Dense Gases for Extraction and Refining

Stahl, Egon; Quirin, Karl‐Werner; Gerard, Dieter

doi:10.1007/978-3-642-72892-1

Cited by 188 publications

(192 citation statements)

References 0 publications

Supporting

Mentioning

181

Contrasting

Unclassified

Order By: Relevance

“…Para estas condições térmicas, a densidade do solvente aumenta à medida que a temperatura aumenta, resultando em um aumento no poder de solvatação do CO 2 e, consequentemente, no maior rendimento global (STAHL et al, 1988).…”

Section: Resultsunclassified

Extração do óleo de manjericão usando fluido supercrítico: analise experimental e matemática

2014

View full text Add to dashboard Cite

O óleo essencial de manjericão (Ocimum basilicum L.) é valorizado no mercado internacional e amplamente usado nas indústrias de condimentos, cosméticos e medicinais. Entre todos os processos que podem ser aplicados na obtenção do óleo, a extração usando fluido supercrítico (EFS) pode ser um método seletivo e eficiente, dependendo das condições operacionais, como temperatura e pressão, que precisam ser otimizadas. O objetivo deste estudo foi comparar a eficiência da extração supercrítica, utilizando planejamento experimental, na extração do óleo de manjericão com os métodos convencionais (hidrodestilação e soxhlet). Para a realização da parte experimental, foi utilizado dióxido de carbono como solvente para a EFS e hexano, para aplicação no soxhlet. Foi realizado um delineamento central composto rotacional (DCCR), aplicando três pressões (100, 200 e 300 bar) e três temperaturas (30, 40 e 50ºC). Através da hidrodestilação, obteve-se o menor rendimento (0,26%), usando o Soxhlet, o rendimento foi de 2,39% sendo superior, comparado á EFS, que foi de 0,43%. O DCCR mostrou que, para otimizar o processo, é necessário aumentar a pressão e a temperatura para o alcance de maiores rendimentos. Foi possível constatar que o modelo matemático representou bem o processo de extração, propiciando o "scale-up" deste.

show abstract

Section: Resultsunclassified

Extração do óleo de manjericão usando fluido supercrítico: analise experimental e matemática

2014

View full text Add to dashboard Cite

show abstract

“…This can easily be modified by varying pressure and temperature (Dauksas, Venskutonis, & Sivik, 1998;Francisco & Dey, 2003;Reverchon & Camillis, 1991). Due to the poor solvent capacity of supercritical CO 2 , the addition of small quantity of organic solvent as a cosolvent or modifier or entrainer has also been recommended to increase the solubility of the analyte or possibly to increase the separation of coextractives (Dobbs, Wong, Lahiere, & Johnston, 1987;King, 1993a,b;King & France, 1992;Reverchon & Camillis, 1991;Stahl, Quirin, & Gerald, 1988). In fact, the organic solvent can improve selectivity of the target analytes extracted by SC-CO 2 from the sample matrix, thus resulting in higher extraction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of polar cosolvents on cocoa butter extraction using supercritical carbon dioxide

Asep

Selamat

Jahurul

et al. 2013

Innovative Food Science & Emerging Technologies

View full text Add to dashboard Cite

“…Supercritical carbon dioxide (sc-CO2) has also been applied to propolis, yielding highly valuable products (Catchpole et al, 2004;Wang and Yu et al, 2004). Raw propolis was extracted by Stahl et al (1988) using supercritical CO 2 at 600 bar and 40°C to extract the wax and leave the insoluble flavonoids behind. Catchpole et al (2004) used sc-CO 2 both as an antisolvent to precipitate high molecular mass components, and also as a solvent to extract the ethanol and the soluble components of the EEP (nondried).…”

Section: Introductionmentioning

confidence: 99%

Supercritical CO2 extraction of raw propolis and its dry ethanolic extract

Paviani

Saito

Dariva

et al. 2012

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-Three types of propolis extract were prepared and analyzed with respect to their global extraction yields and with respect to the concentration of the following markers: 3,5-diprenyl-4-hydroxycinnamic acid; 3-prenyl-4-hydroxycinnamic acid; 4-hydroxycinnamic acid and 4-methoxy-3,5,7-trihydroxyflavone. The extract EEP (ethanolic extract of propolis) was obtained by the conventional method from raw propolis using ethanol as solvent. The extracts (SFE) were obtained by supercritical solvent extraction from the raw propolis using supercritical carbon dioxide (sc-CO 2 ), with and without the addition of ethanol as a co-solvent. The fractionated supercritical extracts (FSCE) were obtained by fractionation (extract and raffinate) of the dry EEP with sc-CO 2 . EEP yields of 39.5% were obtained and maximum global extraction yields were 7.3% for SFE with no co-solvent, 51% for SFE with 15% ethanol and 18% for the FSCE extract fraction. The concentrations of the markers in the different extracts differed as a function of the operational parameters, indicating that the addition of co-solvent and the selectivity of sc-CO 2 could be manipulated so as to obtain extracts with the yields and concentrations of interest.

show abstract

Dense Gases for Extraction and Refining

Cited by 188 publications

References 0 publications

Extração do óleo de manjericão usando fluido supercrítico: analise experimental e matemática

Extração do óleo de manjericão usando fluido supercrítico: analise experimental e matemática

Effects of polar cosolvents on cocoa butter extraction using supercritical carbon dioxide

Supercritical CO2 extraction of raw propolis and its dry ethanolic extract

Contact Info

Product

Resources

About