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where A is proportionality constant; TC is critical temperature (31.10C) and PC is critical pressure (7.39MPa) of solvent CO2. The value of the constant ‘A=0.025’ was evaluated with the help of Curve Expert 1.40. The final dynamic equation was thus found to take the form: It described all the OECs (obtained from the RSM study on turmeric oil extraction) quite well (with R2 ranges from 0.9-0.99). Fig 5(a) and 5(b) show two sample of model fitting curves obtained under operating conditions of SFE of turmeric rhizomes (a) P= 21.6 MPa, T= 600C, and DP=0.3 mm, and (b) P= 24.55 MPa, T= 500C, DP=0.3mm, using annulus extractor AB1. Fig. 5(a) 400C - 600C), both have a slightly positive impact on improving the %OY, whereas smaller particle size (0.3mm) has a significant effect on the %OY. In RSM study using the FC-CCD method, a quadratic model exhibited the best fit to explore the relationship between operating parameters of SFE and the yield of turmeric rhizomes. Chemical analysis of extract obtained from SFE applying optimum operating conditions and annulus bed geometry revealed the presence of 57.21% ar-Turmerone and 14.63% β –Turmerone, which indicates the good quality of the product. Thus, it may be concluded that though the study of annular geometry in place of traditional cylindrical geometry of the extractor indicates an improvement of extractor performance in terms of increasing rate and yield of extraction for moderate extraction period or reduced extraction time to extract economically, further systematic studies with different bed geometries are necessary to correlate hydrodynamic behaviour for establishing a suitable criterion that can be used to predict extractor performance along with its economic gain. Acknowledgments All the authors profusely acknowledge the grant of AICTE for the development of Supercritical Fluid Extraction facilities under MODROB scheme where all the research works were carried out. Part of the running experiments was financially supported by IIChE, Kolkata, India. We are also grateful to M/s Imperial Fragrances & Flavours Pvt. Ltd., Howrah, West Bengal, India for extending its support towards GC-MS analysis of turmeric oil samples free of cost. LIST OF ABBREVIATIONS ANOVA Analysis of variance AB Annulus Bed CB Conventional Cylindrical Bed CCD Central composite design International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-8 June, 2019 Fig. 5(b) CER Fig 5 (a) & 5(b): Model Fitting Overall Extraction DP Constant extraction rate Particle size Face centered central composite design Curves of Turmeric Oil FC-CCD GCMS Gas chromatograph mass spectrometer IV. CONCLUSION AND FUTURE SCOPE %OY QCO2 Solvent flow rate In the present study, turmeric oil was extracted from dried milled turmeric rhizomes using Soxhlet extraction and SCO2E (without applying any co-solvent) methods. % OY obtained from the Soxhlet method was 5.42% and that obtained from SCO2E (for an extraction period of four hours) was in the range of 1.84 to 4.45%. Influence of individual process parameters like temperature, pressure, particle size and bed design geometry on turmeric oil-extract was studied thoroughly and the data were analyzed by using statistical response surface methodology (RSM). Annulus bed geometry shows a definite impact on the rate of extraction and %OY over conventional cylindrical geometry under the same operating conditions. Analysis of results of interaction plots indicates that pressure (in the range of 21.6-27.5 MPa) and temperature (in the range from RSM Response surface methodology SCO2 Supercritical CO2 SCO2E Supercritical fluid extraction technology using CO2 SFE tE tS Published By: OEC Overall extraction curve Percentage of oil yield Supercritical fluid extraction Period of Extraction Static period of extraction Blue Eyes Intelligence Engineering Retrieval Number: H6344068819/19©BEIESP 331 & Sciences PublicationPDF Image | Supercritical CO2 Extraction of Essential Oil from Turmeric
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