摘要
把动植物油脂中的三酰基甘油转化成脂肪酸甲酯是生产生物柴油的主要方法。棕榈油和大豆油等可食用油的酸值低,酯交换方法比较成熟,产品易满足生物柴油标准(如ASTM P121)。随着食用油脂的价格上涨,开辟更廉价和来源更广泛的生物柴油原料的任务越来越迫切,如直接用酸值较高的植物毛油,甚至用食用油精炼副产的皂脚生产生物柴油,由于这些劣质原料中含有三酰基甘油以外的组分,酯交换后酸值仍较高,不能达到生物柴油的酸值标准。用核磁共振碳谱法(13C-NMR)分析了麻风树籽毛油和皂化精炼副产的皂脚酸化油,着重分析了三酰基甘油以外的组分。分析结果表明,劣质原料中游离脂肪酸和未完全酰化甘油可能是造成甲酯化产物收率低和酸值高的原因。
Trans-esterification of vegetable oils such as the edible palm oil and soybean oil with very low acid number(<1 mg KOH/g) is usually used to produce bio-diesel.The oil is easy to meet the specification of acid number(<0.5 mg KOH/g).However.there is a need to find the new feeds even though the quality would be lower and the composition is more complicated as the increase of price and the limitation of resource of edible vegetable oils further burden the issue.There are more difficulties in the composit...
出处
《现代化工》
CAS
CSCD
北大核心
2008年第S2期73-78,共6页
Modern Chemical Industry
