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Polymerization process using a supported constrained geometry catalyst

A polymerization method and geometry technology, which are applied in the field of polymerization using supported catalysts with restricted geometry, can solve the problems of reducing catalyst efficiency and catalyst productivity, etc.

Inactive Publication Date: 2012-05-23
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduced catalyst efficiency and catalyst productivity occur when additive injections are not precisely matched in frequency and / or amount to prevent transients of reactor static which can herald unwanted "reactor outage events"

Method used

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  • Polymerization process using a supported constrained geometry catalyst
  • Polymerization process using a supported constrained geometry catalyst
  • Polymerization process using a supported constrained geometry catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0277] In the examples, supported metallocene catalysts based on constrained geometry metallocenes were prepared by the following steps as taught extensively in US Pat. No. 5,783,512 [(C 5 Me 4 SiMe 2 N t Bu)Ti(η 4 -1,3-pentadiene)], the catalyst is used together with a discrete borate ester activator.

[0278] To a 1 gallon mixing tank was added 0.92 kg of Davison 955 silica (commercially available from W. R. Grace & Co.-Conn., 7237 East Gage Ave., Los Angeles, CA 90040), which had been previously dehydrated at 200°C. 0.51 kg of dry hexane was added to the mixing tank, followed by 2.6 kg of 10 wt% triethylaluminum (TEAL) in hexane (-2.5 mmole TEAL / g silica). The slurry was mixed for approximately 2 hours, after which time the solid was filtered and washed with 4 1.6 kg portions of dry hexane. The resulting solid was dried overnight under nitrogen to yield 1.1 kg of TEAL-treated silica.

[0279] In a glove box under an inert gas atmosphere, dilute 303 mL of a 0.08 M solu...

Embodiment 2

[0281] The tests were carried out in the aforementioned polymer reactor using the aforementioned sCGC catalyst without any continuity additives. The sCGC catalyst is used to produce a film product with a melt index of about 1.0-1.2 and a density of 0.918-0.919. The reaction conditions during the operation of the reactor are: reaction temperature 80°C, ethylene concentration 44.7% by mole, moles of hexane and ethylene The ratio was 0.0037, and the hydrogen concentration was 1096 ppm. Static levels measured by static probes placed in the bed showed an increase in activity accompanied by a spike at negative polarities above 1200 volts, where the polymer precursors adhered to the reactor and triggered events such as figure 2 Crust shown.

Embodiment 3

[0283] In this test, the reactor was run under conditions similar to those described in Example 2 above, except that a continuity additive was used. The aforementioned continuity additive (mixture of aluminum distearate and ethoxylated amine type compound (IRGASTAT AS-990)), also called CA-mixture feedstock and sCGC catalyst was used to start up the reactor. The concentration of the CA mixture fed to the reactor was 13.2 ppmw based on production rate. like figure 2 As shown in , within 2 hours of starting the addition of the CA mixture cofeed to the reactor, the static level narrowed and the negative spike in the static reading disappeared. The reactor ran smoothly and no skinning or aggregation occurred.

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Abstract

A polymerization process includes contacting the following in a gas-phase reactor system under polymerization conditions for making a polymer product: a metallocene-based catalyst system including a supported constrained geometry catalyst, at least one monomer, and an additive selected from a group consisting of an aluminum distearate, an ethoxylated amine, and a mixture thereof. The additive may be selected from a group consisting of an aluminum distearate, an ethoxylated amine, polyethylenimines, and other additives suitable for use in the production of polymers for food contact applications and end products, including a mixture of a polysulfone copolymer, a polymeric polyamine, and oil-soluble sulfonic acid, in a carrier fluid, and mixtures thereof.

Description

technical field [0001] The present invention discloses a polymerization process using supported constrained geometry catalysts and additives to improve reactor operability. Background technique [0002] Skinning and caking are problems that have plagued industrial gas phase polyolefin production reactors for many years. The problem is characterized by the formation of solid lumps of polymer on the reactor walls. These solid agglomerates of polymer (skins) eventually fall off the walls and into the reaction section, where they interfere with fluidization, plug product discharge ports, and often force the reactor to be shut down for cleaning, any of these events One may be referred to as a "disruption event", which is usually a disruption of the continuous operation of the polymerization reactor. The terms "skinning," "caking," and / or "fouling," while used synonymously herein, can describe different manifestations of similar problems, which in each case can lead to reactor o...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F4/6592C08F2/34
CPCC08F10/00C08F2410/02C08F2410/01C08F210/16C08F4/65916C08F4/6592Y10S526/943C08F2/005C08F2/34C08F4/65908C08F210/14C08F2500/12C08F2500/08C08F2/44C08F4/52
Inventor D·F·侯赛因K·J·卡恩G·F·斯特克姆A·M·舍伯-沃尔特斯W·R·马里奥特J·M·法利M·D·奥
Owner UNIVATION TECH LLC
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