蓖麻油酸甲酯合成和高温裂解反应条件优化
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摘要
先用蓖麻油和甲醇酯交换合成蓖麻油酸甲酯,再对蓖麻油酸甲酯进行高温裂解制备十一碳烯酸,探讨各种因素对蓖麻油酸甲酯合成和裂解的影响,得到较为适宜的反应条件。合成蓖麻油酸甲酯适宜的条件为:系统真空度0. 095 MPa,反应时间4 h,甲醇钠催化剂质量为蓖麻油质量的3. 00%,反应温度35℃,醇油物质的量比18∶1,该条件下,蓖麻油酸甲酯收率为86. 4%; 550℃裂解蓖麻油酸甲酯为最佳温度,十一碳烯酸收率为44. 15%。
In this study,methyl ricinoleate was firstly synthesized by transesterification of castor oil and methanol,and then methyl ricinoleate was pyrolyzed for synthesis of undecylenic acid. Effects of various factors on the synthesis and cracking of methyl ricinoleate were investigated to achieve optimal reaction conditions. It was concluded that the optimal conditions for synthesis of methyl ricinoleate were system vacuum of 0. 095 MPa,reaction time of 4 h,mass of sodium methoxide catalyst of 3. 00% of mass of castor oil,reaction temperature of 35 ℃,alcohol to oil molar ratio of 18 ∶ 1 and yield of ricinoleic acid methyl ester was 86. 4%. Methyl ricinoleate was cracked at 550 ℃ as the optimal temperature,and yield of undecylenic acid was 44. 15%.
In this study,methyl ricinoleate was firstly synthesized by transesterification of castor oil and methanol,and then methyl ricinoleate was pyrolyzed for synthesis of undecylenic acid. Effects of various factors on the synthesis and cracking of methyl ricinoleate were investigated to achieve optimal reaction conditions. It was concluded that the optimal conditions for synthesis of methyl ricinoleate were system vacuum of 0. 095 MPa,reaction time of 4 h,mass of sodium methoxide catalyst of 3. 00% of mass of castor oil,reaction temperature of 35 ℃,alcohol to oil molar ratio of 18 ∶ 1 and yield of ricinoleic acid methyl ester was 86. 4%. Methyl ricinoleate was cracked at 550 ℃ as the optimal temperature,and yield of undecylenic acid was 44. 15%.
引文
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[4]李凤娟,王昌禄,王玉荣,等.蓖麻油快速甲酯化方法及其脂肪酸含量分析[J].中国粮油学报,2009,24(6):52-55.Li Fengjuan,Wang Changlu,Wang Yurong,et al. Castor OilImproved Methyl Esterification and Fatty Acid Composition[J]. Journal of the Chinese Cereals and Oils Association,2009,24(6):52-55.
[5]靳福全,邹丽君,刘幼平,等.蓖麻油制十一烯酸和庚醛[J].华北工学院学报,1996,17(2):160-164.Jin Fuquan,Zou Lijun,Liu Youping,Et al. Undecylenic acid and heptaldehyde from castor oil[J]. Journal of North China Institute of Technology,1996,17(2):160-164.