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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In organic chemistry, organocatalysis is a form of catalysis in which the rate of a chemical reaction is increased by an organic catalyst. This "organocatalyst" consists of carbon, hydrogen, sulfur and other nonmetal elements found in organic compounds. The application…https://www.hielscher.com/organocatalytic-reactions-promoted-by-sonication.htm
Dimethyl ether (DME) is a favourable alternative fuel, which can be synthesised from methanol, CO2 or syngas through catalysis. For the catalytic conversion to DME, potent catalysts are required. Nano-sized mesoporous catalysts such as mesoporous acidic zeolites, decorated zeolites or…https://www.hielscher.com/ultrasonic-preparation-of-catalysts-for-dimethyl-ether-dme-conversion.htm
Ultrasonication is a well-established process intensifying technique, which is used in many kinds of liquid applications such as homogenization, mixing, dispersing, wet-milling, emulsification as well as improving heterogeneous chemical reactions. If your production process is underperforming and does not achieve…https://www.hielscher.com/ramp-up-slow-and-insufficient-manufacturing-processes.htm
Electrolysis of dilute sulfuric acid produces hydrogen gas and oxygen gas. Ultrasonication reduces the diffusion layer thickness at the electrode surface and improves mass transfer during electrolysis. Ultrasonication can increase hydrogen gas production rates in the electrolytic cell, significantly. Two…https://www.hielscher.com/hydrogen-production-electrolysis.htm
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 give…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 magnesium…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 cannabinoid…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 ultrasonic…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 in…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 order…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, which…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 non-thermal…https://www.hielscher.com/maceration-and-aromatisation-by-sonication.htm