Utrasonic topic: "Ultrasonically improved mass transfer"
Mass transfer is the net movement of mass from one location, usually meaning stream, phase, fraction or component, to another. Mass transfer occurs in many processes, such as solid-liquid and liquid-liquid extraction, catalysis, precipitation, dehydration and many other chemical and biological reactions. Naturally occurring mass transfer can be often very slow and time-consuming, so that mass transfer intensification by mechanical means is applied to accelerate reactions and processes. Efficiency of mass transfer is dependant on the effects on external or internal mass transfer resistance. External mass transfer improvement can be achieved by decreasing the boundary layer thickness. Internal mass transfer improvements are caused by sonication, where ultrasonic waves cause changing pressure fields and micro-mixing within the product.
Power ultrasound is an effective method to create shear forces, turbulences and micro-mixing in liquids and slurries. Acoustic cavitation is used to induce and accelerate chemical reactions due to improved mass transfer between reactants, to break cells and extract intracellular material improving the release of extracts by improving the mass transfer between cell interior and solvent, to improve diffusion coefficients and decrease the boundary layer of diffusion for dewatering and drying processes and many more applications.
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Deep eutectic solvents (DESs) and natural deep eutectic solvents (NADES) offer advantages as extraction solvents on many levels and are thereby a promising alternative to conventional organic solvents. Deep eutectic solvent work excellent in combination with ultrasonic extraction and…https://www.hielscher.com/extraction-with-deep-eutectic-solvents.htm
Ultrasonication is an efficient and simple method to produce magnesium hydride for hydrogen storage. Ultrasound accelerates the hydrolysis of magnesium and hydrogen in order to form magnesium hydride. In contrast to the conventional dissociative chemisorption process, ultrasonic hydrolysis of…https://www.hielscher.com/magnesium-hydride-synthesis-via-hydrolysis.htm
Ultrasonic extraction alone or in combination with alternative extraction methods such as solvent extraction or supercritical CO2 extractors is successfully used to extract the full spectrum of cannabinoids from the cannabis plant (hemp and marijuana). In marijuana, the main…https://www.hielscher.com/supercritical-fluid-extraction-improved-by-power-ultrasonics.htm
Electro-Sonication is the combination of the effects of electricity with the effects of sonication. Hielscher Ultrasonics developed a new and elegant method to use any sonotrode as electrode. This puts the power of ultrasound directly at the interface between…https://www.hielscher.com/electro-sonication-ultrasonic-electrodes.htm
Hydrogen is an alternative fuel that is preferable due to its environmental-friendliness and zero carbon dioxide emission. However, conventional hydrogen generation is not efficient for economical mass production. The ultrasonically promoted electrolysis of water and alkaline water solutions results…https://www.hielscher.com/efficient-hydrogen-production-with-ultrasonics.htm
Ultrasonic extraction enhances the yield of extracted sucrose from sugar beet cossettes and reduces the extraction process duration significantly. Sonication is a simple and safe technique, which can be easily combined with the current counter-current flow extraction technology in…https://www.hielscher.com/ultrasonic-extraction-of-sugar-from-sugar-beet-cossettes.htm
Polyethylene terephthalate (PET) is a huge waste source coming mostly from used water and beverage bottles. Until recently, recycling of PET resulted in low quality plastics. A new mutant enzyme promises the degradation of PET into pristine raw material,…https://www.hielscher.com/ultrasonically-promoted-enzymatic-plastic-recycling.htm
Ultrasonic aromatisation and flavouring of edible oils is based on the ultrasonic extraction of flavour compounds from botanicals such as herbs, spices, fruits etc. Sonication is a process intensifying method, which releases bioactive components into the oil. As a…https://www.hielscher.com/maceration-and-aromatisation-by-sonication.htm
Jellyfish collagen is a high-quality collagen, which is unique but exhibits similar properties to type I, II, III and type V collagen. Ultrasonic extraction is a purely mechanical technique, that increases yield, accelerates the process and produces high molecular…https://www.hielscher.com/ultrasonic-collagen-extraction-from-jellyfish.htm
Capsaicin is the main flavour and spice compound in hot peppers, also known as chilies. To produce high-quality capsaicin as aromatic flavour and medicinal ingredient, an efficient, yet mild extraction technique is required to prevent degradation. Ultrasonic extraction is…https://www.hielscher.com/ultrasonic-capsaicin-extraction-from-hot-chili-peppers.htm
Astaxanthin is a highly potent antioxidant used in pharmaceuticals and nutritional supplements. In order to produce high-quality astaxanthin from natural sources such as algae, a high-performance extraction technique is required. Ultrasonic extraction is a mechanical treatment, which gives high…https://www.hielscher.com/ultrasonic-astaxanthin-extraction-for-higher-yields-and-superior-quality.htm
Vanilla extract is a flavour solution extracted from vanilla pods in a solution of ethanol and water. To produce high-quality vanillin as aroma, flavour and fragrance component, an efficient, yet mild extraction technique is required to prevent decomposition. Ultrasonic…https://www.hielscher.com/ultrasonic-vanilla-extraction-a-non-thermal-method.htm