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Hielscher offers a range of ultrasonic devices with manifold accessories for the fast preparation of samples in the lab.

Heat is required for most chemical reactions heat is required and such reactions proceed approximately twice as fast with a temperature increase of 10C to 15C.

In the last few decades, the range of possibilities for heat input into liquids has been somewhat amplified.

Besides the traditional heating techniques, microwave and ultrasound technology have become established means.

While all of these forms of energy result in heating, physical and chemical reactions are observed during only a few of these heating processes, so that they can be used for specific applications.

If ultrasonic irradiation is applied on liquids, this kinetic energy is converted by friction partly into heat.

But if amplitude and acceleration are high enough, the phenomenon of cavitation occurs.

The liquid bursts and vacuum bubbles are generated during the alternating high-pressure and low-pressure cycles.

When these small bubbles cannot absorb more energy, they implode during a high-pressure cycle, so that pressures up to 1,000 bar and shock waves as well as liquid jets of up to 400km/h are reached locally.

These intense forces, caused by ultrasonic cavitation, take effect to the enclosing droplets and particles.

The main objective of power ultrasonics consists of cavitational forces, the heating is mostly a welcome side-effect.

Cavitation and the effects described above cause interparticle collision.

Existing bondings are broken, particles are dispersed and deagglomerated, then a new bond can be formed.

By the very fine, intensive mixing and dispersing of particles and droplets, the reaction time is significantly reduced.

The larger the overall surface area of all reacting particles will be, the faster and more efficient a process will run.

This is achieved by the particle size reduction and breakup of agglomerates in suspensions or by the shearing of droplets in emulsions.

With ultrasonication, particles and droplets in the micron and nano-size can be easily achieved.

A further effect of ultrasonic irradiation is the permanent cleaning of the catalysts, so they offer a larger active surface area whereby the amount of added catalyst can be reduced.

Besides the increased catalytic speed, ultrasonication also initiates reactions that can be by input of other energy forms not achieved or can be just hardly obtained.

In the last few years, Hielscher has intensively investigated and developed ultrasound technology and its applications so that the German company is capable to offer customers a broad range of ultrasonic processors for applications in lab and industry.

This experience of ultrasound technology allows Hielscher Ultrasonics to advise customers regarding the manifold sonochemical reactions, such as precipitation, homogeneous and heterogeneous catalysis, crystallisation, sonochemistry of polymers, or transesterification of oil and fat to biodiesel.

In the lab, the reduction of processing time and costs is an important factor, as well as a fast supply of analysis results.

For the quality control of production processes it is important to react to fast analysis results as promptly as possible.

According to these requirements, Hielscher offers ultrasonic devices with manifold accessories for the fast preparation of samples in the lab, such as the handheld or stand-mounted homogenisers or the recirculating Sonostep, as well as the inline sonication of large volume streams for industrial production.

For example, Hielscher’s benchtop processor UIP1000hd (1,000W, 20kHz) can sonicate liquids in flow mode with a flow rate between 0.5 and 4.0 litres/min, depending on the specific process.

Hielscher’s UIP16000, a powerful ultrasound device, processes between 12 to 50m/hr.

All industrial devices are said to be easy to handle and to operate; they are built at full industrial grade and can be operated 24 hours per day.

As the ultrasonic units can be installed as clusters, there is virtually no processing limit.

While the energy consumption of lab applications is mostly negligible, it is a considerable factor in industrial processing.

Therefore, high efficiency and process optimisation are essential.

Ultrasonic processes can be scaled linear from lab or benchtop size up to any size of production process.

Only the required ultrasonic power correlates linearly with the processed volume stream and will be realised by the number of Hielscher’s ultrasound equipment; all other parameters are completely constant.

Hielscher supplies turnkey systems consisting of ultrasound generators, transducers, sonotrodes, flow cells, electronic controls, sound protection and explosion proofing (as needed).

The effectiveness in booting chemical effects and the various possibilities of sonochemical applications make ultrasound a useful technology in the lab as well as in industry.

Hielscher Ultrasonics is worldwide known as top supplier for innovative ultrasonic devices from lab homogenizers to industrial processing reactors. Typical applications include, mixing and homogenizing, grinding, dispersing & emulsifying, extraction, lysis & disintegration as well as sonochemistry.

Covering this wide range of applications, Hielscher’s ultrasonic devices are successfully used in almost every liquid processing industry: Dispersing and wet-milling of particles in the ink, paint and coating sector; processing of nanomaterials, i.e. to precipitate or functionalize nano-size particles; ultrasonic mixing for the biodiesel production; sonochemistry and sonocatalysis to improve chemical reactions; lysis, fermentation and digestion for biological applications; homogenizing, extracting and pasteurization for food processing; or ultrasonic cleaning for endless materials, such as wire, cable, rods, tapes or tubes. Ultrasonic devices made by Hielscher are used for lab samples, pilot scale processing, process optimization and full scale production.

This includes ultrasonic devices for the ultrasonication of any liquid volume, from several microliters through hundreds of cubicmeters per hour. For more information, please visit Hielscher’s website: www.hielscher.com  

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