乙氧基化脂肪酸甲酯产品中副产物二酯量的测定  

Determination of diester content in ethoxylated fatty acid methyl ester product

作　　者：吴文清[1] 孙永强[1] 田春花[1] 刘广宇[1] 史修启[1] 张勇[1] 

机构地区：[1]中国日用化学工业研究院,山西太原030001

出　　处：《日用化学工业》2010年第4期301-303,共3页China Surfactant Detergent & Cosmetics

基　　金："十一五"国家科技支撑计划资助项目(2007BAE52B00)

摘　　要：建立了测定乙氧基化脂肪酸甲酯产品(EME)中副产物二酯含量的分析方法。将EME产品(混合碳链,约80%为C12和C14,平均EO数n=8)混合均匀、过滤、离心处理后,取下层样品,去除聚乙二醇(PEG)之后在碱性条件下将其水解。考察了两种不同亲水基收集方法对其收率的影响,所得亲水基用核磁共振氢谱(1HNMR)测定其-OH氢和-OCH3氢的物质的量比,进而得出EME产品中副产物二酯的含量。结果表明,先用三氯甲烷萃取,再对经萃取后的水相部分进行后处理的收集方法完全满足实验需要,亲水基部分的收率可达63%左右;其下层中二酯的摩尔分数为16%。An analysis method for determining diester content in ethoxylated fatty acid methyl ester（EME） product was developed.The EME product（composed with EME of mixed carbon chain length,in which 80% belongs to C12～ C14 with average EO number of 8） was mixed,filtrated and centrifuged.Sample was taken from the lower layer of the centrifuged product.Then the sample,after removal of the PEG containing in the sample was hydrolyzed under alkaline condition.Two methods for separation and collection of hydrophilic and hydrophobic material in the hydrolyzed reaction mixture were examined for comparison of effect of separation and collection method on the recovery of the hydrophilic material.The mole ratio of hydrogen containing in-OH group and-OCH3 group in the hydrophilic material was analyzed by ^1HNMR and thereby the content of diester in EME product is determined.The experimental results showed that the method,which treating the aqueous solution after chloroform extraction to recover the lower molecular PEG can cause the total recovery of the hydrophilic material achieving 63%.The mole percentage of diester contained in the sample of EME product is about 16%.

关 键 词：乙氧基化脂肪酸甲酯产品 二酯 水解 亲水基 核磁共振 

分 类 号：TQ423.2[化学工程]