Evaluation of Supercritical Fluid Extraction Model Parameters by Monte-Carlo Methods

Theoretical Foundations of Chemical Engineering - The problem of evaluation of model parameters for supercritical fluid extraction of oil from ground plant materials with high initial oil contents...     

二氧化碳超临界萃取法提取核桃中油酸研究

利用二氧化碳超临界萃取法(Supercritical Fluid Extraction,简称SFE)对陇东核桃中的脂肪酸进行了提取研究,并采用气相色谱-质谱联用仪(GC-MS)对所得的脂肪酸组成进行了分析,实验结果表明:萃取压力20 MPa、温度40℃、CO_2泵频率20 L/h,萃取时间4 h时核桃油酸的萃取率高,无杂质残留,感官效果好。     

Concentrating Glycerol Mixed with Fatty Acids and Water by Supercritical Fluid Extraction

The binary solubilities of palmitic acid, stearic acid, oleic acid, and water in carbon dioxide under supercritical conditions were calculated by the Soave equation of state with empirical intermolecular interaction parameters. It was demonstrated that supercritical fluid extraction can be used for concentrating glycerol in raffinate and for separating fatty acids. Both batch and circulation extraction techniques were tested in concentrating glycerol.     

Supercritical Fluid Extraction of Triglycerides

Abstract

The demand for natural products has resulted in considerable interest in supercritical fluid (SCF) technology. The advantages of using SCFs as extraction solvents have been well documented. The ease of solute-solvent separation, low toxicity, and the ability to vary the solvent power make the use of SCFs attractive to the food industry, in particular in the area of triglyceride extraction. Recent material published has been primarily concerned with triglyceride extraction using supercritical (SC) carbon dioxide. The data published suggests limited solubilities (1–3 wt%) with the operating pressures in the vicinity of 300–500 bar, which will entail high capital and operating costs. Investigations carried out using SC propane as a solvent have indicated substantially higher loadings at much lower pressures. This is attributed to the similar chemical nature of the solute and the solvent. It is anticipated that triglycerides can be fractionated using SC propane on the basis of chain length and degree of unsaturation. In this paper the potential of using SC propane as a solvent for the extraction of triglycerides is discussed.     

超临界流体萃取法综述

对超临界流体萃取技术及其应用研究进行了综述。     

Kinetics of Supercritical Fluid Extraction

Theoretical Foundations of Chemical Engineering -     

超临界CO_2流体萃取枇杷叶中熊果苷的工艺研究

采用超临界CO2流体萃取枇杷叶中的熊果苷,并用紫外可见分光光度法测定萃取物中熊果苷含量;在单因素实验的基础上,通过L9（34）正交试验对萃取条件进行优化,确定最佳工艺参数为：萃取温度55℃,萃取压力20 MPa,携带剂用量75 mL,萃取时间30 min。在此工艺条件下萃取得到的产物杂质含量少,产品纯度高,结果重现性良好;工艺参数在现有工业条件下容易实现,具有可行性。     

超临界CO2萃取黄酮类物质的研究进展

介绍了超临界流体萃取(SFE)黄酮类物质的研究现状，总结了影响萃取的因素，并对未来的发展趋势作了展望。     

Supercritical Carbon Dioxide Extraction of Marigold Lutein Fatty Acid Esters: Effects of Cosolvents and Saponification Conditions

Extraction of lutein fatty acid esters from marigold flower using supercritical carbon dioxide (SC-CO₂) with cosolvent was investigated. Without the cosolvent, the total xanthophylls yield increased with increasing temperature and pressure of SC-CO₂, and the optimal condition was found to be at 60°C and 40 MPa. At this condition, the highest total xanthophylls percent recovery was 74.4 ± 0.9%. Palm oil was found to be a more efficient cosolvent than soybean oil, olive oil, and ethanol, resulting in a 16% increase in the total xanthophylls recovery to 87.2 ± 4.4% when 10% (w/w) of palm oil was used. Furthermore, saponification of the oleoresin for 3 h at 75°C with 40% w/v KOH solution at the oleoresin to solution ratio of 1 g to 2 ml was found to suitably convert lutein fatty acid esters into free lutein.     

