超临界CO_2萃取葡萄籽油的研究

本文对超临界二氧化碳萃取葡萄籽油进行了研究。以物料的粒度、萃取温度、压力、静态萃取时间、动态萃取时间为考察指标,通过正交实验研究了不同的萃取条件对葡萄籽油产率的影响,确立了最佳的工艺条件为:物料粒度40目,在35℃,50 MP,静态萃取0 min,动态萃取60 min。     

超临界二氧化碳萃取红花籽油的研究

以红花籽为原料、超临界CO2为溶剂,采用半连续流程萃取红花籽油,在操作压力为20~28 MPa、温度为308~323 K、萃取时间为0~4 h的条件下,考察了各因素对红花籽油萃取的影响。结果表明,当压力从20 MPa提高到28 MPa时,萃取量提高近一倍;随着萃取温度的升高,萃取量出现最高值;在合适的萃取压力和温度下,萃取2 h接近完全。气相色谱分析表明,红花籽油的主要成分得到有效富集,亚油酸、不饱和脂肪酸的含量分别为79.16%和91.37%。     

超临界二氧化碳萃取蛋黄油实验研究

介绍了超临界二氧化碳萃取技术提取蛋黄洫的工作原理及工艺流程。设计了正交实验.考察萃取压力、萃取温度、萃取时间等参数对萃取率的影响,确定了最佳工艺条件。     

超临界二氧化碳萃取蛋黄油的研究

采用超临界萃取方法,以二氧化碳作为溶剂,在比较温和的实验条件下,从蛋黄粉中萃取蛋黄油。实验条件为：温度３５℃～７５℃,压力２５ＭＰａ～３６ＭＰａ,ＣＯ２的流量约７．０ｋｇ／ｈ。实验得到最佳的萃取条件为：５５℃、２８ＭＰａ～３６ＭＰａ。气相色谱分析结果表明：在不同的萃取阶段蛋黄油的组成类似。并且得到了不同实验条件下蛋黄油在超临界二氧化碳中的溶解度     

超临界二氧化碳萃取蛋黄油实验研究

介绍超临界二氧化碳萃取技术提取蛋黄油的工作原理及工艺流程.设计了正交实验,考察了萃取压力、萃取温度、萃取时间等参数对萃取率的影响,确定了最佧工艺条件.     

石菖蒲挥发油的超临界CO2萃取工艺研究

考察了萃取压力、萃取温度、工作流量和时间等因素对超临界CO2萃取石菖蒲挥发油的影响.分别以萃取得到的挥发油得率、挥发油中α-细辛醚含量及α-细辛醚萃取率为指标,通过单因素试验获得石菖蒲挥发油超临界萃取的最佳工艺条件以及最佳萃取结果,即得油率4.86%,α-细辛醚含量3.17%,α-细辛醚萃取率1.26×10-3,同时也与水蒸气蒸馏方法进行了比较,结果表明超临界CO2萃取石菖蒲挥发油中α-细辛醚的含量要稍低于水蒸气蒸馏法,但其得油率及α-细辛醚的萃取率要明显优于传统的水蒸气蒸馏法.     

Experimental Modeling and Simulation of Supercritical Fluid Extraction of Moringa oleifera Seed Oil by Carbon Dioxide

Moringa oleifera seed is an important source of high oleic acid in vegetable oil. In the present work, supercritical extraction of Moringa seed oil has been carried out to study the influence of operating temperature, pressure, particle size, carbon dioxide flow rate, and co-solvent addition by performing experiments in the range of 333–373?K, 20–40?MPa, 0.50–1.00?mm, 0.83?×?10^?4–2.50?×?10^?4?kg/s, and 0–10% ethanol. The extraction data have been successfully modeled by extended Lack’s model and fitting parameters are optimized by the Box global optimization technique. The results showed that pressure has a significant effect followed by temperature, co-solvent, solvent flow rate, and particle size.     

萃取八角茴香精油的研究

用超临界CO₂萃取八角茴香精油。采用4因素4水平的正交试验,得出超临界CO₂萃取八角茴香精油的最佳工艺条件为:压力16 MPa、温度35℃、时间2 h、CO₂流量30 L/h。在此条件下,八角茴香萃取物得率为10.5%。采用水蒸气蒸馏提取精油,得率为7.5%。对两种不同提取方法得到的精油的品质和得率进行了比较。超临界CO₂萃取方法得到的八角茴香精油产品得率比水蒸气法高出40%,并且香气更全面。     

超临界二氧化碳萃取在石油工业中的应用探究

随着化工工程的发展,超临界技术得以发展并被广泛的应用到了各个领域之中,尤其是石油化工行业。二氧化碳、乙醇、丙烯等气体都可作为流体萃取的溶剂,而在石油工业中,二氧化碳萃取具有独特的优势。对以二氧化碳为溶剂的超临界流体萃取技术在石油工业中的应用情况进行分析与探究。     

超临界二氧化碳萃取亚麻籽油的研究

采用半连续流程 ,以亚麻籽为原料、超临界CO2 为溶剂萃取亚麻籽油。通过对不同操作压力、温度、时间、CO2 流量条件下萃取曲线平衡段的直线拟和得到亚麻籽油在超临界CO2 中的溶解度 ,并回归了Chrastil方程的参数 ,得到计算亚麻籽油在超临界CO2 中的溶解度的方程。将萃取过程考虑为CO2 通过亚麻籽固定床的模型 ,由Stastova提出的传质方程对不同压力、温度、CO2 流量下的萃取过程进行模拟 ,并分析了传质系数在不同操作条件下的变化     

