The issue of polypropylene not reacting after being added
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This post was last edited by psw1420 on 2010-12-13 at 20:52. I would like to ask the experts here for help in solving a problem: after feeding materials into our polypropylene plant, no reaction occurs; adding more of the third reagent still doesn’t trigger any reaction, and the quality of the propylene is around 99.0. Both the sulfur content and trace water levels are below the specified limits. The process is batch-type; what could be the reason for this? I haven’t handled this type of process before, so I’m seeking advice from everyone here
That being said, how should everyone discuss it? You have added the material and the reagent as well, but there is no reaction. Obviously, the reaction conditions have not been met. There are many factors: temperature, pressure, solvent, catalyst activity, initiator concentration and activity, as well as other influencing factors. If a reaction occurred simply by mixing the raw materials together, those who study manufacturing processes would have switched careers long ago.
What process does the poster use to add the additives and main components? Are the reaction conditions met – in terms of temperature, pressure, etc.? Is there a specific procedure for this?
It hasn’t reached the reaction conditions yet; let it reach those conditions first and then see. If it still doesn’t work, we can discuss what the reason might be
This post was last edited by Wutongshu on 2010-12-14 03:32. Hehe, no – the water temperature is 70 degrees, the temperature of the reactor is 50–60 degrees, the amount of activator used is 3.5 mL, the amount of catalyst used is 270 kg; it’s a batch batch-process method
Have you seen that the temperature of the reaction vessel isn’t required to be 80 degrees? The reaction is more complete. Looking at it later, I see that your activator is 3.5 ML, but the catalyst amounts to 270 KG? Isn’t there too little activator? Appropriately increase the TEAL content. The water content must be too high.
It won’t fail to respond even at low temperatures; it’s likely a problem with the raw materials. Many installations have encountered this issue. Find a place to analyze your raw materials – it’s not necessarily a water-related problem
It’s likely still a problem with the raw materials; the purity of propylene is only 99%. If the levels of water and sulfides are within acceptable limits, conduct a comprehensive analysis to check for other impurities. It’s not just sulfur that can poison the catalyst – CO and other substances should also be taken into consideration.
Hey, I work with polypropylene; I’ve been in this field for over a decade now, and I’m also working with continuous-process methods. Have you analyzed your raw materials? Please share the basic data so that we can help analyze it for you. You’re using 270 KG of catalyst and 3.5 ML of activator – that’s quite a lot!
Is Nanshansong always from Ningxia Petrochemical?
The purity requirement for propylene is >99.6%; it may be a problem with the raw material, so analysis is recommended. Also: You’ve got the units for your data wrong – how is it possible to have 270 KG of catalyst and 3.5 ML of activator?