How to sample C4
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There is currently a distillation unit for separating C4 and C5 at a pressure of 7 kilograms. Carbon tetrahydrocarbon analysis needs to be conducted at the top of the tower; sampling is planned to be carried out at the outlet of the reflux pump. The fluid in the pipeline is in liquid form, but it vaporizes once sampled. What type of valves are required for sampling? Are pressure regulators and needle valves necessary? Can the resulting gas be collected using a sampling bag?
Vaporization makes it unrealistic; to maintain this pressure, it’s better to use a sampling cylinder for sampling. A company in Switzerland seems to do this pretty well.
Sampling is done using ordinary pressure-resistant bottles; the full composition can be analyzed with a pressure-resistant needle, or the gas phase can be analyzed after vaporization. It depends on the requirements regarding the components you have – I have been doing this work for a long time.
The analysis results after gasification are estimated to differ from those in the liquid phase; it is better to use pressurized liquid samples.
Use gas sampling steel products for sampling and analysis； A pressure-resistant cylinder can also be used, with a small amount of solvent added inside the lining tube. This needs to be chosen based on your instruments and methods
A sampling cylinder can be used; it’s made of 316L stainless steel and is available for purchase online – it’s a cylinder designed for sampling liquefied gas