Puke Maris, Godina Daniela, Brazdausks Prans, Rizikovs Janis, Fridrihsone Velta
Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006 Riga, Latvia.
Department of Chemistry, Latvia University of Latvia, Jelgavas 1, LV-1004 Riga, Latvia.
Materials (Basel). 2022 Aug 25;15(17):5872. doi: 10.3390/ma15175872.
The necessity for the reduction in greenhouse gas emissions, the growing demand for the improvement of biorefinery technologies, and the development of new biorefining concepts oblige us as a society, and particularly us, as scientists, to develop novel biorefinery approaches. The purpose of this study is to thoroughly evaluate the leftover lignocellulosic (LC) biomass obtained after the manufacture of 2-furaldehyde, with the intention of further valorizing this resource. This study demonstrates that by using thermomechanical and alkaline peroxide mechanical pulping techniques, birch wood chips can be used in the new biorefinery processing chain for the production of 2-furaraldehyde, acetic acid, and cellulose pulp. In addition, the obtained lignocellulosic residue is also characterized. To produce a lignocellulosic material without pentoses and with the greatest amount of cellulose fiber preserved for future use, a novel bench-scale reactor technology is used. Studies were conducted utilizing orthophosphoric acid as a catalyst to deacetylate and dehydrate pentose monosaccharides found in birch wood, converting them to 2-furaldehyde and acetic acid. The results showed that, with the least amount of admixtures, the yields of the initial feedstock's oven-dried mass (o.d.m.) of 2-furaldehyde, acetic acid, and lignocellulose residue ranged from 0.04 to 10.84%, 0.51 to 6.50%, and 68.13 to 98.07%, respectively, depending on the pretreatment conditions utilized. The ideal 2-furaldehyde production conditions with reference to the purity and usability of cellulose in residual lignocellulosic material were also discovered through experimental testing. The experiment that produced the best results in terms of 2-furaldehyde yield and purity of residual lignocellulose used a catalyst concentration of 70%, a catalyst quantity of 4%, a reaction temperature of 175 °C, and a treatment period of 60 min. It was possible to create pulp with a tensile index similar to standard printing paper by mechanically pulping the necessary LC residue with alkaline peroxide, proving that stepwise 2-furaldehyde production may be carried out with subsequent pulping to provide a variety of value-added goods.
减少温室气体排放的必要性、对生物精炼技术改进的需求不断增长以及新生物精炼概念的发展，迫使我们作为一个社会群体，尤其是作为科学家的我们，去开发新的生物精炼方法。本研究的目的是全面评估在生产2-糠醛后获得的剩余木质纤维素（LC）生物质，以便进一步利用这一资源。本研究表明，通过使用热机械和碱性过氧化物机械制浆技术，桦木片可用于新的生物精炼加工链，以生产2-糠醛、乙酸和纤维素浆。此外，还对获得的木质纤维素残渣进行了表征。为了生产不含戊糖且保留最大量纤维素纤维以供未来使用的木质纤维素材料，采用了一种新型的实验室规模反应器技术。利用正磷酸作为催化剂进行研究，使桦木中发现的戊糖单糖脱乙酰化并脱水，将它们转化为2-糠醛和乙酸。结果表明，根据所采用的预处理条件，在杂质最少的情况下，2-糠醛、乙酸和木质纤维素残渣的初始原料绝干质量（o.d.m.）产率分别为0.04%至10.84%、0.51%至6.50%和68.13%至98.07%。通过实验测试还发现了关于残余木质纤维素材料中纤维素纯度和可用性的理想2-糠醛生产条件。在2-糠醛产率和残余木质纤维素纯度方面产生最佳结果的实验，使用的催化剂浓度为70%、催化剂用量为4%、反应温度为175℃、处理时间为60分钟。通过用碱性过氧化物对所需的LC残渣进行机械制浆，可以制造出具有与标准印刷纸相似拉伸指数的纸浆，证明可以通过后续制浆进行分步2-糠醛生产，以提供各种增值产品。
