The separation of butanediol and propanediol by simulated moving bed

Liang, Ming-Tsai; Lin, Chih-Hsiung; Tsai, Pei-Ying; Wang, Hsiang-Ping; Wan, Hou‐Peng; Yang, Tzu-Yueh

doi:10.1016/j.jtice.2015.12.003

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…After acid hydrolysis (1.2 wt% sulphuric acid, 180 °C, 1 h) of the liquid stream, 3.58 g/L furfural could be produced from 11.68 g xylose (detail not shown). BDO solvent was proposed to be well separated from water using Mitsubishi SP70, a kind of macroporous adsorption resin (Mitsubishi Chemical Corporation, Japan) [ 18 ]. After separation, BDO could be reused in the pretreatment of lignocellulosic biomass [ 19 ], and water could be reused to wash the pretreated solid, reducing the possible inhibition of enzymatic hydrolysis and subsequent fermentation by BDO and degradation products from carbohydrate and lignin.…”

Section: Resultsmentioning

confidence: 99%

“…For example, the precipitated lignin benefited from high phenolic content and reduced molecular weight, which could be utilized as antioxidants [ 16 ], and the dissolved hemicellulose could be upgraded to furanic platform chemicals [ 17 ]. Moreover, it had been demonstrated that BDO could be well recovered from water using Mitsubishi SP70 adsorbent, a kind of macroporous adsorption resin, instead of energy-consuming vaporization process for BDO recovery [ 18 ]. After separation through adsorption, BDO could be reused in the pretreatment of lignocellulosic biomass [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of acid- and alkali-catalyzed 1,4-butanediol pretreatment for co-production of fermentable sugars and value-added lignin compounds

Xie

Chen

Tong

et al. 2023

Biotechnol Biofuels

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Background Organosolv pretreatment is one of the most efficient methods for delignification and boosting biomass saccharification. As compared to typical ethanol organosolv pretreatments, 1,4-butanediol (BDO) organosolv pretreatment is a high-boiling-point solvent pretreatment, which can generate low pressure in the reactor during high temperature cooking that improves the operation safety. Although several studies showed that organosolv pretreatment can lead to effective delignification and enhancement in glucan hydrolysis, there has been no studies on acid- and alkali-catalyzed BDO pretreatment, as well as their comparison on promoting biomass saccharification and lignin utilization. Results It was shown that BDO organosolv pretreatment was more effective in removing lignin from poplar as compared with typical ethanol organosolv pretreatment under the same pretreatment conditions. HCl-BDO pretreatment with 40 mM acid loading led to 82.04% of original lignin removed from biomass, as compared to the lignin removal of 59.66% in HCl-Ethanol pretreatment. Besides, acid-catalyzed BDO pretreatment was more effective in improving the enzymatic digestibility of poplar than alkali-catalyzed BDO pretreatment. As a result, HCl-BDO with acid loading of 40 mM provided a good enzymatic digestibility of cellulose (91.16%) and the maximum sugar yield of 79.41% from original woody biomass. The linear correlations between physicochemical structure (e.g., fiber swelling, cellulose crystallinity, crystallite size, surface lignin coverage and cellulose accessibility) changes of BDO pretreated poplar and enzymatic hydrolysis were plotted to figure out the main factors that influenced biomass saccharification. Moreover, acid-catalyzed BDO pretreatment mainly brought about the phenolic hydroxyl (PhOH) groups formation in lignin structure, while alkali-catalyzed BDO pretreatment mostly led to the lower molecular weight of lignin. Conclusions Results indicated that the acid-catalyzed BDO organosolv pretreatment could significantly improve enzymatic digestibility of the highly recalcitrant woody biomass. The great enzymatic hydrolysis of glucan resulted from increased cellulose accessibility, which mostly associated with the higher degree of delignification and hemicellulose solubilization, as well as the more increase in fiber swelling. Besides, lignin was recovered from the organic solvent, which could be used as natural antioxidants. The formation of phenolic hydroxyl groups in lignin structure and the lower molecular weight of lignin contributed to its greater radical scavenging capacity.

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Section: Resultsmentioning

confidence: 99%