超临界CO_2萃取辣椒油的工艺条件优化研究

以三峡库区种植的辣椒为原料,采用超临界CO2萃取技术,从辣椒中提取辣椒油,考察了萃取温度、萃取压力和萃取时间对辣椒油萃取率的影响。结果表明,萃取温度对辣椒油的萃取率影响最大,其次是萃取压力,萃取时间影响最小;超临界CO2萃取辣椒油的最适宜条件为,萃取温度40℃,萃取压力10 MPa,时间75 min,其萃取率为9.37%;超临界CO2萃取技术应用于辣椒油的提取具有工艺简单、操作安全、能耗低、无毒、萃取剂易回收、萃取率和产品纯度高等优点。     

超临界CO_2萃取辣椒油实验研究

研究了利用超临界CO2为萃取剂,从辣椒中萃取分离辣椒油的工艺。考察了萃取压力、萃取温度、辣椒原料颗粒大小以及CO2流量等因素对辣椒油萃取率的影响。结果表明,最佳工艺参数为:压力22 MPa,CO2流量0.3~0.4 m3/h,颗粒度30~50目,温度315 K。超临界萃取法具有工艺简单、操作安全、产品无溶剂残留、提取率高等优点。     

超临界CO2流体萃取莪术挥发油的工艺研究

利用超临界CO2流体萃取技术,以榄香烯为目标物,研究了萃取压力、温度、时间、原料粒度和CO2流量对莪术挥发油萃取率的影响,建立了获得莪术挥发油的最佳工艺条件.实验结果表明,莪术粉粒度40目,萃取压力18 MPa,温度50℃,萃取时间120 min,流量20～30 kg/h条件下,挥发油中榄香烯含量最高,相对含量为2.8%,为以后精馏研究奠定了基础.     

超临界CO2流体萃取蚕蛹油研究

在8kg.h-1CO2流量下探讨了蚕蛹油的超临界CO2萃取。在单因素实验的基础上通过正交实验确定了蚕蛹油的较佳萃取条件。实验结果表明,萃取温度对蚕蛹油得率影响较大,其次是萃取时间、萃取压力。超临界CO2萃取蚕蛹油的较优条件为:温度50℃,压力25MPa,时间2.5h,在上述条件下蚕蛹油得率为29.45%。     

数值模拟在超临界二氧化碳萃取辣椒油中的应用

建立了一套超临界流体萃取实验装置,研究了用超临界二氧化碳萃取辣椒油的实验条件。考 察了萃取压力、萃取温度、原料颗粒大小以及二氧化碳流量对萃取率的影响。基于萃取器单元的质量守 恒原理建立了微分方程,对一定萃取条件下的实验结果进行了数值模拟。     

含夹带剂超临界CO2萃取芝麻油

利用含夹带剂超临界CO2从芝麻中萃取了芝麻油,实验研究了萃取压力、温度、时间、CO2流量等工艺条件因素对萃取率的影响。研究结果表明:萃取率随着压力升高而升高;温度在45℃以下时,萃取率随着温度对升高而升高,但当温度超过45℃以后,萃取率略有下降;萃取率随着时间的增加而增加,但随着时间的延长,萃取率的增加幅度逐渐变缓;随CO2流量增大,萃取率上升。得到超临界CO2流体萃取芝麻油的较优工艺条件为:萃取压力为30 MPa、萃取温度45℃、萃取时间180 min、CO2流量10 kg/h。     

不同夹带剂条件下超临界CO2萃取蜂胶黄酮的研究

以蜂胶为原料,进行超临界CO2萃取蜂胶黄酮的研究,系统地考察了醇系、酮系、酯系和混合溶剂等夹带剂对蜂胶黄酮含量的影响。实验表明:夹带剂对萃取影响关系为:醇系夹带剂>混和夹带剂>酯系夹带剂>酮系夹带剂>不加夹带剂。95%乙醇是性价比最高的夹带剂,夹带剂用量为10%。     

超临界CO2—共轭亚油酸乙酯萃取体系研究

利用带有视窗的相平衡装置对共轭亚油酸乙酯在超临界CO2中的溶解度进行了测定。并通过对相平衡釜内体系相态变化的观测,进一步研究超临界相行为。采用Chrastil经验方程对共轭亚油酸乙酯在超临界CO2中的溶解度进行模拟。共轭亚油酸乙酯体系计算值与实验值平均误差为2.43%。     

超临界CO2萃取单宁酸的研究

研究了从五倍子原料中超临界CO2萃取单宁酸的方法,通过对影响萃取的各种因素的实验,得出了优选的超临界CO2萃取条件为萃取温度为44℃、压力为25 MPa、夹带剂为乙酸乙酯,萃取120 min效果最佳,得率为57.83%.经测定,萃取得到的单宁酸含量大于96%,本研究为制备高纯度单宁酸提供了一条新的途径.     

