共查询到19条相似文献,搜索用时 93 毫秒
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超临界流体萃取技术及其应用 总被引:10,自引:0,他引:10
介绍了超临界流体萃取技术及其萃取基本原理,分析了超临界流体萃取技术(SFE)与传统萃取方法相比具备的优点,概述了国内外SFE技术在医药,食品、香料,石油化工以及环境保护领域的开发及应用。 相似文献
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烟碱分离技术研究进展 总被引:5,自引:0,他引:5
综述了超临界萃取(Supercritical Fluid Exlraction,简称SFE)和膜分离技术在烟碱提取中的一些应用及有关数学模型的建立, 相似文献
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一种新的绿色化学技术:超临界萃取作为样品制备技术在痕量药检分析中的应用 总被引:3,自引:0,他引:3
综述了超临界萃取作为样品制备技术在痕量药检分析中的应用.研究了生物基质对有效萃取目标检测物的影响及提高萃取率的途径.并重点评述了减少类脂杂质、选择性的分离目标检测物的非在线吸附剂收集与在线吸附剂收集技术.从而展示了SFE作为绿色化学技术具有萃取率高、使用溶剂少,分离步骤少,环境无害等明显优于传统方法的特点. 相似文献
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本文介绍了化工生产中“萃取”操作单元的新技术--超临界流体萃取(SFE)在植物的提取,石油及有机水溶液的分离等方面的应用。 相似文献
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目的优化白鲜皮超临界流体萃取(SFE)工艺并进行抗氧化研究。方法根据Central Composite的中心组合实验设计原理,在单因素试验基础上,采用三因素三水平的响应面分析法,建立SFE的二次多项式数学模型,并以白鲜皮提取率为响应值作响应面和等高线,考察萃取压力、萃取温度和时间对白鲜皮提取率的影响。利用DPPH自由基清除法检测提取物的抗氧化活性。结果 SFE的最优工艺参数为:萃取压力3.71×10~7Pa,萃取温度67℃,萃取时间32min。此条件下提取率可达1.50%。白鲜皮萃取物对DPPH自由基清除能力具有浓度依赖性,IC50=3.79mg·m L~(-1)。结论建立SFE萃取白鲜皮的最优条件。确定白鲜皮SFE萃取物有一定的抗氧化活性。 相似文献
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超临界流体萃取强化技术及应用 总被引:16,自引:0,他引:16
超临界流体萃取技术是近代分离技术中出现的最新学科 ,由于其和传统萃取方法相比具有很多优势 ,近年来发展迅速。但其本身也存在着一些问题如操作压力大、萃取时间较长 ,对设备的要求高 ,能耗相对也大 ,提取能力小 ,萃取率有待进一步提高 ,从而限制了其应用领域的进一步拓展和大范围地转化为工业化生产。采用夹带剂、超声场或电场等技术强化超临界流体萃取过程 ,可有效地提高萃取率 ,降低操作压力等 ,因而成为人们研究的一个新动向 ,也将对超临界流体萃取技术产生重要的影响。对这些强化技术及应用进行论述 ,并提出了所存在的问题和研究方向 相似文献
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Juliana M. PradoGlaucia H.C. Prado M. Angela A. Meireles 《The Journal of Supercritical Fluids》2011,56(3):231-237
Many scale-up criteria for supercritical fluid extraction (SFE) can be found in literature. However, the studies are often divergent and inconclusive; therefore, more studies on this field are needed. The objective of the present work was to study the scale-up of SFE process focusing application to Brazilian raw materials. A laboratory scale equipment (290 mL extraction vessel) and a pilot scale equipment (5.15 L extraction vessel) were used to study scale-up of SFE for clove and sugarcane residue. The scale-up criterion adopted consisted in maintaining solvent mass to feed mass ratio constant. The criterion was successfully used for a 15-fold scale-up of overall extraction curves for both raw materials studied; yields in pilot scale were slightly higher than in laboratory scale. The criterion studied allows a rapid and simple scale-up procedure, which can be very useful for the purpose of developing SFE technology at industrial scale in developing countries where such technology is still not available at industrial level. 相似文献
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超临界CO2萃取技术在中药有效成分提取中的应用 总被引:5,自引:0,他引:5
超临界流体萃取技术是一种新型高效分离技术,也是中药现代化的关键技术之一。简要介绍了超临界CO2萃取技术的基本原理、特点及其在中药有效成分提取中的应用。 相似文献
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Review of kinetic models for supercritical fluid extraction 总被引:1,自引:0,他引:1
Eduardo L.G. OliveiraArmando J.D. Silvestre Carlos M. Silva 《Chemical Engineering Research and Design》2011,89(7):1104-1117
The supercritical fluid extraction (SFE) of liquids and solid materials is gaining increasing interest and commercial application in last decades, most particularly under the recent concept of green chemistry and biorefinery. Hence, it is fundamental to provide adequate modeling of the SFE, in order to optimize operating conditions and simulate the global process. This work intends to review the most significant and physically sound models published in the literature for countercurrent liquid-supercritical fluid extraction and SFE of solid matrices, such as the linear driving force, shrinking core, broken and intact cells, and the combination of BIC and shrinking core models. The main assumptions and mass transfer expressions are presented and discussed. 相似文献
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以八角茴香果为原料,比较了超临界CO2流体萃取法(SFE)和水蒸气蒸馏法(SD)对八角茴香油的提取率和香气性能的影响。用正交设计方法,确定了超临界CO2流体萃取八角茴香油的最佳条件为:萃取压力13.8MPa,萃取温度40℃,萃取时间2 h。在该条件下,八角茴香油的萃取率为2.88%。相同的萃取条件下,用水蒸气蒸馏技术提取八角茴香油,精油萃取率为1.39%。通过气味指纹分析仪(电子鼻)检测和气味感官评定,对两种提取方法得到的八角茴香油的香气性能进行了比较,用SFE法所得八角茴香油的质量比SD法所得精油有明显改善,香气更完全,更具新鲜感和天然感。 相似文献
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Supercritical Fluid Extraction, Microwave Assisted Extraction and Soxhlet Extraction for the Analysis of PCB's in Soil and Sewage Sludge The supercritical fluid extraction (SFE) was applied on the analysis of PCB's in soil and sewage sludge. Some questions concerning the performance of SFE were studied. With spiked samples and the modifier toluene put directly onto the sample the effect of a static extraction before the dynamic extraction step is described. It was found that matrices with a high content of total organic carbon show matrix effects in SFE, which was identified by calibration of the whole analytical process and eliminated by repeating the extraction. Two real samples were used to compare the SFE with soxhlet extraction and organic solvent extraction by means of microwave energy. The extracts were cleaned by column chromatography on aluminium oxide and silica gel modified with silver nitrate and afterwards analysed by GC-ECD and GC-MS (SIM mode). Soxhlet and SFE gave comparable results. The best extraction results were achieved by microwave assisted extraction with a solvent mixture of hexane/acetone 3:1. 相似文献