Alcoholic extraction of vegetable oils. I. Solubilities of cottonseed, peanut, sesame, and soybean oils in aqueous ethanol

Rao, Rama Kanth; Krishna, M Ghanashyam; Zaheer, S. Husain; Arnold, Lionel K.

doi:10.1007/bf02639700

Cited by 47 publications

(34 citation statements)

References 3 publications

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“…higher temperature promoted the solubility of the macauba pulp oil in the solvents evaluated (p < .05) and provided a higher yield. This effect was also observed byZhang et al (2009), Hu et al (2012,and Mello et al (2016) in the UAE of almond, safflower and chia oil, respectively, on increasing the extraction temperature from 40 to 60 8C Rao, Krishna, Zaheer, & Arnold (1955). reported the increased solubility of various vegetable oils in ethanol with an increase in temperature, while a decrease in the viscosity and solvent density increased the oil diffusion coefficient according toSantos, Martins, Caneschi, Aguilar, & Coimbra (2015) andToda et al (2016).…”

supporting

confidence: 53%

“…Rao, Krishna, Zaheer, & Arnold () reported the increased solubility of various vegetable oils in ethanol with an increase in temperature, while a decrease in the viscosity and solvent density increased the oil diffusion coefficient according to Santos, Martins, Caneschi, Aguilar, & Coimbra () and Toda et al (). The application of elevated temperatures softens the tissue of the solid matrix, facilitating the elution of the bound oil into the solvent (Samaram et al, ).…”

Section: Resultsmentioning

confidence: 94%

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Ultrasound‐assisted extraction of oil from macauba pulp using alcoholic solvents

Rodrigues¹,

Mello

Garcia³

et al. 2017

J Food Process Engineering

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Ultrasound‐assisted extraction (UAE) of macauba pulp oil was investigated using ethanol and isopropanol as solvents and compared with the conventional extraction technique. An experimental design was applied to evaluate the influence of the experimental variables (temperature, solvent to pulp ratio, and time) on the oil extraction and to optimize them. The optimum conditions were then evaluated in relation to the extraction kinetics and the effect of the application of ultrasound in the process was determined. For both techniques, higher yields were obtained with the use of ethanol as the solvent. The results showed that increasing the temperature, the amount of solvent used and the extraction time leads to greater oil removal from macauba pulp (p < .05), and the amount of solvent used in the process had the greatest influence. The maximum oil yields obtained by UAE were 49.2 and 38% with ethanol and isopropanol, respectively, obtained at 60 °C, with a 90‐min extraction time and solvent to pulp ratio of 10, which represent ∼86 and ∼77% of the yield obtained by conventional extraction. The UAE provided better yields when compared to the process without ultrasound. The fatty acids composition was not influenced by the extraction method and solvent used; however, UAE provides oils with higher levels of β‐carotene and flavonoids using ethanol and isopropanol, respectively. Practical applications The optimization of UAE for macauba pulp oil extraction is presented in the present study and the results demonstrate the efficiency of the method for obtaining this oil in low extraction time and solvent consumption. The oil obtained by this technique has higher levels of β‐carotene and flavonoids. Additionally, macauba pulp oil obtained using ethanol and isopropanol with solvent may be used as a food, because these solvents are considered of food grade.

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supporting

confidence: 53%

Section: Resultsmentioning

confidence: 94%

Ultrasound‐assisted extraction of oil from macauba pulp using alcoholic solvents

Rodrigues¹,

Mello

Garcia³

et al. 2017

J Food Process Engineering

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“…Information on the solubility of soybean oil in various solvents is scanty. Solubility data was therefore generated with absolute solvents using dynamic method (Rao et al, 1955). Commercially available oil was used, which had a 1.3 acid value, 130 iodine value and 190 saponification value.…”

Section: Solubility Datamentioning

confidence: 99%

Studies on alternative solvents for the extraction of oil‐I soybean

Gandhi

Joshi

Jha

et al. 2003

Int J of Food Sci Tech

105

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“…This solvent can be emitted during extraction and recovery and it has been identified as an air pollutant since it can react with other pollutants to produce ozone and photochemical oxidants [10,11]. Edible oil producers are more interested in alternative solvents less dependent on petroleum sources [12], such as ethanol [13,14], iso-propanol [15][16][17] and acetone [18].…”

Section: Introductionmentioning

confidence: 99%

Performance of Nanofiltration Membranes for Solvent Purification in the Oil Industry

Darvishmanesh

Robberecht

Luis

et al. 2011

J Americ Oil Chem Soc

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The extraction stage of edible oil in the oil industry is commonly performed by using toxic solvents (e.g. hexane) and processes with high energy consumption (e.g. distillation, evaporation) to recover the solvent, which represents around 70-75 wt% in the oil-solvent mixture. In this paper, a membrane-based extraction method using nanofiltration (NF) membranes is presented. Commercial nanofiltration membranes made of different polymers (Desal-DK-polyamide NF from GE-osmonics Ò , NF30 polyethersulfone NF from Nadir Ò , STARMEM TM 122 polyimide from MET Ò and SOLSEP NF030306 silicone base polymer SOLESP Ò ) were selected and tested to recover the solvent from soybean oil/solvent (10-20-30% w/w oil) mixtures at various separation pressures and constant temperature in a dead-end filtration set up. The selection of the solvent was made in order to compare solvents obtainable from renewable resources, such as ethanol, iso-propanol and acetone, with solvents traditionally used in the industry (i.e. cyclohexane and n-hexane). The structural stability of the membranes towards the different solvents used in this work was verified visually, by the variation of the membrane area and by means of permeate flux assessments. Desal-DK and NF30 showed poor filtration performance and even visible defects after exposure to acetone but a good performance was obtained for the nanofiltration membranes STARMEM TM 122 and SOLSEP NF030306 with ethanol, iso-propanol and acetone. For example, considering a mixture with 30% edible oil in acetone, STARMEM TM 122 shows a flux and oil rejection of 16.8 L m -2 h and 70%, respectively. For the same conditions, SOLSEP NF030306 exhibited a flux of 4.8 L m -2 h with 78% rejection, which shows the potential application of nanofiltration membranes in the oil industry.

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Alcoholic extraction of vegetable oils. I. Solubilities of cottonseed, peanut, sesame, and soybean oils in aqueous ethanol

Cited by 47 publications

References 3 publications

Ultrasound‐assisted extraction of oil from macauba pulp using alcoholic solvents

Ultrasound‐assisted extraction of oil from macauba pulp using alcoholic solvents

Studies on alternative solvents for the extraction of oil‐I soybean

Performance of Nanofiltration Membranes for Solvent Purification in the Oil Industry

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