The presence of soluble lignin, furfural and hydroxymethylfurfural (HMF) in industrial pre-hydrolysis liquor (PHL) from the pulping process can inhibit its bioconversion into bioethanol and other biochemicals. Although various technologies have been developed to remove these inhibitors, certain amounts of sugars are also inevitably removed during the treatment process. Hence, polystyrene divinylbenzene (PS-DVB) resin was used as an adsorptive material to simultaneously remove fermentation inhibitors while retaining sugars with high yields to improve the fermentability of PHL after acid hydrolysis by enriching its xylose concentration. The fermentability of acid-hydrolyzed PHL (A-PHL) was evaluated by the bioconversion into ethanol and xylosic acid (XA) after treatment with PS-DVB resin. The results showed that the highest xylose concentration (101.1 g/L) in PHL could be obtained by acid hydrolysis at 100 °C for 80 min with 4% acid, while the concentration of fermentation inhibitors (furfural, HMF and lignin) in PHL could also be significantly improved during the acid-hydrolysis process. After treatment with PS-DVB resin, not only were 97% of lignin, 92% of furfural, and 97% of HMF removed from A-PHL, but also 96% of xylose was retained for subsequent fermentation. With resin treatment, the fermentability of A-PHL could be improved by 162–282% for ethanol production from A-PHL containing 30–50 g/L xylose and by 18–828% for XA production from A-PHL containing 90–150 g/L xylose. These results confirmed that PS-DVB resin can remove inhibitors from PHL before producing value-added products by bioconversion. In addition, this work will ideally provide a concept for producing value-added chemicals from pre-hydrolysis liquor, which is regarded as the waste stream in the pulping process.

中文翻译：

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使用聚苯乙烯二乙烯基苯树脂从预水解液中去除发酵抑制剂

制浆过程中工业预水解液（PHL）中存在可溶性木质素，糠醛和羟甲基糠醛（HMF）可以抑制其生物转化为生物乙醇和其他生物化学物质。尽管已经开发了多种技术来去除这些抑制剂，但是在处理过程中也不可避免地要去除一定量的糖。因此，聚苯乙烯二乙烯基苯（PS-DVB）树脂用作吸附材料，可同时去除发酵抑制剂，同时保留高收率的糖分，从而通过富集木糖浓度提高酸水解后PHL的发酵能力。通过用PS-DVB树脂处理后生物转化为乙醇和木糖酸（XA）来评估酸水解PHL（A-PHL）的发酵能力。结果显示最高的木糖浓度（101。通过在100°C下用4％的酸进行80分钟的酸水解，可得到1 g / L）的PHL，而在酸水解过程中，PHL中发酵抑制剂（糠醛，HMF和木质素）的浓度也可显着提高。处理。用PS-DVB树脂处理后，不仅从A-PHL中除去了97％的木质素，92％的糠醛和97％的HMF，而且还保留了96％的木糖用于后续发酵。通过树脂处理，从含有30–50 g / L木糖的A-PHL生产乙醇，可以将A-PHL的发酵能力提高162–282％，从含有90–150的A-PHL生产XA的XA，可以提高18-828％ g / L木糖。这些结果证实，在通过生物转化生产增值产品之前，PS-DVB树脂可以从PHL中除去抑制剂。此外，