In this study, the non-catalytic supercritical method has been studied in utilizing dimethyl carbonate. It was demonstrated that, the supercritical dimethyl carbonate process without any catalysts applied, converted triglycerides to fatty acid methyl esters with glycerol carbonate and citramalic acid as by-products, while free fatty acids were converted to fatty acid methyl esters with glyoxal. After 12 min of reaction at 350 degrees C/20 MPa, rapeseed oil treated with supercritical dimethyl carbonate reached 94% (w/w) yield of fatty acid methyl ester. The by-products from this process which are glycerol carbonate and citramalic acid are much higher in value than glycerol produced by the conventional process. In addition, the yield of the fatty acid methyl esters as biodiesel was almost at par with supercritical methanol method. Therefore, supercritical dimethyl carbonate process can be a good candidate as an alternative biodiesel production process.

译文

在这项研究中,研究了非催化超临界方法在碳酸二甲酯中的利用。结果表明,在不使用任何催化剂的情况下,超临界碳酸二甲酯工艺将甘油三酸酯转化为脂肪酸甲酯,以碳酸甘油三酯和柠檬酸为副产物,而游离脂肪酸用乙二醛转化为脂肪酸甲酯。在350 ℃/20 mpa下反应12分钟后,用超临界碳酸二甲酯处理的菜籽油的脂肪酸甲酯产率达到94% (w/w)。与传统方法生产的甘油相比,该方法的副产品是碳酸甘油酯和柠檬酸,其价值要高得多。此外,作为生物柴油的脂肪酸甲酯的收率几乎与超临界甲醇法相当。因此,超临界碳酸二甲酯工艺可以作为替代生物柴油生产工艺的良好候选。

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