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| 尿素包合法制备桐油C18不饱和脂肪酸甲酯的工艺优化研究 |
| Optimization of preparation of C18 unsaturated fatty acid methyl esters from tung oil by urea adduction fractionation |
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| DOI： |
| 中文关键词: 桐油 C18不饱和脂肪酸甲酯 尿素包合法 含量 |
| 英文关键词:tung oil C18 unsaturated fatty acid methyl esters urea adduction fractionation method content |
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| 中文摘要: |
| 以桐油通过酯交换反应制得的桐油脂肪酸甲酯为原料，以无水乙醇为溶剂，采用尿素包合法分离其中的C18不饱和脂肪酸甲酯。以C18不饱和脂肪酸甲酯含量和收率为评价指标，探究了尿素用量、无水乙醇用量、包合温度、包合时间对桐油脂肪酸甲酯分离效果的影响。通过正交实验设计优化得到最佳工艺条件。对桐油C18不饱和脂肪酸甲酯的溶剂性能进行了测定。结果表明，尿素用量是影响C18不饱和脂肪酸甲酯含量的主要因素，C18不饱和脂肪酸甲酯制备最佳工艺条件为尿素与桐油脂肪酸甲酯质量比1∶?1、无水乙醇体积与桐油脂肪酸甲酯质量比5∶?1、包合温度5?℃、包合时间18 h，在此条件下C18不饱和脂肪酸甲酯含量可达99.28%，收率为54.93%。得到的桐油C18不饱和脂肪酸甲酯的闪点（190?℃）、沸点（320?℃）高，有机挥发物未检出，贝壳松脂丁醇值（KB）为59，证明其是一种环境友好型溶剂。 |
| 英文摘要: |
| Tung oil fatty acid methyl esters were prepared from tung oil by transesterification reaction, and the C18 unsaturated fatty acid methyl esters were separated from tung oil fatty acid methyl esters by urea adduction fractionation method with absolute ethanol as solvent. Taking the content and yield of C18 unsaturated fatty acid methyl esters as evaluation indexes, the effects of urea dosage, absolute ethanol dosage, adduction fractionation temperature and adduction fractionation time on the separation effect were investigated. The preparation conditions were optimized by orthogonal experiment, and the solvent properties of C18 unsaturated fatty acid methyl esters were determined. The results showed that urea dosage was the main factor affecting content of C18 unsaturated fatty acid methyl esters, and the optimal preparation conditions were obtained as follows: mass ratio of urea to tung oil fatty acid methyl esters 1∶?1, ratio of absolute ethanol volume to fatty acid methyl esters mass 5∶?1, adduction fractionation temperature 5?℃ and adduction fractionation time 18 h. Under these conditions, the content and yield of C18 unsaturated fatty acid methyl esters were 99.28% and 5493% respectively. The flash point (190?℃) and boiling point (320?℃) of the C18 unsaturated fatty acid methyl esters were high, the volatile organic compounds were not detected, and the KB value was 59, which proved that it was an environmentally friendly solvent. |
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