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| 冷冻结晶法脱除生物柴油中的饱和脂肪酸酯制备脂肪酸酯类抗磨剂 |
| Preparation of fatty acid ester antiwear agent by freezing crystallization method for removing saturated fatty acid ester in biodiesel |
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| DOI： |
| 中文关键词: 生物柴油 冷冻结晶 抗磨剂 |
| 英文关键词:biodiesel freezing crystallization antiwear agent |
| 基金项目: |
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| 中文摘要: |
| 为脱除饱和脂肪酸甲酯，得到合格的脂肪酸酯类柴油抗磨剂（饱和脂肪酸酯含量不高于2.5%），以生物柴油为原料，采用冷冻结晶法，考察了冷冻温度、搅拌速度、冷冻方式和原料组成对饱和脂肪酸甲酯脱除效果的影响。结果表明：过高的搅拌速度产生细小晶体，不利于晶体和熔融液的分离；冷冻温度与原料中棕榈酸甲酯的含量有关，当原料中棕榈酸甲酯的含量低于1.2%时，在-5?℃下静置冷冻结晶，可以得到符合抗磨剂要求的产品，如果原料中棕榈酸甲酯的含量超过1.2%，必须在-20?℃下进行静置冷冻结晶处理；逐级降温静置冷冻结晶方法有利于提高生物柴油中饱和脂肪酸甲酯的脱除效果和脂肪酸甲酯的收率, 在-15?℃下处理即可获得符合抗磨剂要求的产品。 |
| 英文摘要: |
| In order to obtain the qualified fatty acid ester diesel antiwear agent（content of saturated fatty acid ester not more than 2.5%）, saturated fatty acid ester was removed from biodiesel by freezing crystallization method. The effects of freezing temperature, stirring speed, freezing mode and composition of raw material on the removal of saturated fatty acid methyl ester were investigated. The results showed that high stirring speed could result in production of fine particles, and it was difficult in solid-liquid separation. The freezing temperature was related to the content of methyl palmitate in raw material. When the content of methyl palmitate in raw material was less than 1.2%, the product meeting the requirement of antiwear agent was obtained at the freezing temperature -5?℃. When the content of methyl palmitate in raw material was more than 1.2%, it should be treated at the freezing temperature-20?℃.The gradual cooling crystallization method could improve the removal efficiency of saturated fatty acid methyl ester and the yield of fatty acid methyl ester, and the product obtained at -15?℃ could meet the requirement of antiwear agent. |
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