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As with other rotary vacuum filters, there is relatively little flexibility in the cycle (the ratio of filtration time to air-drying time is fixed by the compartmentalization of the control valve and there is almost no flexibility in the slurry height (in contrast to a vacuum drum filter)).Ĭake washing can be performed on a vacuum disc filter, once the sector has emerged from the trough. The slurry feed can either be controlled by a feed valve/level sensor or can be set at a standard rate (if the slurry composition, vacuum and cloth condition remain constant then so will the throughput) with a weir overflow sending surplus slurry back to the feed tank.Ĭake formation and filtration occur during the time that the sector spends in the trough. The slurry is normally fed directly into the slurry trough. In some cases an agitator system may be needed. The larger surface area rotating through the trough (compared to a drum filter of similar overall size) means that the slurry is more highly agitated by the filter itself.
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This trough may be partly compartmentalized in order to reduce the volume held in it at any one time (and therefore reduce the residence time of slurry in the trough). The barrel is supported on bearings and may be either directly driven by a motor or indirectly through a gearbox. A number of discs can be fitted to the same central barrel. Each sector is connected to the control plate by individual pipes (or hoses) or through fabricated channels in the central barrel to form a disc. The filter cloth is usually supplied as a cone, which is fitted over the sector and sealed top and bottom. Cake discharge usually occurs at atmospheric pressure via a scraper blade.įigure 4.25. Both cake deliquoring by gas blowing and displacement washing, can be performed reasonably effectively at different pressures through a multi-compartment arrangement within the housing. Raised temperatures can be accommodated as can volatile and toxic feeds. Rather than applying a vacuum inside the compartments of the drum, the pressure inside the housing is raised by compressed gas up to 800 kPa and this facilitates constant pressure filtration at the outer drum surfaces. It comprises a rotating, bottom-fed drum of area up to 120 m 2 enclosed within a sealed housing. The rotary pressure drum filter is similar in principle and basic form to the rotary vacuum drum filter (see Section 1.4.1.5). Typical particle size and feed concentration range: 1–100 μm and 5–30+% w/w. Typical uses: Continuous separation of finer particle suspensions where cakes require post treatment. Wakeman, in Solid/Liquid Separation, 2007 Rotary pressure drum Our finding demonstrated the optimum condition of the betaine-sorbitol NADES-UAE method for CGA and caffeine extraction and the potential pancreatic lipase inhibition activity from the Robusta green coffee bean.E.S. Furthermore, obtained Robusta green coffee extract from the optimum condition of the betaine-sorbitol NADES-UAE showed high potential to inhibit lipase activity with IC 50 of 18.02 μg/ml, comparable with IC 50 of standard CGA (11.90 μg/ml) and caffeine (15.59 μg/ml), where potential interaction of both standards was confirmed using molecular docking analysis. According to the results, the optimum conditions of the betaine-sorbitol NADES-UAE have obtained the betaine-sorbitol ratio of 1.25: 1.2 mol, solid-liquid ratio of 1:30 mg/mL, and 60 min extraction time. Whereas in vitro lipase inhibitory activity assay examined by spectrophotometric measurement and in silico molecular docking analysis on PDB ID: 1LPB. CGA and caffeine content was determined by High-Performance Liquid Chromatography. The response surface was calculated by using CGA and caffeine content as response values. Response surface methodology and Box-Behnken Design were used to optimize the extraction process. The betaine-sorbitol NADES-UAE factors as experimental design variable parameters include betaine-sorbitol ratio (0.5:1.2, 1.25:1.2, and 2:1.2 mol), extraction time (10, 35, and 60 min), and solid-liquid ratio (1:10, 1:20, and 1:30 g/mL). This study aims to optimize the betaine–sorbitol NADES-based ultrasound-assisted extraction (UAE) method of CGA and caffeine from Robusta green coffee beans and determine the inhibitory activity of robusta green coffee beans extract of the betaine-sorbitol NADES-UAE from the optimum condition on pancreatic lipase in vitro and in silico. Chlorogenic acid (CGA) and caffeine, a well-known compound in the coffee bean, have various potential health benefits. Natural deep eutectic solvent (NADES) is an alternative approach in natural product extraction with various advantages, including low toxicity, biodegradable, and suitable phytochemical compounds in a wide range of polarity.