Trace amounts of CO were detected during the maintenance of the polypropylene reactor during analytical testing
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After ventilating the reactor in Daohua Chemical’s polypropylene production facility, chromatographic testing revealed slight excess levels of CO in the confined space, ranging from 10 to 100 ppm. The reason for this phenomenon is not yet clear; there is no CO present during normal operation of the system, as CO acts as a catalyst inhibitor – even trace amounts of it can terminate the reaction. It is suspected that some other substance is responsible for the analysis errors, as its peak occurrence time overlaps with that of CO. The chromatograph used is a Japanese Shimadzu JC2010 model； Or could it be that the residual substances in the powder react with oxygen to produce CO? I would appreciate it if experts could provide some guidance.
Could it be related to the chromatography column or detector used? Could you tell me the analysis conditions of the chromatograph used? If a mass spectrometer detector with low resolution is used, that chromatographic peak could be the peak of nitrogen.
Was it the CO injected into the system that caused it to die? Nitrogen is unlikely, as the nitrogen content is very high. Additionally, chromatography has little to do with the model used; it is mainly related to the column. And also, how to confirm it is carbon monoxide?
If the CO system is not isolated or disconnected with a blind flange, is it possible for it to enter through minor leaks in the valves?
It shouldn’t be separated; is it inseparable from argon?
It doesn’t necessarily come from the polypropylene plant itself; various tests can be conducted to find out. It is possible that errors in judgment occur due to interference with the chromatography itself. Don’t rely solely on one side’s evidence.
Add a certain amount of CO and check whether it cannot be separated from argon; generally, at levels of less than a few ppm, it is easy to separate them.