超临界萃取技术的应用研究进展

超临界流体萃取技术开辟了分离工业的新领域,是一种新型的分离技术。综述了超临界萃取技术的研究进展,介绍了超临界萃取技术在金属离子、香料化妆品、天然中草药、石油加工、保健食品等方面的应用和研究进展,提出了超临界萃取技术新的研究领域,随着研究工作的不断深入,更加理想萃取剂的发现,必将使超临界萃取技术的应用前景更加广阔。     

超临界流体萃取技术的应用

介绍了超临界CO2萃取技术的优点及使用的改性剂,对超临界流体萃取技术在医药工业、食品工业、环境保护中的应用进行了详细阐述,指出应加快超临界流体萃取技术应用的产业化步伐。     

超临界流体萃取大豆磷脂的研究

建立了一套超临界流体萃取小试装置,从大豆粉中提取精制大豆磷脂,并分别探讨了压力、温度、时间、夹带剂比例、大豆粉粒度等因素对萃取收率及质量的影响。得出最佳反应条件：压力20MPa,温度55℃．时间90min,流量15L／min,使用高效液相色谱(HPLC)测定收率。     

褐煤的超临界流体萃取研究

以我国云南和东蒙地区褐煤为原料，在半连续超临界萃取装置上研究了它们的萃取特性。     

离子对/SC-CO2萃取技术进展

介绍了离子对/SC-CO2萃取的基本原理,分析了离子对/SC-CO2萃取的影响因素,讨论了其在萃取中的具体应用并提出了展望.     

番木瓜籽油的超临界萃取工艺及其脂肪酸组成分析

以番木瓜籽油的萃取得率为指标,采用正交试验,考察萃取压力、温度和时间对萃取得率的影响,对超临界CO2流体萃取番木瓜籽油的工艺条件进行优选,并采用气质联用对其脂肪酸组成进行分析。结果,番木瓜籽油超临界萃取的较佳条件为:萃取压力为25 MPa,萃取温度为55℃,萃取时间为120 min;在此条件下,番木瓜籽油的平均萃取得率为30.0%,油中的主要脂肪酸为油酸(50.37%)、棕榈酸(19.61%)、亚油酸(5.91%)和硬脂酸(5.28%)。     

超临界流体萃取三氟氯氰菊酯及甲氰菊酯残留条件研究

应用超临界流体萃取技术,建立了三氟氯氰菊酯及甲氰菊酯的萃取分离及GC检测方法。在压力5000psi、温度45℃、改性剂甲醇添加量0．04ml／g、静态萃取时间20min、CO2流量25ml,收集溶剂甲醇条件下,利用ECD检测器,在柱温80℃,检测器及进样口温度260℃,升温速率80℃恒温5min,以10℃／min程序升温,260℃恒温12min,进样量1ml,载气7psi,衰减8,补偿气47ml／min下测得三氟氯氰菊酯及甲氰菊酯的萃取率分别为98．46％和99．47％;保留时间分别为24．29min、23．14min。     

超临界流体萃取技术及其应用

超临界流体萃取开辟了分馏过程的新领域,是一种新型的分离技术。主要介绍了超临界流体萃取的基本原理、典型流程、特点及其在化工过程中的应用。     

超临界流体萃取技术的发展及应用

超临界流体萃取技术(Supercritical fluid extraction technology,简称:SFE)是利用流体在超临界状态下具有选择性溶解能力的特性对不同的物料进行分离。超临界流体萃取技术在天然有机物质的提取方面有着巨大的优势。随着现代化工业工程技术的发展,超临界流体萃取技术在食品、石油、化工、医药等各个领域显示出广阔的发展前景。     

Identification of Bioactivity,Volatile and Fatty Acid Profile in Supercritical Fluid Extracts of Mexican arnica

Supercritical fluid extraction (SFE) is a sustainable technique used for the extraction of lipophilic metabolites such as pigments and fatty acids. Arnica plant is considered a potential candidate material with high antioxidant and antimicrobial activities. Therefore, in this study, a locally available Heterotheca inuloides, also known as Mexican arnica, was analyzed for the extraction of high-value compounds. Based on different pressure (P), temperature (T), and co-solvent (CoS), four treatments (T) were prepared. A maximum 7.13% yield was recovered from T2 (T = 60 °C, P = 10 MPa, CoS = 8 g/min), followed by 6.69% from T4 (T = 60 °C, P = 30 MPa, CoS = 4 g/min). Some bioactive sesquiterpenoids such as 7-hydroxycadalene, caryophyllene and δ-cadinene were identified in the extracts by GC/MS. The fatty acid profile revealed that the main components were palmitic acid (C16:0), followed by linoleic acid (C18:2ω6c), α-linolenic acid (C18:3ω3) and stearic acid (C18:0) differing in percent yield per treatment. Antibacterial activities were determined by the agar diffusion method, indicating that all the treatments exerted strong antibacterial activity against S. aureus, C. albicans, and E. coli strains. The antioxidant capacity of the extracts was also measured by three in vitro assays, DPPH, TEAC and FRAP, using Trolox as a standard. Results showed high antioxidant capacity enabling pharmaceutical applications of Mexican arnica.     

超临界流体萃取技术及其在农药残留分析研究中的应用

介绍了超临界流体萃取技术的原理、性质,综述了超临界流体萃取技术在农药残留研究中的应用,并对该技术的发展前景作了展望。