GB/T 17475-2020 Standard test method for distillation of heavy hydrocarbon mixtures—Vacuum potstill method

Scope

This standard specifies the method outline, instruments, sampling, instrument preparation, test steps, result calculation, reporting, precision, and deviations for the distillation of heavy hydrocarbon mixtures using the vacuum kettle distillation method.
This standard applies to the distillation process of heavy hydrocarbon mixtures such as heavy crude oil, petroleum fractions, residual oils, and synthetic oils with a boiling point of more than 150℃ and less than 565℃. The preparation of samples for crude diesel and lubricating oil fractions can be carried out in accordance with this standard. This standard can also be used to prepare residual oils for asphalt production, but it is not always suitable. The long-term thermal cracking that occurs during this test may change some of its properties.
Note 1: The maximum cutting temperature is related to the heating limit of the sample. For most samples, 565℃ is the maximum cutting temperature that can be achieved, but for heat-sensitive samples, the maximum cutting temperature will be significantly lower than 565℃, and similarly, for heat-insensitive samples, the maximum cutting temperature may be slightly higher than 565℃.
Note 2: The distillation of crude oil before the cutting point of 400℃ can also use the test method specified in GB/T 17280. However, the distillation curves and fraction properties obtained using this standard cannot be directly compared with those obtained using this standard.

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