The propylene stream exiting the gas phase contains a high level of water
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Recently, the polypropylene unit in our plant has been reporting serious water contamination in the raw material (propylene) – it’s not clear whether this is true or not. On the other hand, the catalytic cracking liquefied gas purification unit and the gas separation unit carry out dehydration processes on a regular basis. Could it be that the effectiveness of the dehydrators used is insufficient? Do you have any good suggestions? Which manufacturer produces the best coalescers? Thank you.
From a process perspective, it is impossible for propylene to contain water.
First, enhance the dehydration of the upstream unit； Second, check the condition of the propylene drying system.
Generally, water is not included. If there is a high water content, it’s necessary to check whether the aftercooler is functioning properly; another thing to consider is whether the operations in the polypropylene plant’s refining section are operating as they should. It’s also important to check the condition of all the heat exchangers in the gas separation unit. Usually, the water is removed thoroughly already in Tower 2. We have encountered such situations before, but that was during the initial stages of operation. Could you explain the process flow in more detail? Everyone’s help would be appreciated.
Enhancing the dehydration in the deethanizer reflux drum ensures that no condensed water is present in the propylene product.
Propylene generally does not contain water, unless there is a leak from the cooling unit of the propylene plant; it is recommended to conduct a thorough inspection
The established dehydration procedures must be strictly followed in terms of manufacturing processes. I’m not sure if the person asking this question works at a refinery in the north; if so, care should be taken to ensure that the sampling tubes are dry when collecting propylene samples The tube can be removed and placed inside the building; it is taken out again when sampling, and blown dry with an industrial blower to ensure the sampling tube remains dry. If this still doesn’t work, it’s likely that your acrylic sample does indeed contain water; you can check whether there are any leaks in the cooling equipment
I don’t understand; how is it possible not to bring water? How can liquefied gas be used without water? Also. A cooler leak is impossible, as the circulating water pressure is relatively low. The maximum is 6 kilograms, and the minimum tower pressure in the gas handling system is also above 10 kilograms. How can there still be those who say it’s impossible to draw water? Have the designers of the coalescer lost their sense? Thank you for your participation; we earnestly request an analysis. This post was last edited by 505WWB on 2008-11-19 09:24.]
There is a high possibility of leakage in the heat exchanger
In our facility, a leak occurred in the heat exchange water reboiler of the heat integration system, which resulted in water being carried along with the propylene； For other reasons, propylene should not contain water.
Bring water and start the drying tower! There shouldn’t be any water left!