摘要
探讨了不同碳数的脂肪酸甲酯加氢制备脂肪醇的反应规律,研究了单一脂肪酸甲酯、二元混合脂肪酸甲酯及天然椰子甲酯在加氢反应中的表现,考察了温度、压力对反应转化率和选择性的影响。实验结果表明,低碳数脂肪酸甲酯在较低温度下优先转化,而高碳数脂肪酸甲酯需要更高的温度和压力才能达到较高的转化率。在混合体系中,低碳数酯肪酸甲酯的转化率受到高碳数酯肪酸甲酯的抑制,但高碳数酯肪酸甲酯的转化率有所提升。反应路径的竞争机制结果表明,脂肪酸甲酯直接加氢生成脂肪醇、脂肪醇与未反应甲酯的酯交换生成蜡酯、蜡酯进一步同甲醇反应生成脂肪酸甲酯及蜡酯在较苛刻反应条件下加氢分解为脂肪醇是主要反应路径,不同的反应体系下四种路径相互影响。高压有利于脂肪醇的生成,抑制蜡酯的生成。
This study investigates the reaction mechanisms of hydrogenation for fatty acid methyl esters(FAMEs)with different carbon numbers to produce fatty alcohols.The performance of single-component FAMEs,binary mixed FAMEs,and natural coconut-derived methyl esters in hydrogenation reactions was systematically analyzed.The effects of temperature and pressure on conversion rate and selectivity were also examined.The results indicate that low-carbon FAMEs preferentially convert at lower temperatures,while high carbon FAMEs require higher temperatures and pressures to achieve higher conversion rates.In the mixed system,the conversion rate of lowcarbon FAMEs is inhibited by high carbon FAMEs,but the conversion rate of high carbon FAMEs is improved.The competition mechanism of reaction pathways indicates that the main reaction pathways are direct hydrogenation of FAMEs to generate fatty alcohols,ester exchange of fatty alcohols with unreacted FAMEs to generate wax esters,further reaction of wax esters with methanol to generate FAMEs,and hydrogenation decomposition of wax esters into fatty alcohols under harsh reaction conditions.The four pathways interact with each other under different reaction systems.High pressure conditions are conducive to the formation of fatty alcohols and inhibit the formation of wax esters.
作者
徐凯
董松涛
郜亮
张锐
XU Kai;DONG Songtao;GAO Liang;ZHANG Rui(Sinopec Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China)
出处
《石油化工》
北大核心
2025年第11期1559-1564,共6页
Petrochemical Technology
关键词
脂肪酸甲酯
脂肪醇
加氢
碳数
fatty acid methyl ester
fatty alcohol
hydrogenation
carbon number
