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| Ceralink, Inc. Rensselaer Technology Park 105 Jordan Road Troy, NY 12180 Phone: 518 283-7733 Fax: 518 283-9134 
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Microwave Chemistry Microwave Chemistry has become standard laboratory practice for digestion and synthesis. One of the main advantages of microwave chemistry is the dramatic reduction in reaction time. Increased yields and safer application of heat are other important advantages. How it works: The microwave energy directly interacts with the solvent(s) used in the reaction. The solvents can be heated through dipolar polarization, conduction mechanisms, or interfacial polarization. A good overview of the different types of heating can be found at http://www.tan-delta.com/. The reaction vessels are generally PTFE (Teflon), which is microwave transparent and can withstand working temperatures up to 200 ºC. The microwaves do not directly interact with the vessel, but heat the contents within. This allows the vessels to be sealed in order to contain pressure generated within the vessel. Closed digestion or synthesis vessels are similar in concept to a pressure cooker, where the reaction solvents can be heated to a temperature above their boiling point. Superheating the contents under pressure allows for faster reactions times. Some researches had also reported new reactions, generating compounds that are not formed in conventional processing. Applications: The two main applications for microwave chemistry are digestion and synthesis. Digestion is a method to leach, or selectively leach a material or element. Microwave digestion is widely used in sample preparation, especially for ICP (inductively coupled plasma). Take a look at our Example Project (mw chem.). Microwave synthesis is the reaction of two or more solvents to produce a desired material. Microwave synthesis is being used extensively in the pharmaceutical industry for drug discovery.
Equipment: Take a look at the microwave digestion unit in
Ceralink’s Microwave Testing Center. One of the challenges
faced after developing a great microwave chemistry process is, How
Do I Scale It Up? There has been some activity in this area as the
demand for scale-up equipment increases. To date, a couple pieces
of scale-up (moving from 30 ml to 3L) one from Ceralink Inc, developed
to meet the need of one of our clients, and also the Ultraclave
from Milestone. One of the important factors in scaling a microwave
chemistry process is to be able to retain the same advantages enjoyed
at the lab-scale. Ceralink works with autoclave manufacturers to
design and build a microwave reactor that will most benefit your
process. Some suppliers of lab-scale microwave chemistry equipment are: |
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