Chromium-Silica-Titanium Catalyst Preparation Using Aqueous Solvation
Solution Overview
Problem
The production of olefin polymerization catalysts, particularly chromium-silica-titanium catalysts, is hindered by the time and cost associated with rigorous drying processes, necessitating the development of more efficient methods for depositing titanium onto silica-based catalyst supports.
Innovation Solution
A method involving the formation of a titanium-containing solution with a solvating agent and solvent, followed by contact with a chrominated silica-support or silica-support, and subsequent thermal treatment between 400°C to 1000°C for 1 minute to 24 hours to create the catalyst, which can include various sequences of component contact and solvating agents like ascorbic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigorous drying processes are used to prepare water-sensitive catalyst components, then catalyst activity and purity are improved, but production time and cost increase
Solution Approach 1:
The patent converts the harmful effect of water (which typically deactivates catalyst components) into a beneficial feature by developing an aqueous solution process. Water is used as the solvent to deposit titanium onto the silica support, eliminating the need for rigorous drying while maintaining catalyst activity. The aqueous environment is leveraged to achieve effective titanation without requiring the catalyst components to be completely dry.
Solution Approach 2:
The patent changes the physical-chemical parameters of the preparation process by using aqueous solutions instead of organic solvents and eliminating high-temperature drying steps. The deposition is performed from water-based solutions at moderate temperatures, fundamentally altering the process parameters from anhydrous/high-temperature conditions to aqueous/moderate-temperature conditions.
2Reliability
If rigorous drying processes are used to prepare water-sensitive catalyst components, then catalyst activity and purity are improved, but production cost increases
Solution Approach 1:
The patent converts the harmful effect of water (which typically deactivates catalyst components) into a beneficial feature by developing an aqueous solution process. Water is used as the solvent to deposit titanium onto the silica support, eliminating the need for rigorous drying while maintaining catalyst activity. The aqueous environment is leveraged to achieve effective titanation without requiring the catalyst components to be completely dry.
Solution Approach 2:
The patent changes the physical-chemical parameters of the preparation process by using aqueous solutions instead of organic solvents and eliminating high-temperature drying steps. The deposition is performed from water-based solutions at moderate temperatures, fundamentally altering the process parameters from anhydrous/high-temperature conditions to aqueous/moderate-temperature conditions.
3Stability of the object's composition
If conventional titanium deposition methods are used on silica-based catalyst supports, then catalyst structure is maintained, but deposition efficiency and productivity are low
Solution Approach 1:
The patent converts the harmful effect of water (which typically deactivates catalyst components) into a beneficial feature by developing an aqueous solution process. Water is used as the solvent to deposit titanium onto the silica support, eliminating the need for rigorous drying while maintaining catalyst activity. The aqueous environment is leveraged to achieve effective titanation without requiring the catalyst components to be completely dry.
Solution Approach 2:
The patent changes the physical-chemical parameters of the preparation process by using aqueous solutions instead of organic solvents and eliminating high-temperature drying steps. The deposition is performed from water-based solutions at moderate temperatures, fundamentally altering the process parameters from anhydrous/high-temperature conditions to aqueous/moderate-temperature conditions.
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
This method reduces production costs and time by effectively forming active olefin polymerization catalysts with improved titanation, as demonstrated by increased high load melt index values in polymerization experiments.
Implementation Method 1
contacting a titanium-containing compound, a solvating agent, and a solvent to form a solution
Implementation Method 2
thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst
Data Source
AI summary
A method of preparing a catalyst comprising a) contacting a titanium-containing compound, a solvating agent, and a solvent to form a solution; b) contacting the solution with a chrominated silica-support to form a pre-catalyst; and c) thermally treating the pre-catalyst by heating to a temperature of from about 400° C. to about 1000° C. for a time period of from about 1 minute to about 24 hours to form the catalyst.