls through steam explosion or lignin removal is an important part of preparing biomass for enzymatic hydrolysis. In this dataset, we see that steam explosion and lignin removal have approximately the same impact on improving digestibility [ 20 ].…”

Section: Discussionmentioning

confidence: 99%

Assessing pretreatment reactor scaling through empirical analysis

Lischeske

Crawford

Kuhn

et al. 2016

Biotechnol Biofuels

View full text Add to dashboard Cite

show abstract

“…Few studies reported the hydrolyzation of cellulose or hemicellulose directly from raw material without pretreatment [17,18]. Homogeneous and heterogeneous catalysis reactions degrade the rigidity and reticulate structural features of lignocelluloses [19][20][21][22]. The homogeneous catalysis technique is not suitable for industrial production; it has several disadvantages, such as high corrosion of the equipment, separation issues, poor recovery and reuse of the catalyst, and high production cost [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Efficient and Selective Catalytic Conversion of Hemicellulose in Rice Straw by Metal Catalyst under Mild Conditions

et al. 2020

View full text Add to dashboard Cite

Rice straw is an abundant material with the potential to be converted into a sustainable energy resource. Transition-metal catalysis activated the C–O bond in the hemicellulose of raw rice straw, cleaving it to form monosaccharides. The mechanism of rice straw catalytic conversion had a synergistic effect due to in situ acid catalysis and metal catalysis. The conditions for the hydrogenation of hemicellulose from rice straw were optimized: catalyst to rice straw solid/solid ratio of 3:10, stirring speed of 600 r/min, temperature of 160 °C, time of 3 h, solid/liquid ratio of 1:15, and H2 gas pressure of 1.5 MPa. An excellent hemicellulose conversion of 97.3% with the yields of xylose and arabinose at 53.0% and 17.3%, respectively, were obtained. The results from FTIR and SEM experiments also confirmed the destruction of the rigidity and reticulate structure of rice straw after the catalytic reaction.

show abstract