When analyzing the components of LNG (mixtures), how are these two methods applied, and how is the experimental setup designed?
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When analyzing the components of LNG (mixtures), it is important to pay special attention to obtaining representative samples in order to avoid inaccurate analysis results caused by distillation effects. The most commonly used analysis method involves analyzing a small portion of the products obtained from continuous evaporation, with a specially designed apparatus being used to provide a representative gaseous sample of the liquid without any distillation. Another method is to take samples at the outlet of the distiller where the main product is produced. This sample can be analyzed using conventional gas chromatography methods, such as those described in ISO6568 or ISO6974. Question: 1. What is the distillation effect? Why does the distillation effect affect the analysis results? 2. Is there a device for actual LNG analysis? Samples are taken at the distiller’s outlet; aren’t the samples produced by distillation? Is there no distillation effect? 3. What is the difference between samples produced by continuous evaporation and distillation? 4. What are ISO6568 and ISO6974 specifically?
I only know that evaporation should be controlled continuously before proceeding to chromatography, but I disagree with using chromatography to analyze the S content! Unless a device is added.