超临界CO_2萃取芹菜籽油研究

用超临界ＣＯ２萃取技术对广东白芹菜籽进行了萃取研究。结果表明，萃取压力低于１５ＭＰａ时，较重的油树脂等成分难以被萃取出来；萃取温度为３０８Ｋ时对萃取最有利；解析温度对萃取效率影响较小；ＣＯ２流量对萃取效率的影响比床层高度引起的扩散阻力的影响大得多。超临界ＣＯ２萃取所得芹菜籽油品质优越，且其中的药用有效成分（３－正丁基－４，５－二氢苯并呋喃酮）含量比水汽法所得芹菜籽油的高五倍多。     

超临界二氧化碳萃取在石油工业中的应用

近年来,超临界二氧化碳萃取技术作为分析化学中一种新兴技术,迅速显示了其特有的效果和广泛的运用前景。文章介绍了超临界二氧化碳萃取的原理和特性,重点阐述其在油气开采和石油炼制研究领域的进展状况,并指出了该技术的发展方向。     

Oxidative Stability of Papaya Seed Oil From Hainan/Eksotika Obtained by Subcritical and Supercritical Carbon Dioxide Extraction

Papaya seed is a good source of edible oil with considerable antioxidant activity. Here, papaya seed oil (PSO) of Hainan/Eksotika variety was obtained by subcritical butane extraction (SBE) and supercritical carbon dioxide extraction (SCDE), and its yields, physicochemical properties, oxidative and thermal stability, and chemical and microscopic structures were compared. The results showed that SBE‐PSO had a higher yield (25.88 ± 0.29% vs. 19.47 ± 0.92%), but a lower melting point compared to SCDE‐PSO. Molecular structures indicated that there was no oxidative degradation during SBE and SCDE. Both SBE and SCDE caused significant structural changes of seed tissues. In addition, aldehyde composition analysis using high performance liquid chromatography (HPLC) showed that SBE‐PSO had fewer octanal, nonanal, 2‐decenal, and 2‐undecenal contents than SCDE‐PSO. All these results proved that SBE‐PSO exhibited superiority on the oxidative stability compared to SCDE‐PSO. It indicated that SBE was a superior method to obtain antioxidant edible oil with good stability.     

超临界二氧化碳萃取技术

超临界流体萃取(Supercritical Fluid Extraction)技术是一种新型的化工分离技术.本文综述了超临界流体萃取技术的发展.超临界流体的特性,介绍了超临界二氧化碳萃取技术在中草药,食品工业,香料工业和环保技术方面的应用,并对超临界二氧化碳萃取技术的现状和前景进行了分析.     

超临界二氧化碳流体萃取分离技术

超临界流体的扩散系数比一般液体的扩散系数高一个数量级,而粘度要低一个数量级。与液-液萃取系统相比,超临界流体萃取系统具有较快的传质和萃取速度,因此能有效地对固体样品进行萃取分离。常用的超临界流体有乙烯、氙气、一氯三氟乙烷、二氧化碳、乙烷、一氧化二氮、一氟甲烷、丙烷、氨等,应用领域也从早期的天然香料提取扩展到食品、环境保护、农药、烟草、中药等行业,超临界萃取技术越来越受到国际科技届的广泛关注。但该技术应用于工业化生产尚需一定时日,还需要进一步降低操作成本和设备的造价。     

超临界二氧化碳萃取茵陈挥发油的实验研究

对超临界二氧化碳萃取茵陈挥发油和水蒸汽蒸馏法进行了研究对比,结果显示超临界二氧化碳的萃取率明显大于水蒸汽蒸馏法.并用正交试验法进行超临界二氧化碳萃取实验,得出在实验范围内的最佳条件为:萃取压力15 MPa,萃取温度50 ℃,二氧化碳流量20 L*h-1,在此条件下,挥发油的收率为0.708%.     

超临界CO2萃取小麦胚芽油研究

用超临界ＣＯ２萃取技术对小麦胚芽和成品麦胚进行了萃取研究。结果表明,最佳工艺条件为萃取压力２５．０ＭＰａ,萃取温度３２℃,用气楷７．６１ＮＭ＾３ｋｇ．ｈ．所得的麦胚油品质优越,且其中的维生素Ｅ含量比溶剂法,压榨法所得麦油高。本研究为麦胚油的超临界萃取实现工业化生产提供设计参数。     

Extraction of Organic Oil from Sea Buckthorn Seeds with Supercritical Carbon Dioxide

The extraction of fatty acids and their derivatives from sea buckthorn seeds with supercritical carbon dioxide is experimentally studied. A theoretical model of supercritical extraction of organic oil is constructed. The thermodynamics of dissolution of high-molecular-weight substances under supercritical conditions is described in terms of the Redlich–Kwong equation of state. The diffusion of macromolecules of substances contained in organic oil in seed pores is described using a model of a contracting core. The calculated results are compared to experimental data. The pseudocritical parameters of organic oil and its saturation vapor pressure are estimated.     

Physical Properties of Butter Oil Fractions Obtained by Supercritical Carbon Dioxide Extraction

Butter oil has been fractionated with supercritical carbon dioxide at 40°C. 125 bar and 350 bar, respectively. The chemical composition and physical properties of the butter oil fractions have been studied with gas chromatography and differential scanning calorimetry (DSC). The polymorphism of the fractions has been studied by X-ray diffraction during crystallization. Fractionation carried out at lower extraction pressure results in higher selectivity. The first fractions collected during the extraction process contain triglycerides which are enriched in short chain fatty acids. The colourless fractions melt and crystallize at a lower temperature compared to the original butter. The residual fraction is enriched in triglycerides with long chain fatty acids, is yellow, melts and crystallizes at a higher temperature. All the investigated fractions shows the β′ form when crystallized from the melt.