超临界CO2萃取工艺的研究

超临界ＣＯ２萃取是利用ＣＯ２作溶剂的一种新型的分离,广泛应用于天然产物的提取,本文介绍了这种技术的原理及应用范围,通过对ＣＯ２物性的分析,阐述了如何对整个工艺过程进行控制及过程中的热力计算。     

超临界CO2萃取胡椒油实验研究与数值模拟

建立了超临界流体萃取胡椒油实验装置,以CO2为萃取剂,考察了萃取压力、温度、CO2流量及原料颗粒大小等因素对胡椒油萃取率的影响,并由此确定了较佳的萃取工艺条件:压力22—26 MPa,温度313—323 K,胡椒颗粒度30—40目,CO2流量0.3—0.4 m3/h,胡椒油累积萃取率可达80%—90%。基于萃取器微分单元和固态原料颗粒微分单元质量守恒原理,建立了微分方程,利用直线推动力近似理论拟合总传质推动力及平衡吸收常数,化简方程,对实验结果进行了数值模拟。     

超临界CO2流体萃取中的在线检测技术

综述了超临界CO2流体萃取中的在线检测技术,介绍了超临界CO2流体萃取与超临界流体色谱、气相色谱、高效液相色谱、核磁共振、近红外光谱等技术的联用在线检测,阐述了在线检测技术的优越性,提出了如何发展超临界CO2流体萃取中的在线检测技术。     

超临界CO_2流体萃取植物油的实验研究

建立了一套超临界流体萃取实验装置,就大豆和花生两种植物油超临界流体萃取进行了较为详细的实验研究.在探讨了压力、温度、颗粒度、空隙率以及时间等对萃取率的影响之后,获得了指导实际生产的最佳工艺参数条件.     

超临界CO2萃取万寿菊籽油的工艺研究

本文运用超临界CO2萃取技术提取万寿菊籽油,采用正交设计实验法,研究了温度、压力、萃取时间及CO2流量对籽油提取率的影响,以提取率最大为目标,确定了最佳工艺条件,并对万寿菊籽油进行了感官评定.实验结果表明最佳提取条件萃取时间3h,压力35MPa,温度40℃,CO2流量在20～40kg·h-1.籽油透明、橙黄、无异味,酸价为46.93mg KOH/g油,碘值为50.17g/100g.     

植物种子油超临界流体萃取研究进展

论述了植物种子油超临界流体萃取技术的重要性和最新发展 ,重点就植物种子油萃取研究领域内的实验研究、数学建模以及过程控制和模拟优化技术进行了评述。介绍了人工神经网络技术在超临界流体萃取过程动力学研究中的应用     

Enrichment of omega3 fatty acids from Tyulka oil by supercritical CO2 extraction

BACKGROUND: Supercritical CO₂ enrichment of omega3 essential fatty acids (FAs) from Tyulka oil, using a batch process was investigated. Fractional factorial design was applied to evaluate the effects of the five process parameters: pressure (20.26 to 25.33 MPa); temperature (40 to 50 °C); packing fraction (0.5 to 0.7); modifier fraction (2 to 5%); and dynamic time (15 to 25 min), and their binary interactions on the enrichment of extracted omega3 FAs. By employing experimental design and analysis of variance, the variables were evaluated according to the significance of their effect on the yield of extracted omega3. RESULTS: The experimental results confirmed that pressure and dynamic time were the most important factors affecting enrichment of omega3. The amount of modifier in the feed also showed an increasing effect on the response. The binary interaction effects were investigated, and are discussed in detail. CONCLUSION: Optimum conditions were found at 25.33 MPa, 46.65 °C, packing fraction 0.50, modifier 5% and dynamic time 25 min, improving the enrichment of omega3 FAs up to 2.9 times. Copyright © 2009 Society of Chemical Industry     

Determination of oil content in oilseeds by analytical supercritical fluid extraction

The total oil content of soyflakes, canola seed and wetmilled corn germ were determined by analytical supercritical fluid extraction (SFE) with carbon dioxide as the extraction solvent. Results obtained by SFE were in excellent agreement with those obtained by a conventional Soxhlet technique with organic solvents. The analytical-scale SFE technique yielded average means within one standard deviation of the means derived from the organic solvent-based methodology. Matrices containing both high and low oil content were successfully extracted with carbon dioxide at comparable precision to that obtained with the standard procedure. The supercritical fluid-based technique appears to be a suitable replacement for traditional extraction methods with organic solvents, thereby potentially eliminating the costs associated with solvent disposal and exposure of laboratory personnel to toxic and flammable solvents. Presented at the 4th International Symposium on Supercritical Fluid Chromatography and Extraction, Cincinnati, Ohio, May 20–22, 1992.     

Supercritical fluid extraction of walnut kernel oil

The objective of this study was to investigate the effects of the main process parameters on supercritical fluid extraction of walnut (Juglans regia L.) kernel oil. The recovery of walnut kernel oil was performed in a green and high-tech separation process. CO₂ and CO₂ + ethanol mixtures were used as the supercritical solvent. The extraction was carried out at operating pressures of 30, 40 and 50 MPa, operating temperatures of 313, 323 and 333 K, mean particle sizes of 1.78×10⁻⁴, 3.03×10⁻⁴, 4.78×10⁻⁴, 7.00×10⁻⁴ and 9.00×10⁻⁴ m, supercritical CO₂ (SC CO₂) flow rates of 1.67×10⁻⁸, 3.33×10⁻⁸, 6.67×10⁻⁸ and 13.33×10⁻⁸ m³/s and entrainer (ethanol) concentrations of 2, 4, 8 and 12 vol-%. Maximum extraction yield and oil solubility in SC CO₂ obtained at 50 MPa, 333 K, 9.00×10⁻⁴ m, 3.33×10⁻⁴ m³/h were 0.65 kg oil/kg of dry sample and 37.16 g oil/kg CO₂, respectively. The results obtained in this study showed that the crossover pressure effect of walnut kernel oil was at 30 MPa. At 30 MPa and 313 K, the obtained extraction yields above 4 vol-% ethanol reached the organic solvent extraction yield of 68.5 kg oil/kg dry sample. Extraction time was decreased significantly because of the higher solubility of walnut kernel oil in SC CO₂ + ethanol mixtures.