The primary problems with short path distillation include its high cost, the requirement for high sealing performance to maintain system pressure, and the potential for loss of extracted gas solvents due to the short distance between the evaporating and condensing surfaces.
High Cost: Short path distillation equipment is generally more expensive than traditional distillation equipment. This higher cost is primarily due to the need for high sealing performance to create and maintain the vacuum necessary for the distillation process. The intricate processing required to achieve this sealing performance makes the equipment challenging and costly to manufacture.
Requirement for High Sealing Performance: To maintain a high degree of vacuum, which is essential for the effectiveness of short path distillation, the equipment must have a high level of sealing. This requirement not only increases the cost but also makes the equipment more complex and potentially more prone to failure or leakage, which could compromise the efficiency and effectiveness of the distillation process.
Potential for Loss of Extracted Gas Solvents: In short path distillation, the distance between the evaporating surface and the condensing surface is very short. While this is beneficial in terms of reducing the residence time of the compounds and preventing degradation, it also means that the extracted gas solvents can easily be lost if not properly managed. The short distance can lead to incomplete condensation or loss of these solvents, which could result in a less pure final product and potentially higher operational costs due to the loss of valuable materials.
Despite these challenges, short path distillation remains a valuable technique for the separation of high boiling point, heat-sensitive, and easily oxidized materials, offering benefits such as lower operating temperatures and shorter residence times for the materials being processed. However, the issues of cost, sealing requirements, and potential solvent loss must be carefully managed to ensure the process is both efficient and effective.
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