以共沉淀法合成的La_(2)O_(3)-CuO-MgO三元复合固体碱为催化剂,用于异丙苯(IPB)氧化工艺中。由于氧化过程受过氧化氢异丙苯(CHP)分解的影响,IPB转化率与CHP选择性呈折衷关系。在单因素实验研究的基础上对IPB氧化合成CHP的工艺进行正交优...以共沉淀法合成的La_(2)O_(3)-CuO-MgO三元复合固体碱为催化剂,用于异丙苯(IPB)氧化工艺中。由于氧化过程受过氧化氢异丙苯(CHP)分解的影响,IPB转化率与CHP选择性呈折衷关系。在单因素实验研究的基础上对IPB氧化合成CHP的工艺进行正交优化,考察了各因素对IPB转化率及CHP选择性及收率的影响。结果表明,在反应时间为8.5 h、反应温度为100℃、VO_(2)为500 m L/min及催化剂质量分数为2.0%的优化条件下,IPB的转化率为95.50%,CHP的选择性与收率分别为60.57%、57.84%。展开更多
A separation integrated technology for isolating refined solanesol from tobacco extracts was provided. Some experimental installations applied in the separation integrated technology were designed. The experimental in...A separation integrated technology for isolating refined solanesol from tobacco extracts was provided. Some experimental installations applied in the separation integrated technology were designed. The experimental installations included saponification and extraction installation, cryogenic centrifugation crystallization installation and continuous midium pressure column chromatography separation installation In the paper, a separation integrated technology route was designed: saponification and extraction-crystallization - silica gel column chromatography-recrystallization. Finally, refined solanesol (-95.5%) was successfully got. The new method featured shorter experimental times, as well as lower solvent consumption, compared with the conventional extraction methods. So it showed great potential for efficient sample preparation and large-scale industrial application in the near future.展开更多
文摘以共沉淀法合成的La_(2)O_(3)-CuO-MgO三元复合固体碱为催化剂,用于异丙苯(IPB)氧化工艺中。由于氧化过程受过氧化氢异丙苯(CHP)分解的影响,IPB转化率与CHP选择性呈折衷关系。在单因素实验研究的基础上对IPB氧化合成CHP的工艺进行正交优化,考察了各因素对IPB转化率及CHP选择性及收率的影响。结果表明,在反应时间为8.5 h、反应温度为100℃、VO_(2)为500 m L/min及催化剂质量分数为2.0%的优化条件下,IPB的转化率为95.50%,CHP的选择性与收率分别为60.57%、57.84%。
文摘A separation integrated technology for isolating refined solanesol from tobacco extracts was provided. Some experimental installations applied in the separation integrated technology were designed. The experimental installations included saponification and extraction installation, cryogenic centrifugation crystallization installation and continuous midium pressure column chromatography separation installation In the paper, a separation integrated technology route was designed: saponification and extraction-crystallization - silica gel column chromatography-recrystallization. Finally, refined solanesol (-95.5%) was successfully got. The new method featured shorter experimental times, as well as lower solvent consumption, compared with the conventional extraction methods. So it showed great potential for efficient sample preparation and large-scale industrial application in the near future.