Ravindra Bhargava’s research while affiliated with Indian Institute of Technology Roorkee and other places

... Molero-Gómez and Martinez de la Ossa (2022) indicated that, at constant pressure, increases in CO 2 flow rate cause greater performance in the short term, while in prolonged extractions, a lower CO 2 flow rate maintains a constant solubility in the late phases or when the amount of remaining oil is low. Rai et al. (2017) reported that the increase in the CO 2 flow rate causes a decrease in the resistance to mass transfer, thereby increasing extraction yield; this is because the number of CO 2 molecules in the extraction chamber regenerates the contact surface and favors the flow rate of solvent from the inside to the outside. It can be observed in Figure 2B that an increase in extraction performance was generated by the increase in CO 2 flow rate from 3 to 7 mL/min. ...

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Optimization of extraction in supercritical fluids in obtaining Pouteria lucuma seed oil by response surface methodology and artificial neuronal network coupled with a genetic algorithm

... The faster the seeding plate rotates during the sowing of Brassica chinensis, the less time the metering device has to fill, which can easily lead to missed rate and a low qualified rate. The performance of the air-absorbing metering device is mainly influenced by negative pressure, the rotation speed of the seeding plate, the number of suction holes, and the shape of the air chamber [6] . Due to the complex movement of the seeds during the actual operation of the metering device, it is not possible to visually observe the effect of the seeds on the airflow field. ...

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Optimization of a three-row air-suction Brassica chinensis precision metering device based on CFD-DEM coupling simulation

... For this purpose, reliable and robust mathematical modeling served as a powerful and useful tool for in-depth understanding of process mechanisms before being used for design, operation, process control, and optimization of the process. Mathematical modeling of SFE packed bed column enables the generalization of the experimental observations from the studied systems to new systems [3,11,22,[28][29][30][31][32][33]. In addition, scaling up from laboratory to pilot and industry scales as well as economic evaluation J o u r n a l P r e -p r o o f of the process are not feasible without such models [29]. ...

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Modeling of supercritical fluid extraction bed: A Critical Review

... CO 2 at its supercritical uid state has high solvation power and can diffuse like a gas in solid matrices. [94][95][96] In addition, ethanol or methanol, as a polar co-solvent, can be added into supercritical CO 2 to target the extraction of polar compounds (e.g. phenolics) (Fig. 4). ...

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Road to valorisation of melon seeds (Cucumis melo L.): a comprehensive review of nutritional profiles, biological activities, and food applications

... The concentrations of the scale components can also vary based on the type of chemical treatment utilized, as well as differences in the raw sugar juice's phosphate, calcium, and organic acid content. Similar trends have been observed by other researchers in different plants in different countries (Srivastava et al. 2016;Lehnberger et al. 2013). ...

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Descaling of Evaporator Tubes in Sugarcane Factories Using Molasses as a Green and Effective Technology

... The model was validated against other published models and industrial data, obtaining a good prediction of the steam consumption (error < 3%). Srivastava et al. [22] presented the model of a falling film evaporator used for the sugar industry. The validation was done by the comparison with data from industrial plants, showing a maximum error of ±2% for the exit liquor concentration, vapor body temperature, and vapor bleed. ...

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Dynamic modeling of a multi-effect vertical falling-film evaporator for water reuse in CSP plants

... Another type of CCD that has also been employed in the simulation oil extraction processes is the Faced Centered Composite Design (FCCD) which is less robust than CCRD. In the SFE of sunflower oil, Rai et al. (2016), used a FCCD to obtain R 2 , R 2 adj, and predicted R 2 values of 0.9998, 0.9989, and 0.3848, respectively, for the selected quadratic model. The very low value for predicted R 2 was explained by the presence of many insignificant values in the model, but no report on utilization of FCCD for yellow oleander oil extraction. ...

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Impact of Statistical Software and Separation Methods for Bio-Oil Extraction from Yellow Oleander Seeds: A Review (2011-2023)

... However, the major disadvantage of hexane is that it is not environmentally friendly (Hammond et al. 2005). Considering the health of the public, industries are looking for a better substitute that will reduce pollution in the environment (Rai et al. 2015). Ethanol was introduced due to its advantage from an environmental point of view. ...

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Comparative simulation studies on the countercurrent multi-stage solid–liquid extraction of soybean oil by ethanol and hexane

... Vapor bleeding is done to preheat the feed or liquor near to temperature of the effect it is entering into so that liquor can easily attain boiling temperature inside the effect. This increases evaporator capacity as a result steam consumption is reduced and steam economy improved (Bhargava et al., 2008a).Vapor bleeding not only reduces steam consumption and increases steam economy, but also it provides room for process improvement of the evaporation process (Srivastava et al., 2013). However, vapor bleeding comes with addition costs of installation and running heat exchangers in the evaporator station (Khanam and Mohanty, 2010;Yadav and Verma, 2020), giving more room for more research work on process performance and addition costs on vapor bleeding. ...

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Effect of vapor-bleeding and its configurations on multiple-effect sugarcane juice evaporator performance

... The water network optimization approach has been applied to different industries like pulp and paper, chemical, glass, textile, etc. in literature [21][22][23][24]. To the authors' best knowledge, there are very few works reported in the literature related to superstructure-based water networks for the steel industry [25,26]. ...

Reference:

Towards achieving SDG-6 in steel industry: A superstructure optimization-based approach