Forest Product Biotechnology/Bioenergy Group, Department of Wood Science, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1 Z4, Canada.
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Department of Wood Science, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1 Z4, Canada.
Bioresour Technol. 2021 Mar;324:124664. doi: 10.1016/j.biortech.2021.124664. Epub 2021 Jan 7.
Previous work has shown that sulfonation and oxidation of chemi-thermomechanical pulps (CTMPs) significantly enhanced enzyme accessibility to cellulose while recovering the majority of carbohydrates in the water-insoluble component. In the work reported here, modified (sulfonated and oxidized) CTMPs derived from hard-and-softwoods were used to produce a DL-mix of lactic acid via a chemo-catalytic approach using lanthanide triflate (Ln (OTf)) catalysts (Ln = La, Nd, Er, and Yb). It was apparent that sulfonation and oxidation of chemi-thermomechanical pulps (CTMPs) also enhanced Ln(OTf) catalyst accessibility to the carbohydrate components of the pulps, with the Er(OTf) catalysts resulting in significant lactic acid production. Under optimum conditions (250 °C, 60 min, 0.5 mmol catalyst g biomass), 72% and 67% of the respective total carbohydrate present in the hard-and-softwood CTMPs could be converted to lactic acid compared to the respective 59% and 51% yields obtained after energy-intensive ball milling.
先前的工作表明，对化学热磨机械浆（CTMP）进行磺化和氧化处理，在回收不溶于水的成分中大部分碳水化合物的同时，还能显著提高纤维素对酶的可及性。在本报告的工作中，使用源自硬木和软木的改性（磺化和氧化）CTMP 通过使用镧系三氟甲磺酸酯（Ln（OTf））催化剂（Ln = La、Nd、Er 和 Yb）的化学催化方法生产 DL-乳酸。显然，对 CTMP 的磺化和氧化也增强了 Ln（OTf）催化剂对纸浆碳水化合物成分的可及性，其中 Er（OTf）催化剂导致乳酸产量显著增加。在最佳条件下（250°C，60 分钟，0.5mmol 催化剂 g 生物质），与经过能量密集的球磨处理后分别获得的 59%和 51%的收率相比，硬木和软木 CTMP 中存在的各自总碳水化合物中分别有 72%和 67%可以转化为乳酸。
