Process for Olefin Polymerization
A polyolefin and olefin monomer technology, applied in the field of reaction systems, can solve the problems of dome flakes and agglomerates, particle accumulation, etc., and achieve the effect of uniformity improvement
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[0202] The following examples demonstrate the role of TRRA;
[0203] These examples show that TRRAs such as esters, amines, nitriles, amides and mixtures thereof, especially ethyl p-ethoxybenzoate (PEEB), trimethylacetonitrile (TA) and n,n-dimethylbenzyl Amides (DB) are able to reduce the catalyst activity (and thus control the temperature in the expansion section) without affecting the properties of the polyolefin produced.
example 1
[0204] Example 1. TRRA is PEEB
[0205] The polymerization catalyst was prepared as follows:
[0206] Example 1: Preparation of procatalyst on activated butyl-Grignard support.
[0207] Preparation of Grignard reagent (step o)) - stage A
[0208] This step o) constitutes the first part of stage A of the process for preparing the procatalyst.
[0209] A stirred flask equipped with a reflux condenser and funnel was charged with magnesium powder (24.3 g). Place the flask under nitrogen. Magnesium was heated at 80°C for 1 hour, after which dibutyl ether (150ml), iodine (0.03g) and n-chlorobutane (4ml) were added sequentially. After the color of iodine disappeared, the temperature was raised to 80° C. and a mixture of n-chlorobutane (110 ml) and dibutyl ether (750 ml) was added slowly for 2.5 hours. The reaction mixture was stirred for a further 3 hours at 80°C. Stirring and heating were then discontinued and a small amount of solid material was allowed to settle for 24 h...
example 2
[0256] C-donor means: cyclohexylmethyldimethoxysilane.
[0257] N-donor means: n-Propyltrimethoxysilane
[0258] The polymerization catalyst was prepared as described in Example-1. Similar procedures and equipment used in Example-1 were used in this example for molecular weight distribution (MWD) using GPC and crystallinity using ATREF.
[0259] The effect of different TRRA / Si ratios on yield for both TA and DB is shown in Table 4 below:
[0260] Table 4. Yield versus TRRA / Si molar ratio for TA and DB at 67°C and 82°C.
[0261]
[0262] Table 4 shows the yield for TA at different molar ratios of TRRA to electron donor (TRRA / Si). The addition of TA showed almost similar degrees of inactivation at both temperatures, where when benchmarked with zero TA at 67°C, the activity drops were −43% and −67% at 67°C and 82°C, respectively . Therefore, TA is preferably used as one of the components in a mixture with another TRRA. Table 4 also shows the yield for DB at different mol...
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