Preparation and properties of lubricant base oils from castor oil methyl esters
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摘要：
蓖麻油甲酯(FAME)是蓖麻油与甲醇通过酯交换反应生成得到,将FAME与甲酸和过氧化氢,在催化剂硫酸作用下,发生环氧化反应生成环氧脂肪酸甲酯(EFAME).研究了H2O2的滴加温度,反应温度,反应时间,H2O2/HCOOH/FAME物质的量比,催化剂用量等环氧化反应条件.对产品的碘值,环氧值,黏度(40℃),倾点,凝点和氧化稳定性进行了测定.结果表明,相比FAME,EFAME的碘值从80.1g/(100g)降至2.8g/(100g),环氧值从0.03mol/100g增加至1.75mol/100g,因此,EFAME的氧化稳定性显著提高,但是低温流动性变差,黏度也增加.在下列条件:H2O2滴加温度50℃,反应温度50℃,反应时间10h,n(H2O2)∶n(HCOOH)∶n(FAME)=5∶1∶1,催化剂用量1.5g,环氧化反应产物的氧化稳定性较好,缓和氧化后非挥发相的酸值X1为0.7×10^-6mgKOH/g,缓和氧化后挥发相的酸值X2为0.5×10^-8mgKOH/g,深度氧化后沉积物含量X3为70.2%(质量分数),深度氧化后的酸值X4为3.3×10^-6mgKOH/g,相应的碘值为2.8g/(100g),环氧值1.75mol/(100g).
Castor oil methyl ester (FAME) was obtained by transesterification of castor oil with methanol. The epoxidation reaction of FAME with formic acid and hydrogen peroxide under the action of catalyst sulfuric acid produced epoxy fatty acid methyl ester(EFAME).The epoxidation conditions of H2O2 dropping temperature, reaction temperature, reaction time, H 2O 2/HCOOH/FAME molar ratio, and catalyst dosage were studied. The iodine value, epoxy value, viscosity (40℃), pour point, condensation point and oxidation stability of the product were measured. The results showed that compared with FAME, the iodine value of EFAME decreased from 80.1 g/(100 g) to 2.8 g/(100 g), and the epoxy value increased from 0.03 mol/(100g) to 1.75 mol/(100 g). Therefore, the oxidation stability of EFAME was significantly improved. However, the low-temperature fluidity deteriorates and the viscosity also increases. Under the following conditions: H2O2 dropping temperature 50℃, reaction temperature 50℃, reaction time 10 h, n (H2O2)∶ n (HCOOH)∶ n (FAME)=5∶1∶1, catalyst dosage 1.5 g, epoxidation The oxidation stability of the reaction product is good, and the acid value of the nonvolatile phase after the oxidation is moderated is 0.7×10^-6 mgKOH/g, and the acid value of the volatile phase after the oxidation is moderated is 0.5× 10^-8 mgKOH/g , and the oxidation is deep. The post-deposit content was 70.2% and the acid value after deep oxidation was 3.3× 10^-6 mgKOH/g, the corresponding iodine value was 2.8 g/(100 g), and the epoxy value was 1.75 mol/(100g).
作者：
常晓梅 袁红 张泓
Chang Xiaomei;Yuan Hong;Zhang Hong(Chemical Science and Engineering College,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China;Key Laboratory of Chemical Engineering and Technology,State Ethnic Affairs Commission,North Minzu University,Yinchuan 750021,China)
机构地区：
北方民族大学化学与化工学院 北方民族大学国家民委化工技术基础重点实验室
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2019年第4期71-78,共8页
基金：
宁夏高等学校科学技术研究项目(NGY2017157)
关键词：
环氧化 蓖麻油 氧化稳定性 低温流动性
epoxidation castor oi oxidative stability low temperature fluidity
分类号：
O530.37 [理学—等离子体物理]
