Questions about the boiling range
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I have a question and would like to ask everyone for advice. The laboratory has received a blind sample that requires a distillation range analysis, and it possesses an automatic distillation range analyzer. For determining the boiling range of blind samples, it is required to comply with the D86 method. What ideas do everyone have? My idea is to determine the density and use gas chromatography to analyze the composition in order to identify the components. However, I’m not quite sure how to write a proper program based on that composition. Does anyone here have experience with determining the distillation range of blind samples? Please help answer this question. Thank you.
By the way, it’s the US standard D86 method
You can use a simple glass apparatus to perform the following distillation range.
The key factors are the asbestos pore size, heating rate, final boiling point, and the detection of the dry point; I don’t have any ideas at the moment. Who has done blind distillation range testing? Share your approach, haha! Thank you
The last edit to this post was made by *eyi101300 on 2011-10-8 at 21:48. For automatic instruments, it is mainly necessary to set the temperature range prior to the onset of the initial distillation; moreover, it is important to know which category of oil it falls under according to GB6536, as this determines the sampling temperature, the pore size of the asbestos filter, and the time required for initial distillation. The final distillation point and the dry point are determined automatically. There is no need to do the composition at all.
If your distillation apparatus is a qualified instrument, follow the procedures. What does a blind sample matter? Trust in yourself!
The simplest way is to use glassware first and then you’ll know
Reply to 1# liuyu682: I think the original poster is right. First, it’s necessary to determine the density, and also to check the viscosity of this oil in order to figure out which category it belongs to and what stage it is in (for example, if its density is similar to that of diesel, etc.). This will help determine which analysis procedures are appropriate for this type of oil. The temperature of the condenser should be set based on the viscosity. After that, manual instruments can be used for analysis based on these conditions; once the various procedures have been determined, it’s better to use automated equipment.
Just do a rough estimate first, and you’ll know.
Reply to 5# *eyi101300: So how can we determine the temperature before the initial boiling point? What is the basis?
It is possible to measure the density and viscosity; if there is enough sample, an approximate estimate can be made to determine the approximate initial and final boiling points.