Effect of the Instant Controlled Pressure-Drop DIC Technique on the Supercritical Carbon Dioxide Date Seeds Oil Extracti
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RESEARCH ARTICLE-CHEMICAL ENGINEERING
Effect of the Instant Controlled Pressure-Drop DIC Technique on the Supercritical Carbon Dioxide Date Seeds Oil Extraction Mehdi Louaer1 · Ahmed Zermane1,2 · Colette Besombes3 · Karim Allaf3 · Abdeslam Hassen Meniai1 Received: 7 July 2020 / Accepted: 23 October 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The present study deals with the effect of combining instant controlled pressure-drop DIC texturing as a pretreatment step and the supercritical carbon dioxide extraction of date seeds oil in order to improve the extraction yield and/or time. Ground samples with mean particle size of 0.9 mm and undergoing no further treatments were used. Since the impact of DIC texturing mainly depends on the treatment time t and the absolute saturated steam pressure P, a response surface methodology RSM was carried out using these two independent factors and the oil yields and effective diffusivity as the response variables. A scanning electron microscope SEM showed that DIC pretreatment induced controlled modifications of the structure, breaking cell walls, thus enhancing the extraction performance. The results showed that the optimum extraction yield of DIC pretreated samples increased by an improvement over control of 15.48% and the extraction time reduced by 30%, which is quite encouraging. Keywords Date seeds oil · DIC · Process enhancement · SFE · Texturing
Abbreviations Adj MS Adj SS DF DoE F value P value SE coef Seq SS T value
Adjusted mean squares Adjusted sum of squares Degree of freedom Design of experiments Fisher’s function Probability threshold Standard error for the estimated coefficient Sequential sums of squares Test statistics
1 Introduction Supercritical fluid extraction (SFE) has been increasingly presented as an alternative to conventional extraction techniques such as solvent extraction and hydrodistillation which
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Abdeslam Hassen Meniai [email protected]
1
Laboratory of Environmental Engineering Processes, University of Constantine 3, Constantine, Algeria
2
University Larbi Ben M’Hidi, Oum El Bouaghi, Algeria
3
Laboratory of Engineering Science for Environment, University of La Rochelle, La Rochelle, France
have some drawbacks in terms of solvent toxicity, long processing times, low yield and high energy consumption [1]. The interest in supercritical fluid extraction technology is getting greater due to the high quality of the extracts with desirable composition and also the absence of incidences on the environment. However, its high cost which is directly related to the extraction time seems to be the main impediment to a larger use of this highly interesting extraction process, hence the search, the development and the test of pretreatment techniques to improve these two criteria, i.e., the extraction yield and the processing time, and the present work fits into this perspective. In fact, several pretreatment techniques including drying, grinding, etc., are traditionally known and the main objective of the present study is to test th
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