Boron-Containing Silica Support for Olefin Polymerization Catalyst
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Solution Overview
Problem
Existing catalysts for olefin polymerization, such as those using silica-carrier catalysts treated with butyl ethyl magnesium or triethylaluminium, result in broad size distribution and high dust production, leading to increased production costs and low catalyst activity.
Innovation Solution
A boron-containing silica support is prepared through heat treatment and chemical treatment with boron halides, specifically boron trichloride, to create a high activity olefin polymerization catalyst with a narrow size distribution and reduced dust formation, comprising boron, titanium, magnesium, and chloride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silica-carrier catalyst is treated with butyl ethyl magnesium or triethylaluminium, then catalyst preparation is simplified, but size distribution becomes broad and dust production increases
Solution Approach 1:
The patent changes the chemical treatment parameters by using boron halide (BX3) instead of conventional organometallic compounds, and controls the treatment conditions (temperature, time, concentration) to achieve narrow size distribution while maintaining ease of manufacture
Solution Approach 2:
The patent creates a composite silica-boron catalyst system where boron is incorporated into the silica structure through chemical treatment, forming a new composite material that provides both ease of manufacture and precise size control
2Ease of manufacture
If silica-carrier catalyst is treated with butyl ethyl magnesium or triethylaluminium, then catalyst preparation is simplified, but dust production increases
Solution Approach 1:
The patent changes the chemical treatment parameters by using boron halide (BX3) instead of conventional organometallic compounds, and controls the treatment conditions (temperature, time, concentration) to minimize dust formation while maintaining ease of manufacture
Solution Approach 2:
The patent converts the potential harmful effect of chemical treatment into a beneficial outcome by using boron halide treatment that not only simplifies preparation but also reduces dust production, turning a potentially harmful process into a beneficial one
3Device complexity
If conventional silica support is used, then catalyst structure is simple, but catalyst activity is low
Solution Approach 1:
The patent creates a composite silica-boron catalyst system where boron is incorporated into the silica structure through chemical treatment, forming a new composite material that provides both structural simplicity and high catalytic activity
Solution Approach 2:
The patent changes the chemical composition parameters by introducing boron into the silica structure through controlled chemical treatment, thereby enhancing catalyst activity while maintaining structural simplicity
4Quantity of substance
If broad size distribution catalyst is used, then production costs are low, but polymer quality is poor
Solution Approach 1:
The patent changes the catalyst preparation parameters using boron halide treatment to achieve narrow size distribution, which improves polymer quality while the process remains cost-effective due to its simplicity
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 boron-containing silica support catalyst achieves high activity and narrow size distribution, reducing dust occurrence and production costs while maintaining high polymerization efficiency.
Implementation Method 1
treating the silica with heat under inert atmosphere
Implementation Method 2
chemically treating the silica obtained from (a) using boron compound to achieve the boron-containing silica support
Data Source
AI summary
The present invention relates to a high activity olefin polymerization catalyst comprising a boron-containing silica support and the preparation thereof. This invention is characterized in that the support is heat treated in combination with a chemical treatment using a boron compound. The boron compound used in the chemical treatment of this invention is boron halide, preferably boron trichloride. The catalyst of this invention has the weight of boron comparing with the support is 0.5 to 0.7% and has the weight of the boron relative to the catalyst of 0.1 to 0.5%. The catalyst of this invention has chemical compositions comprising:—Boron 0.1-0.5% wt;—Titanium 4-6% wt;—Magnesium 2-6% wt;—Chloride 15-25% wt.