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Polymerization Process

A polymerization method and polymer technology, applied in the field of polymerization, can solve the problems of increasing the melt index and reducing the density of the polymer.

Active Publication Date: 2018-02-02
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it would be desirable to be able to expand the polymer-level operating window to produce polymers at higher production rates with different properties, for example, reducing the density of the polymer or increasing its melt index, which is clearly not feasible with current commercial practice. Possible due to limitations of process conditions and easy access to ICA

Method used

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Examples

Experimental program
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Embodiment 1

[0086] Differential Scanning Calorimetry (DSC) tests were performed on PE particles in contact with isopentane or 2,2-dimethylpropane.

[0087] For each polymer evaluated, only the first melt DSC was used, as this was believed to be more representative of the polymer as it existed in the reactor compared to the more conventional second melt DSC curve. The second melting DSC curve can differ significantly from the first melting DSC curve, typically showing a lower peak melting temperature and a sharper melting peak.

[0088] In the data in Table 1 below, a DSC curve was generated using a ramp rate of 10°C / min. The DSC device is TAInstruments Q200. PE particles are hexene-ethylene copolymers with an initial MI of 1.0 dg / min (ASTM D-1238) (190°C / 2.16kg) 2.1 , MI of 34dg / min (ASTM D-1238) (190℃ / 21.6) 21 and a density of 0.920g / cc (ASTM D-4703). To reduce experimental scatter, the granules were then sieved so that the granules were retained on 35 mesh for DSC testing with isope...

Embodiment 2

[0095] This example compares DSC first melt data for samples with similar amounts of ICA. These data are presented as two data points included in Table 1. Raw material, equipment and process are all identical with embodiment 1. 2,2-Dimethylpropane corresponds to a 0.444 wt fraction, which represents a significantly higher melting point and MIT compared to the 0.451 wt fraction of isopentane, as figure 2 shown.

Embodiment 3

[0097] These examples simulate reactor operation using various ICAs. The simulation was performed using the method shown in column 62, line 48 through column 69, line 51 of U.S. Patent No. 7,683,140. These examples use raw materials of the same physical properties as the aforementioned patents. These examples also use the same exemplary calculations used in U.S. Patent No. 7,683,140 (see Table 3 at Col. 69). These examples demonstrate ΔMIT. Table 2 shows the full set of solubility parameters used in these examples.

[0098] Table 2: Solubility parameters ((cal / cm 3 ) 1 / 2 )

[0099] n-butane

7.062

Isobutane

6.853

n-pentane

7.055

Isopentane

6.771

2,2-Dimethylbutane

6.382

1-Hexene

7.352

polyethylene

7.95

[0100]Once the recycle gas concentration is fixed, the heat removal capacity of the recycle gas loop is usually calculated based on achieving a target value for ΔMIT. For illustrative purposes, ...

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Abstract

A process including contacting one or more monomers, at least one catalyst system, and a condensing agent including a majority of 2,2-dimethylpropane under polymerizable conditions to produce a polyolefin polymer is provided.

Description

[0001] priority [0002] This application claims the benefit of Serial No. 62 / 158,736, filed May 8, 2015, the entire contents of which are hereby incorporated by reference. field of invention [0003] The present disclosure relates to polymerization processes for the preparation of polyolefin polymers. In particular, the present disclosure relates to gas phase polymerization processes using certain condensing agents. Background of the invention [0004] The condensing mode of operation in a gas phase polymerization reactor significantly increases the production rate or space-time yield by providing additional heat removal capacity via evaporation of condensate in the cycle gas. Additional condensation is often promoted by adding an inert condensing agent ("ICA") to the reactor to extend the usefulness of condensing mode operation. The most commonly used ICAs in commercial practice are n-pentane, isopentane, n-butane, isohexane and isobutane. However, the amount of ICA tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/14C08F2/34C08F2/00
CPCC08F2/34C08F210/16C08F2/002C08F2500/12C08F210/14C08F2/38C08F2/44C08F2500/18C08F10/02C08F4/24C08F4/52C08K5/01C08L23/0815C08L2314/02C08L2314/06C08L2314/08
Inventor D·J·桑德尔M·L·迪切里斯F·D·赫曼
Owner EXXONMOBIL CHEM PAT INC
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