Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Supported chromium and metallocene bimetallic catalyst, preparation method and applications thereof

A bimetallic catalyst, supported technology, applied in the production of bulk chemicals, etc., can solve the problems of unsatisfactory reduction effect of chromium active center and reduced activity

Active Publication Date: 2020-03-13
CHINA PETROLEUM & CHEM CORP +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of catalyst is activated by a single aluminoxane activator, while the chromium-based catalyst usually uses an alkylaluminum activator, which will inevitably lead to an unsatisfactory reduction effect of the chromium active center, resulting in a decrease in activity

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
  • Supported chromium and metallocene bimetallic catalyst, preparation method and applications thereof
  • Supported chromium and metallocene bimetallic catalyst, preparation method and applications thereof
  • Supported chromium and metallocene bimetallic catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0065] The preparation method of described loaded type chromium and alocene bimetallic catalyst is as follows:

[0066] Preparation of titanium-loaded silica gel: select commercially available Davison955 silica gel as an inorganic carrier, immerse in n-hexane solution of tetra-n-butyl titanate (titanium loading is 2wt%), stir continuously for 4 hours, then dry in an oil bath at 80°C for 4 hours, Then use vacuum drying for 2 hours to further remove the solvent in the pores of the silica gel carrier, transfer to a blast drying oven for 8 hours at 80°C and dry for 8 hours; then, roast and activate the dried samples in a fluidized bed, maintain the low temperature section at 120°C for 2 hours, and The temperature was kept at 600°C for 4 hours under pure air, and the silica gel was finally cooled naturally under nitrogen to obtain titanium dioxide modified silica gel prepared by the impregnation method.

[0067] Dissolve 0.11g of chromium acetate in 36ml of distilled water at 60°C ...

Embodiment 1-2

[0071] The catalyst of Example 1-1 was used to carry out the hydrogen modulation polymerization test according to the gas phase polymerization mode, except that 0.002 MPa hydrogen gas was added during the polymerization.

Embodiment 1-3

[0073] This embodiment is the same as Embodiment 1-2, except that the amount of hydrogen added is 0.004MPa.

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 polyethylene catalyst, particularly to a supported chromium and metallocene bimetallic catalyst, a preparation method and applications thereof. The supported chromium and metallocene bimetallic catalyst comprises an inorganic carrier and two supported active components, wherein the inorganic carrier is an inorganic oxide, and the two active components comprise a chromiumoxide and a metallocene composition. According to the invention, the metallocene active center and the chromium metal active center are loaded on the same titanium-modified carrier, so that the catalyst has excellent hydrogen regulation responsiveness and excellent copolymerization performance, and can conveniently regulate the flow rate and the density of the melt, the produced high-density polyethylene has the characteristics of wide molecular weight distribution and bimodal polyethylene, and the catalyst has high activity and is a high-performance supported chromium and metallocene bimetallic catalyst. The invention further provides a preparation method and applications of the supported chromium and metallocene bimetallic catalyst, wherein the method is scientific, reasonable, simple and easy to implement, and is used for synthesizing ethylene homopolymers and ethylene and alpha-olefin copolymers.

Description

technical field [0001] The invention relates to a polyethylene catalyst, in particular to a supported chromium and bimetallocene catalyst, a preparation method and application thereof. Background technique [0002] Polyethylene (PE) resin is a kind of thermoplastic polymerized by ethylene monomer. It is one of the general-purpose plastic products with the largest output and consumption in the world today. It mainly includes low-density polyethylene (LDPE), linear low-density polyethylene Ethylene (LLDPE), high-density polyethylene (HDPE) and some polyethylenes with special properties. Polyethylene has excellent mechanical properties, electrical insulation, chemical corrosion resistance, low temperature resistance and excellent processability. Polyethylene products are widely used in various fields such as industry, agriculture, automobile, communication and daily life. [0003] Currently known polyethylene catalysts mainly include Ziegler-Natta catalysts, chromium-based ca...

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): C08F110/02C08F210/16C08F4/02C08F4/6592C08F4/622
CPCC08F110/02C08F210/16C08F4/025C08F4/65922C08F4/6222C08F210/14Y02P20/52
Inventor 范大鹏严婕徐晓周建勇李功韬李晓庆鲍春伟朱卫东
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com