Questions regarding the polypropylene double-loop tube process
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I would like to ask everyone: in the polypropylene double-loop pipe process, from FV231 to the bottom of D202, there are two lines; one of them is XV232, which is the line used during normal operation； The other one is XV231, which leads directly to D202. I would like to ask when the XV231 line will be used and what its function is Thank you!
When producing special grades, D202 is used; that’s what we say here. It seems to be necessary to use it when the reaction pressure is above 4
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It is supposed to be used in the production of high-stiffness polypropylene. During such production, a large amount of hydrogen is added to the loop reactor; to prevent hydrogen from separating out from the liquid propylene, it is necessary to raise the pressure in the loop reactor to around 4.5 MPa. At this time, the increase in hot gaseous propylene entering D202 via E203 may cause the temperature of D202 to rise; therefore, it is necessary to allow the cold liquid propylene from the feed line to enter D202 in order to prevent an increase in its temperature.