Olefin separation
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In the former depropanization process at Rums, why is there no liquid in the high-pressure depropanization reflux tank during startup?
There are various reasons for this issue; in my opinion, the main ones are: 1. Excessive nitrogen in the system, which prevents the propylene condenser from functioning properly. 2. Are the temperature and pressure of the propylene refrigerant within the required range? 3. Have the components at the top of the high-pressure tower been analyzed? There is too little C3 and too much C2; propylene at 7°C cannot be condensed. 4. Are the outlet pressure and temperature at the three stages of the reaction gas compressor appropriate?
It is likely that during operation the pressure at the compressor outlet did not reach the designed value; the C3 content in the feed mixture was low, resulting in no condensation