The consumption and production of biodiesel has grown dramatically in recent decades, motivated by a strong interest in renewable energy. This has generated a surplus of its main by‐product, glycerol. Several catalytic processes have been proposed to generate alternatives for using this excess glycerol, mainly focusing on its transformation into high value‐added chemical products. Various products, ranging from syngas to organic acids, such as acrylic or lactic acid, along with 1,2‐propanediol, 1,3‐propanediol, glycerol ethers or even polymers, have been produced starting from glycerol. Among this multitude of possibilities, the production of lactic acid is one of the most interesting alternatives to valorize glycerol, because of the wide range of applications described for this organic acid. This review focuses on recent studies dealing with the catalytic conversion of glycerol to lactic acid, using different heterogeneous catalysts, and evaluates the factors influencing the oxidation catalytic process and the proposed reaction mechanisms. Finally, recent studies on the separation and purification of lactic acid using ion exchange chromatography resins are also reported. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd

中文翻译：

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甘油增值：通过非均相催化转化为乳酸，并通过离子交换色谱分离

近几十年来，由于对可再生能源的强烈兴趣，生物柴油的消费和生产急剧增长。这产生了其主要副产物甘油的过剩。已经提出了几种催化方法来产生使用这种过量甘油的替代方法，主要集中在将其转化成高附加值的化学产品上。从甘油开始生产了各种产品，从合成气到有机酸，例如丙烯酸或乳酸，以及1,2-丙二醇，1,3-丙二醇，甘油醚甚至聚合物。在众多可能性中，乳酸的生产是丙三醇增价最有趣的替代方法之一，因为该有机酸的应用范围很广。这篇综述集中于使用不同的非均相催化剂处理甘油催化转化为乳酸的最新研究，并评估了影响氧化催化过程的因素和提出的反应机理。最后，最近也报道了使用离子交换色谱树脂分离和纯化乳酸的最新研究。©2019年化学工业协会和John Wiley＆Sons，Ltd