Zone Refining
Source: Design Scientific, Inc.
Throughout history, chemists have used the power of crystallization
Throughout history, chemists have used the power of crystallization to enhance the purity of chemicals. Int the 1950's, a process called zone refining or zone melting was developed that improved fractional recrystallization. This method, though effective, was very slow and required a great deal of attention. Now, the Purifier 10 Zone Refiner has improved this time-tested method to offer an instrument that is faster, easier to use, more versatile and cost effective.
In zone refining, a short molten zone travels slowly through an elongated sample of a crystalline material. A molten zone traversing a solid sample has two liquid-solid interfaces: a melting interface and a freezing interface. At the melting interface the composition does not change but at the freezing interface, the impurities favor the liquid phase because the crystal structure through the sample many times concentrates the impurities at one end thereby purifying the sample.
Design Scientific, Inc., 4282 Pillsbury Road, Gainesville, GA 30507. Tel: 770-536-6195; Fax: 770-536-9261.
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