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Single Site Catalyst Polyolefin Polymerization Process

A catalyst, single-site technology, applied in the field of single-site catalyst polyolefin polymerization, which can solve the problems of uneconomical attractiveness and large investment of time

Active Publication Date: 2022-04-22
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This fouling tendency makes the use of metallocene catalysts economically unattractive in these systems due to the need to clean very large reactors after use, or to invest significant time and money in upgrading internal reactor surfaces to Prevents scale buildup

Method used

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  • Single Site Catalyst Polyolefin Polymerization Process
  • Single Site Catalyst Polyolefin Polymerization Process
  • Single Site Catalyst Polyolefin Polymerization Process

Examples

Experimental program
Comparison scheme
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Embodiment

[0055] It has been found that some metallocene catalysts supported on certain silica-based support structures do not require a pre-polymerization step to prevent particle breakdown. The metallocene precursor as part of the heterogeneous single-site catalyst is dichlorobis-dimethylsilyl-(4-(3',5'-di-tert-butyl-4'-methoxyphenyl) -2-methyl-indenyl) (4-o-biphenyl-2-hexyl-indenyl)zirconium, supported and using silica-supported methylaluminoxane (MAO) as an activator, and polymerized The reactor is a pilot scale continuous slurry reactor.

[0056] Supported MAO (sMAO) preparation: MAO was obtained as 30 wt% MAO in toluene solution from Albemarle (13.5 wt% Al or 5.0 mmol / g). In a 125 mL Celstir reactor, the silica was weighed and slurried into 6 times the amount of toluene (eg, 1 g silica, 6 g toluene). The silica slurry was stirred at 500 rpm to obtain a homogeneous mixture. MAO (30% in toluene) was added to the silica slurry very slowly to maintain the temperature above 40°C. A...

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Abstract

A method of polymerizing olefins is disclosed comprising delivering a heterogeneous single site catalyst to a solution or slurry polymerization reactor in the absence of prepolymerization, wherein the polymerization reactor is operated at a temperature of at least 50°C. The heterogeneous single site catalyst may be suspended and / or dissolved in a solvent selected from oils, aliphatic hydrocarbons and mixtures thereof. Furthermore, the heterogeneous single site catalyst may be conveyed to the polymerization reactor at a velocity greater than 1 m / s or 3 m / s.

Description

[0001] Inventor: Blu E. Englehorn [0002] priority statement [0003] This application claims priority and the benefit of USSN 62 / 412,902, filed October 26, 2016, and EP 16205789.7, filed December 21, 2016 and is incorporated by reference in its entirety. technical field [0004] The present disclosure relates to polymerization methods useful with single-site catalysts, and more particularly to methods of adding, injecting or otherwise delivering single-site catalysts to solution or slurry polymerization reactors. Background technique [0005] One of the greatest challenges in the development of novel catalysts is translating bench-scale success into commercial-scale implementation. Unlike laboratory trials, commercial reactors often present challenges in obtaining high catalyst activity without reactor upsets. One attempt to solve these problems has been to prepolymerize the catalyst with the monomers before the catalyst enters the main polymerization reactor or zone. F...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/38C08F2/04C08F10/06C08F4/6592C08F4/659
CPCC08F110/06C08F4/65912C08F4/65916C08F2420/07C08F4/65927C08F4/6492C08F2/14C08F2/01C08F2/02C08F210/16C08F4/6592
Inventor B·E·恩格霍恩
Owner EXXONMOBIL CHEM PAT INC