VC polymerization
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The current method for PVC production is liquid-phase polymerization; it is conceivable that VCM could be polymerized in a gas phase, which would save the subsequent conversion processes
Even if vinyl chloride is polymerized in the gas phase, there may still be problems, such as the purification of vinyl chloride, because what comes out of the conversion process is only crude vinyl chloride, which contains too many impurities to be used in PVC production.
The gas-phase polymerization capacity of VCM is too low, and all additives must be in gaseous form.
There is an issue of theoretical innovation in aggregation here! Current theory suggests that VCM polymerization is a liquid-phase free-radical polymerization. I really haven’t heard of gas-phase polymerization.
I hope it’s possible in the future, but with so many impurities present right now, there’s no solution yet! Good idea! :lol
I guess the PVC that results from this will be in pieces, just like the peeled skin of a pomelo: lol
Perhaps we can broaden our thinking a bit; for example, PP refers to continuous gas-phase polymerization, and the main reason is that no companies are currently investing much effort in developing this technology.
PVC vapor polymerization is carried out by manufacturers in China. However, the heat removal issue in gas-phase polymerization is difficult to resolve, resulting in low yields
Gas-phase polymerization requires a large amount of space, it’s difficult to control heat dissipation, and most importantly, the yield is low! Unless there is a way to shorten the gas-phase polymerization time
It was mentioned above that domestic manufacturers use gas-phase polymerization to produce PVC; I wonder which company it is