Short path distillation typically operates within a vacuum pressure range of 1 to 0.001 mbar.
This low pressure is essential for reducing the boiling temperature of heat-sensitive materials.
It allows for their separation without causing degradation.
Detailed Explanation:
1. Reduction of Boiling Temperature
In short path distillation, the use of vacuum significantly lowers the boiling point of substances.
This is crucial because it enables the distillation of high molecular weight organic components and heat-sensitive materials.
These materials 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, these temperatures are below 200°C, which is critical for preserving the integrity of the materials being processed.
2. 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.
This minimizes thermal degradation.
3. 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.
This ensures that the compounds do not undergo thermal decomposition or other forms of degradation.
4. Maximum Vacuum Degree
The maximum vacuum degree that short path distillation can achieve is 0.098 MPa (or 0.001 mbar).
This is the lowest end of the operating pressure range.
This extreme vacuum level is necessary for processing particularly heat-sensitive materials.
It ensures 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.
The lower end of the range is particularly useful for the most sensitive materials.
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