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In winter, the environmental temperature in the north is extremely low, with outdoor temperatures dropping as low as -30°C. In vinyl chloride production systems, it is difficult to meet the specified requirements for measuring the acetylene content in the two sets of converters (C2H2 ≤ 2.5%) and in the two sets of main pipelines for crude VC (C2H2 ≤ 2.0%). At normal flow rates, especially when the outdoor temperature is below -20°C, it is almost impossible to achieve the required standards for measuring the acetylene content in these pipelines. Replacing the catalysts in the converters continuously does not yield significant results. However, the acetylene content in the distillation off-gases remains below 15%, which suggests that the crude VC should meet the specifications according to calculations and historical data. As is well known, the boiling point of vinyl chloride at normal pressure is -13.9 degrees Celsius. In winter, when the outdoor temperature is low, the vinyl chloride gas condenses inside glass syringes or bulb-shaped containers after sampling. If these containers are taken back indoors and left there for a short period of time, the vinyl chloride gas does not have time to fully evaporate, resulting in a higher volume percentage of acetylene in the sample. This is presumably how it works; once the temperature rises above -10°C, the condition of both the converter and the crude VC sample will improve significantly. I am seeking advice from experts on how to carry out effective detection of vinyl chloride gas in winter, in order to minimize errors. Are there any good solutions? I’d appreciate it if you could share your experience.