Solid Titanium Catalyst Component for Ethylene Polymerization
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Solution Overview
Problem
Current ethylene polymerization methods face challenges in achieving high activity, controlling molecular weight, reducing solvent-soluble components, and maintaining good particle properties, particularly in producing ethylene polymers with narrow particle size distribution and low rust formation on molding dies.
Innovation Solution
A solid titanium catalyst component is developed by contacting a liquid magnesium compound with a liquid titanium compound in the presence of specific electron donors, optimizing the molar ratios and types of electron donors to enhance polymerization activity, molecular weight control, and reduce solvent-soluble components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solid titanium catalyst component is used to achieve high polymerization activity, then productivity is improved, but solvent-soluble components increase and particle properties deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst component by specifying precise molar ratios of titanium compound (0.8-2.0 mmol), magnesium compound (1.0-3.0 mmol), and electron donor (1.0-3.0 mmol). This parameter optimization resolves the contradiction by achieving high activity while controlling solvent-soluble components and improving particle properties through controlled composition rather than arbitrary ratios.
Solution Approach 2:
The invention creates a composite catalyst component combining titanium compound, magnesium compound, and electron donor in specific proportions. This composite structure allows the system to achieve high polymerization activity while the synergistic interaction between components controls solvent-soluble components and improves particle properties, resolving the contradiction between productivity and manufacturing precision.
2Manufacturing precision
If hydrogen is added to control molecular weight, then molecular weight control is improved, but polymerization activity is reduced
Solution Approach 1:
The invention introduces an electron donor as an intermediary substance that mediates between the titanium-magnesium catalyst system and hydrogen. The electron donor enables effective molecular weight control through hydrogen interaction while preserving high polymerization activity, resolving the contradiction by providing a mediating role that allows both functions to coexist.
3Manufacturing precision
If multistage polymerization is used to broaden molecular weight distribution, then film quality is improved, but solvent-soluble components increase
Solution Approach 1:
The invention optimizes the catalyst composition parameters to enable multistage polymerization with controlled solvent-soluble components. By precisely controlling the molar ratios of titanium, magnesium, and electron donor, the system achieves broad molecular weight distribution for improved film quality while minimizing solvent-soluble components through the specific compositional framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables high-activity ethylene polymerization with reduced solvent-soluble components, excellent particle properties, and improved molecular weight control, leading to enhanced productivity and environmental benefits.
Implementation Method 1
a solid titanium catalyst component (I) for ethylene polymerization which is obtained by bringing a liquid magnesium compound (A) comprising a magnesium compound, an electron donor (a) having 1 to 5 carbon atoms and an electron donor (b) having 6 to 30 carbon atoms into contact with a liquid titanium compound (C) under the presence of an electron donor (B)
Data Source
AI summary
Provided are a solid titanium catalyst component for ethylene polymerization which can polymerize ethylene at a high activity and which can provide an ethylene polymer having an excellent particle property, an ethylene polymerization catalyst and an ethylene polymerization method in which the catalyst is used.The solid titanium catalyst component (I) for ethylene polymerization according to the present invention is obtained by bringing a liquid magnesium compound (A) including a magnesium compound, an electron donor (a) having 1 to 5 carbon atoms and an electron donor (b) having 6 to 30 carbon atoms into contact with a liquid titanium compound (C) under the presence of an electron donor (B) and includes titanium, magnesium and a halogen. The ethylene polymerization catalyst of the present invention includes the component (I) and an organic metal compound catalyst component (II). Further, the ethylene polymerization method of the present invention is a method for polymerizing ethylene under the presence of the catalyst.