What should be considered when determining the vacuum distillation range of heavy fractions such as wax oil?

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When determining the vacuum distillation range of heavy fractions such as wax oil, the following points should be noted: 1. All connections in the vacuum distillation apparatus must be extremely tight to ensure good airtightness. Throughout the entire measurement process, the residual pressure is kept as constant as possible. 2. To ensure uniform boiling of the sample and prevent splashing, glass fibers can be added to the bottle, with their height being 4–5 millimeters above the liquid surface. 3. The distillation flask must meet the specified standards and must not have any cracks; otherwise, it will ruin the entire distillation process and may even cause a crushing explosion. 4. When measuring the vacuum distillation range of kiln paraffin oil, it is possible to warm the branch tube of the distillation flask using appropriate methods before the initial distillation begins; this prevents paraffin from depositing, allowing the paraffin-containing distillates to melt promptly in the receiving cylinder. 5. When performing vacuum distillation, safety glasses or a protective face shield should be worn to prevent accidents.