The vacuum pressure for short path distillation typically operates in the range of 1 to 0.001 mbar. This low pressure is crucial for reducing the boiling temperature of heat-sensitive materials, allowing for their separation without degradation.
Detailed Explanation:
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Reduction of Boiling Temperature: In short path distillation, the use of vacuum significantly lowers the boiling point of substances. This is essential because it allows the distillation of high molecular weight organic components and heat-sensitive materials that would otherwise break down at higher temperatures. The typical operating pressure range of 1 to 0.001 mbar ensures that the boiling temperatures remain low, often below 200°C, which is critical for preserving the integrity of the materials being processed.
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Gentle Thermal Treatment: The low pressure environment in short path distillation provides a gentle thermal treatment for high boiling and heat-sensitive products. The short path evaporator, which includes a cylindrical body with a heating jacket, a rotor, and an internal condenser, is designed to facilitate this process. The short residence time (tens of seconds) further contributes to the gentle treatment of the materials, minimizing thermal degradation.
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Ideal for Heat-Sensitive Compounds: The vacuum pressure used in short path distillation makes it an ideal method for distilling compounds that are unstable at higher temperatures. By reducing the boiling point through vacuum, the process can be completed at lower temperatures, ensuring that the compounds do not undergo thermal decomposition or other forms of degradation.
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Maximum Vacuum Degree: The maximum vacuum degree that short path distillation can achieve is 0.098 MPa (or 0.001 mbar), which is the lowest end of the operating pressure range. This extreme vacuum level is necessary for processing particularly heat-sensitive materials, ensuring that the boiling temperatures are as low as possible to prevent any thermal damage to the compounds.
In summary, the vacuum pressure in short path distillation plays a critical role in enabling the separation of heat-sensitive and high molecular weight organic compounds without causing thermal degradation. The operating pressure range of 1 to 0.001 mbar is tailored to achieve this, with the lower end of the range being particularly useful for the most sensitive materials.
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