Sakdasri, Winatta
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Item type:Publication, Ultrasonic-assisted Extraction of Dietary Fiber from Defective Lemon Basil (Ocimum basilicum var. citriodorum) Seed(2025-01-01); Lemon basil (Ocimum basilicum var. citriodorum) is an herbaceous plant cultivated for seed consumption only in Sukhothai Province, Thailand. Unlike cultivating for fresh leave consumption, the production of lemon basil seed requires maturity and reproduction phases, the same as rice and wheat. After harvesting, the farmer separates unmatured red basil seeds (RBS) because of their diverse color. The RBS contains valuable compounds, such as dietary fiber, that could be extracted by an ultrasonic-assisted extraction (UAE). This work aims to extract DF with the highest brightness using L*a*b* color in liquid form as an indicator. The optimal condition was identified by the crossing point between the brightness (L*) and extraction yield. The proximate nutrient analysis showed that RBS has a higher fiber content than high-quality basil seed (HBS). For water swelling ability, HBS performed 4-fold higher than RBS. The complete extraction of dietary fiber was observed at 10 min for UAE at 200 W, a water-to-seed ratio of 30:1, and 100% amplitude, and it was preferably conducted at room temperature (30±2°C) without an external cooling system. The correlation between UAE extraction time and temperature at constant total power and amplitude was also explored. When the extraction temperature exceeded 80°C, the extracted mucilage was rotten within 24 h, even if stored at 4°C. Moreover, the extracted RBS contained Omega-3 oil that a screw-press machine or supercritical CO2 could extract in further study. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimization of yield and thymoquinone content of screw press-extracted black cumin seed oil using response surface methodology(2023-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Biodiesel Production from Rambutan Seed Waste by Supercritical Ethanol: Economic Analysis(2025-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Biodiesel Production from Spent Coffee Grounds by Using Ethanolic Extraction and Supercritical Transesterification(2024-12-01); Sawangkeaw, RuengwitThis work presents a way to use ethanol and spent coffee grounds (SCG) as feedstocks for biodiesel production to solve ethanol overproduction in Thailand and biodiesel feedstock shortage problems together. Waste coffee oil (SCGO) was ethanolic extracted from SCG; then, ethanol-SCGO mixture was transesterified in supercritical condition without ethanol removal. The ethanolic extraction curves of SCG at a temperature range of 50–70 °C were constructed. Transesterification experiments were studied in a batch reactor and a continuous reactor at various temperatures (275–350 °C) and reaction time (5–40 min) under 15.0 MPa. The molar ratio of ethanol-oil mixture was set at 30:1. The highest ester content of 88.37 ± 3.00 wt% was found in biodiesel obtained at a temperature of 275 °C and a reaction time of 40 min in a batch reactor. Furthermore, excess temperature (< 300 °C) and reaction time (< 20 min) induced thermal degradation and promoted the loss of ethyl linoleate. For continuous reactor, the maximum ester content of 83.38 ± 5.86 wt% was observed at 325 °C and 29.4 min of residence time. Unlike in batch reactors, thermal degradation of ethyl linoleate was not observed in a continuous reactor. The results showed that ethanolic extraction and supercritical transesterification are alternative ways to produce biodiesel from SCG without removing extractant and using catalyst. From a prospective point of view, techno-economic analysis (TEA) and life-cycle assessment (LCA) of invented process should be conducted to ensure profitability and environmental benefits, respectively. Graphical Abstract: (Figure presented.) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Biodiesel production from spent coffee grounds via ethanolic extraction and supercritical ethanol transesterification: technoeconomic analysis and life cycle assessment(2026-01-01); Hunsub, PanusornPrevious studies have developed biodiesel production methods from spent coffee grounds (SCGs) via ethanolic extraction and supercritical ethanol transesterification (EE-SET) to minimize the energy consumption associated with solvent evaporation. In this study, we perform a technoeconomic analysis (TEA) and a life cycle assessment (LCA) to evaluate the profitability and sustainability of EE-SET. The material and energy balances in the TEA and LCA were derived from Aspen Plus<sup>®</sup> V12 based on experimental data from previous research. The results from the base case indicated that EE-SET was unprofitable and posed a considerable environmental burden by disposing of defatted SCG (DSCG) as solid waste due to two main issues. First, the amount of DSCG was 4.8 times greater than the total biodiesel and glycerol produced. Second, landfilling DSCG incurred waste treatment costs and induced greenhouse gas (GHG) emissions simultaneously. Selling DSCG as a feedstock for solid fuel pellets offers an effective strategy for achieving profitability and sustainability. As such, EE-SET addresses the economic drawback of generating profit from selling DSCG while reducing waste treatment costs. Using DSCG as a solid fuel for environmental benefits increases ash disposal credit and substantially reduces GHG emissions. The incorporation of pelletizing units or biomass power plants into EE-SET represents a promising avenue for future research. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Effects of temperature and pressure on volatile compounds of black cumin seeds (Nigella sativa L.) oil extracted by supercritical carbon dioxide(2025-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ethyl acetate as extracting solvent and reactant for producing biodiesel from spent coffee grounds: A catalyst- and glycerol-free process(2022-07-01); Sawangkeaw, RuengwitOil was extracted from spent coffee grounds (SCGs) using ethyl acetate at atmospheric pressure; then, the ethyl acetate–SCG oil mixture was reacted under supercritical conditions, which involve a catalyst-free process. Moreover, ethyl acetate reacted with glycerol to form triacetin, which dissolves in biodiesel and acts as a fuel additive. Using this approach, the solvent removal step and glycerol byproducts are eliminated. The highest fatty acid ethyl ester contents of 91.80 wt% ± 1.62 wt% and 86.44 wt% ± 2.12 wt%. were obtained under optimal conditions in batch and continuous reactors, respectively. Based on gas chromatography–mass spectrometric analysis, no trace of glycerol was detected and triacetin was yielded at 4.22 wt%. This novel process simultaneously minimizes the number of chemicals used and the amount of waste generated because it employs only dried SCGs and ethyl acetate as the feedstock. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Technoeconomic analysis of biofuel production from spent coffee grounds using supercritical ethyl acetate(2026-03-01); Sawangkeaw, RuengwitThis study is a techno-economic analysis of biodiesel production from spent coffee grounds (SCGs) using ethyl acetate as an extracting solvent and a reactant through interesterification under supercritical conditions—a process called SCEA. Aspen Plus V12 was employed to simulate the SCEA process compared to the conventional biodiesel production process. Both processes operated at an original feed rate of 24,225 tonnes per year, but the production capacities of the conventional and SCEA processes were 1000 tonnes per year and 1800 tonnes per year, respectively. Because of the simplicity of SCEA, the fixed capital investment costs were lower than those of the conventional process. However, at the original feed rate, neither process was profitable within a project lifetime of 20 years. The production capacity of SCEA was increased to 4 times, 8 times, and 16 times its original size to identify the most effective scale for the production facility. The SCEA process commenced successfully with a production capacity of 7500 tonnes per year, but the payback period of 19.5 years was deemed unsatisfactory. The production capacities of 15,000 tonnes per year and 30,000 tonnes per year provided the payback periods of 7.67 years and 6.08 years, respectively. Nonetheless, the 15,000-ton plant requires 193,798 tonnes SCGs per year as feedstock, which is 12 times the annual coffee production in Thailand. Hence, this project is well-suited for large coffee producers when utilizing SCGs as a singular feedstock. Combining other feedstocks, such as microalgae, non-edible seeds, and waste fruit seeds, with SCGs presents an optional pathway for future research on biodiesel production.