Enhancing catalyst productivity in gas phase polymerization
A catalyst and productivity technology, which is applied in the field of improving the operating performance of reactors in gas phase polymerization, and can solve problems such as the lower limit of density of 0.940g/cc that is not involved
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Embodiment 1
[0091] The HDPE laboratory-scale reaction is in a 2L stirred-bed catalytic reactor containing hydrogen (50 psi), ethylene (200 psi), hexane (inert hydrocarbon) and nitrogen (balance gas) at 85°C , With hydrogen and ethylene (H 2 / C 2 ) The gas phase molar ratio is 0.25. The amount of catalyst used is 45 mg, and the co-catalyst (TEAL) with an Al:Ti ratio of 50:1 was used in all experiments. The polymerization was continued for 1 hour. At this time, the raw material gas was stopped and the reactor was vented. figure 1 The rate of consumption of ethylene (which provides an indication of the rate of polymerization) in the one-hour reaction time derived from these HDPE tests is plotted in. This result shows that when the amount of hexane is increased to 50 ml, the productivity increases from 200 gPE / gCat without hexane to 575 gPE / gCat. Further increasing the hexane to 75ml pushes the productivity to over 3100gPE / gCat, which is more than 15 times that without hexane. These results ...
Embodiment 2
[0093] The effect of isopentane on the productivity of two different Ziegler Natta catalysts in the gas phase polymerization of HDPE in an industrial scale reactor (TSR) was also studied. The test was carried out in a 75L stirred-bed catalytic reactor similar to that described in EP0659773. The HDPE polymerization was carried out at 96°C in a reactor containing hydrogen, ethylene, isopentane as an inert hydrocarbon, and TEAL as a co-catalyst to obtain HDPE resin. The total reactor pressure was maintained to approximately 2100 kPa with nitrogen. Isopentane was injected into the reactor as a liquid, and the amount of isopentane was different in each experiment. The results are summarized in figure 2 in. figure 2 The data in supports the conclusion that for the two Ziegler-Natta catalysts, injecting isopentane into the reactor increases the catalyst productivity. The degree of productivity increase is different for different catalysts, but in both cases, the productivity incre...
Embodiment 3
[0095] Additional studies were conducted to demonstrate the effect of increased amounts of isopentane and the morphology of isopentane on the productivity and powders in TSR under HDPE polymerization conditions and in the presence of Ziegler Natta catalysts. The test was carried out in a 75L stirred-bed catalytic reactor similar to that described in EP0659773. The polymerization is carried out at 98°C in a reactor containing hydrogen, ethylene, a small amount of butene comonomer, isopentane as an inert hydrocarbon, and TEAL as a co-catalyst to produce HDPE resin. The total reactor pressure was maintained to approximately 2100 kPa with nitrogen. The test results are summarized in image 3 And they clearly show the effect of isopentane and isopentane phase (liquid vs. gas) on catalyst productivity. When isopentane is introduced into the reactor as a liquid, the effect on productivity improvement is greater than when it is introduced as a gas. For example, when gaseous isopentan...
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