In this work, the promotion effect of NaCl on the conversion of xylose to furfural in H₂O was studied. It was found that xylose conversion and furfural yield increased with NaCl concentration. NaCl decreased the pH of the solution providing H⁺ for the acid catalytic dehydration of xylose. The formation of oligomers was determined by GPC and ESI‐MS in the initial stage of reaction, especially at low temperature. Excess NaCl promoted the formation of humins in the late stage of the reaction. NaCl could also change the decomposition route of formic acid. Meanwhile, NaCl had the ability of phase separation. Combining these effects with organic solvent during the reaction could inhibit the formation of humins and increase the yield of furfural. In NaCl‐H₂O‐THF biphasic system without other catalyst, the optimal furfural yield of 76.7% and selectivity of 77.6% were achieved at 463 K in 2 h.

中文翻译：

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NaCl对木糖向糠醛转化的促进作用†

在这项工作中，研究了NaCl对H ₂ O中木糖转化为糠醛的促进作用。发现木糖转化率和糠醛产率随NaCl浓度的增加而增加。NaCl降低溶液的pH值，为木糖的酸催化脱水提供H ⁺。在反应初期，尤其是在低温下，通过GPC和ESI-MS确定了低聚物的形成。在反应的后期，过量的氯化钠会促进腐殖质的形成。NaCl还可改变甲酸的分解途径。同时，NaCl具有相分离的能力。在反应过程中将这些作用与有机溶剂结合可以抑制腐殖质的形成并增加糠醛的收率。在NaCl-H _2中不含其他催化剂的O-THF双相系统，在463 K在2小时内达到了74.7％的最佳糠醛收率和77.6％的选择性。