|
| 邻苯二甲酰亚胺钾催化合成生物柴油 |
| Synthesis of biodiesel catalyzed by potassium phthalimide |
| |
| DOI： |
| 中文关键词: 生物柴油 邻苯二甲酰亚胺钾 甘油三酯 均相反应 非均相分离 |
| 英文关键词:biodiesel potassium phthalimide triglyceride homogeneous reaction heterogeneous separation |
| 基金项目: |
|
| Hits: 931 |
| Download times: 706 |
| 中文摘要: |
| 针对酯交换法合成生物柴油中均相催化剂不容易分离和非均相催化剂易失活和用量大等问题，提出用邻苯二甲酰亚胺钾催化大豆油和甲醇合成生物柴油。通过单因素实验考察了催化剂邻苯二甲酰亚胺钾用量、醇油摩尔比、反应温度和反应时间对甘油三酯转化率的影响，并利用Design-Expert软件通过响应面实验对合成反应条件进行了优化。考察了邻苯二甲酰亚胺钾在甘油和甲醇中的溶解度和作为催化剂的重复使用性能。通过红外光谱和气相色谱-质谱对生物柴油的结构和组成进行了分析。结果表明：合成生物柴油的最佳反应条件为反应温度60℃、醇油摩尔比7.15∶1、反应时间2.4 h、催化剂用量1.2%，在此条件下甘油三酯转化率为96.0%；催化剂在高温下溶于甲醇和甘油，在低温下可在甘油中析出；催化剂循环使用4次，甘油三酯转化率仍在85%以上；红外光谱和气相色谱-质谱分析表明，生物柴油被成功合成，棕榈酸甲酯、油酸甲酯、亚油酸甲酯和硬脂酸甲酯含量为83.09%。综上，邻苯二甲酰亚胺钾作为合成生物柴油的催化剂，具有较高的催化性能和较好的重复使用性，可以实现均相酯交换反应和非均相分离。 |
| 英文摘要: |
| In order to solve the problems in biodiesel synthesis by transesterification, such as difficult separation of homogeneous catalysts, and easy deactivation and large dosage of heterogeneous catalysts, potassium phthalimide was proposed to catalyze the synthesis of biodiesel from soybean oil and methanol. The effects of catalyst dosage, molar ratio of methanol to oil, reaction temperature and reaction time on triglyceride conversion were investigated by single factor experiment, and then the response surface experiment was carried to optimize the synthesis conditions of biodiesel by Design-Expert software. The solubility of potassium phthalimide in glycerol and methanol and its reusability as a catalyst were investigated. The structure and composition of biodiesel synthesized were analyzed by infrared spectroscopy and gas chromatography-mass spectrometry. The results showed that the optimal reaction conditions for the synthesis of biodiesel were obtained as follows: reaction temperature 60℃, molar ratio of methanol to oil 7.15∶1, reaction time 2.4 h, and catalyst dosage 1.2%. Under these conditions, the triglyceride conversion was 96.0%. The catalyst potassium phthalimide was soluble in methanol and glycerol at high temperature, and could be precipitated in glycerol at low temperature. The catalyst was recycled four times and the triglyceride conversion was still above 85%. Infrared spectroscopy and gas chromatography-mass spectrometry analysis showed that biodiesel was successfully synthesized with 83.09% of methyl palmitate, methyl oleate, methyl linoleate and methyl stearate. In conclusion, potassium phthalimide as a catalyst for the synthesis of biodiesel has high catalytic performance and good reusability,and can realize homogeneous transesterification and heterogeneous separation. |
| 查看全文 View/Add Comment Download reader |
| Close |
|
|
|
