In the frame of lignocellulosic biomass valorization into chemicals or fuels, developing separation methods for streams of carbohydrates by chromatographic separation is necessary. One of the famous separations based on adsorption, is glucose and fructose separation using a SMB technology with ion-exchanged resin. Second generation carbohydrates like glucose and xylose are the main building blocks for various applications including chemicals are fuels, however the fractionation step of these mixtures is needed. In this work, we prepared and characterized X and Y zeolites exchanged by K, Ca, Sr and Ba as potential adsorbents for xylose/glucose separation. We tested their separation performance with adsorption breakthrough experiments. We find that BaX and BaY are the most selective with a selectivity inversion (xylose/glucose selectivity of 1.52 and 0.67 respectively). Addition of ethanol as co-solvent show the higher uptakes of both sugars and changes of selectivities in some adsorbents.

中文翻译：

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突破性实验深入研究碱土交换八面沸石吸附分离葡萄糖和木糖


在将木质纤维素生物质增值为化学品或燃料的框架中，有必要开发通过色谱分离的碳水化合物流的分离方法。基于吸附的著名分离之一是使用离子交换树脂的 SMB 技术分离葡萄糖和果糖。第二代碳水化合物（如葡萄糖和木糖）是各种应用（包括化学品和燃料）的主要组成部分，但需要对这些混合物进行分馏步骤。在这项工作中，我们制备并表征了由 K、Ca、Sr 和 Ba 交换的 X 和 Y 沸石，作为木糖/葡萄糖分离的潜在吸附剂。我们通过吸附突破实验测试了它们的分离性能。我们发现 BaX 和 BaY 是最具选择性的，具有选择性反转（木糖/葡萄糖选择性分别为 1.52 和 0.67）。添加乙醇作为共溶剂显示出两种糖的吸收率更高，并且某些吸附剂的选择性发生了变化。