Catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof

A gas-phase polymerization and catalyst technology, applied in the field of bimetallic silica gel carrier catalyst composition and preparation thereof, can solve the problems of narrow molecular weight distribution of polyethylene resin, difficulty in achieving complete and uniform blending of resin, affecting the final performance of resin, etc.

Active Publication Date: 2014-10-01
PETROCHINA CO LTD
View PDF15 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to mix resins with different molecular weights in a molten state. This method is not only costly, but also difficult to achieve complete and uniform blending of the resins, which affects the final properties of the resins;
[0004] (2) By performing staged polymerization in multi-stage reactors, a relatively uniform resin can be obtained, and the operation and adjustment flexibility is relatively large, but there are problems affecting efficiency and high cost;
[0008] Chinese patent CN101225129A discloses that a composite catalyst composed of two late transition metals iron and nickel is used to prepare bimodal polyethylene, but the required cocata

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof
  • Catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof
  • Catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0045] Example 1

[0046] Preparation of bimetallic catalyst composition:

[0047] (1) Weigh 20g of spherical silica gel (produced by Grace Company in the United States, with an average particle size of 45μm and a specific surface area of ​​350m 2 / g), put silicon dioxide in a gas-phase fluidized bed activator, blow and fluidize it with anhydrous and oxygen-free nitrogen, gradually raise the temperature to 600°C, and dehydrate at constant temperature for 6 hours to obtain dehydrated silicon dioxide.

[0048] (2) Add 100mL of isopentane to a reaction flask with a stirrer under nitrogen protection, add 10g of silica gel after thermal activation treatment in step (1) and 5.6mL of AlEt with a concentration of 1mmol / mL 3 Add the hexane solution, react at 20-30°C for 1 hour, heat to evaporate the alkane solvent, and obtain fluid activated silica.

[0049] (3) In another reaction flask with a stirrer, add 0.64mL TiCl 4 , 2,6-bis[1-(2,6-dimethylbenimine)ethyl]pyridine ferric dichlo...

Example Embodiment

[0054] Example 2

[0055] Preparation of bimetallic catalyst composition:

[0056] (1) Weigh about 20g of spherical silica gel (produced by Grace Company in the United States, with an average particle size of 45μm and a specific surface area of ​​350m 2 / g), put silicon dioxide in a gas-phase fluidized bed activator, blow and fluidize it with anhydrous and oxygen-free nitrogen, gradually raise the temperature to 600°C, and dehydrate at constant temperature for 4 hours to obtain dehydrated silicon dioxide.

[0057] (2) Add 100mL of isopentane to a reaction flask with a stirrer under nitrogen protection, add 10g of silica gel after thermal activation treatment in step (1) and 5.6mL of AlEt with a concentration of 1mmol / mL 3 Add the hexane solution, react at 20-30°C for 1 hour, heat to evaporate the alkane solvent, and obtain fluid activated silica.

[0058] (3) In another reaction flask with a stirrer, add 0.64mL TiCl 4 , 2,6-bis[1-(2,6-dimethylbenimine)ethyl]pyridine ferric ...

Example Embodiment

[0063] Example 3

[0064] Preparation of catalyst composition

[0065] (1) Weigh about 20g of spherical silica gel (produced by Grace Company in the United States, with an average particle size of 55μm and a specific surface area of ​​278m 2 / g), put silicon dioxide in a gas-phase fluidized bed activator, blow and fluidize it with anhydrous and oxygen-free nitrogen, gradually raise the temperature to 600°C, and dehydrate at constant temperature for 10 hours to obtain dehydrated silicon dioxide.

[0066] (2) Add 100mL of isopentane to a reaction flask with a stirrer under nitrogen protection, add 10g of silica gel after thermal activation treatment in step (1) and 5.6mL of AlEt with a concentration of 1mmol / mL 3 Add the hexane solution, react at 20-30°C for 1 hour, heat to evaporate the alkane solvent, and obtain fluid activated silica.

[0067] (3) In another reaction flask with a stirrer, add 1.74g MgCl 2 , 2,6-bis[1-(2,6-dimethylbenimine)ethyl]pyridine ferric dichloride 0.3...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a catalyst composition for ethylene gas-phase polymerization or co-polymerization, preparation and applications thereof. The preparation method comprises the following steps: dissolving a titanium compound, an iron compound, and a magnesium compound in tetrahydrofuran so as to obtain a mother liquid; adding a modified silica carrier, which has been subjected to a thermal treatment and a chemical treatment, into the mother liquid, carrying out refluxing for 1 hour under stirring, blow-drying the mother liquid with high-purity nitrogen gas to remove the excess tetrahydrofuran, controlling the residual tetrahydrofuran content to be in a range of 10 to 15 wt% of the total weight of the product, floating the obtain solid in a low-carbon alkane solvent, carrying out a reduction treatment for 30 minutes on the solid at a room temperature by using one or more alkyl aluminum compounds, and then blow-drying the product with high-purity nitrogen gas so as to obtain the catalyst composition. The catalyst has a high catalytic activity when the catalyst is used to catalyze ethylene polymerization especially the gas-phase fluidized bed polymerization; and can prepare polyethylene products with a wide molecular weight distribution or double-peak distribution. The prepared polyethylene product has a high bulk density and little fine powder.

Description

technical field [0001] The invention relates to a catalyst suitable for producing bimodal or broad-modal distribution polyethylene in a single reactor and a preparation method thereof, in particular to a bimetallic silica gel carrier catalyst composition suitable for ethylene polymerization or copolymerization and its preparation method. Background technique [0002] Polyethylene resin is one of the four major synthetic resins. High-performance polyethylene resin must have high toughness, high strength and high environmental stress cracking resistance. Increasing the molecular weight of polyethylene can lead to a corresponding improvement in these properties. However, as the molecular weight of the polymer increases, the processability of the resin generally decreases. By preparing polymers with a broad or bimodal molecular weight distribution, not only can the characteristic properties of high molecular weight resins be maintained, but the processability of the resins can...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F10/02C08F2/34C08F4/02C08F4/70
CPCY02P20/52
Inventor 何书艳姜涛邹恩广杨家靖赵成才付义王斯晗苏杭张瑀健王兆武姜进宪高宇新李明权马丽王立娟赵增辉任鹤任合刚王世华杨立伟李洪兴李文邴淑秋汪涵于秀娟
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap