I have several questions regarding the issues that have arisen with loading n-butanol onto tank trucks, as well as the problems that occurred when trying to load xylene – the tests came back negative
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I would like to ask the experts: A tank truck previously transported n-butanol (with a density of 0.81 and a boiling range of 118–122°C) without cleaning the tank first; afterwards, xylene was loaded into it. Tests showed that the sample taken from the upper part of the xylene layer was normal, but the sample from the lower part had a boiling range of 120–143°C and a density of 0.850 (the normal boiling range for xylene is 138–143°C, with a density of 0.860). Initially, it was thought that residual n-butanol might be responsible for lowering the density and the initial boiling point, but some people said that n-butanol has a lower density than xylene. After a day of transportation with vibrations, the xylene, having a higher density, should have settled at the bottom of the tank truck, so this problem shouldn’t occur. Therefore, I would like to ask the experts here to help analyze whether what is said below is credible. If it indeed isn’t due to n-butanol, then what could be the cause? Thank you all first! ! !
Following. In such cases, loading is simply not carried out; experienced loading teams do exactly that.
This is a normal phenomenon. n-Butanol is miscible with xylene. The issue is the discharge port of the vehicle: simply pour out a bucket, then take a sample, and that’s it. This is caused by n-butanol.
1. The materials used for distillation range analysis must be pure; if they are not pure, the distillation range will definitely be incorrect, or it will not be possible to determine it within a certain range. 2. The xylene outlet stream may mix with unexhausted n-butanol, and a high concentration of this substance can lead to inaccurate results. 3. Xylene and n-butanol are miscible with each other, and when their concentrations are low, it has little impact on the properties of the substances