Spray Drying Supported Catalyst Compositions for Olefin Polymerization
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Solution Overview
Problem
Conventional methods for preparing supported transition metal catalysts, such as metallocene catalysts, are economically inefficient due to lengthy vacuum drying processes, especially for large-scale production, which affects productivity and catalyst performance.
Innovation Solution
A spray drying process is employed to rapidly dry supported catalyst compositions, forming a suspension with porous particulate supports, activator compounds, and catalyst compounds in liquid diluents, allowing for the production of at least 200 kg of catalyst in under 5 hours with reduced residual liquid content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum drying is used to remove liquid diluent from supported catalyst, then the catalyst can be obtained in free-flowing powder form, but the drying time becomes extremely long (15 hours or more) especially for large batch sizes
Solution Approach 1:
The patent changes the physical parameters of the drying process by using spray drying technology instead of conventional vacuum drying. This involves atomizing the catalyst suspension into fine droplets and rapidly evaporating the solvent, achieving complete drying in 30 minutes to 2 hours compared to 15+ hours of vacuum drying, while maintaining catalyst activity and product quality
Solution Approach 2:
The patent utilizes phase transition of the liquid diluent from liquid to vapor state through rapid evaporation during spray drying. The liquid suspension is converted into aerosol droplets that quickly evaporate, transforming the liquid diluent into vapor and leaving dry catalyst particles, thereby dramatically reducing drying time while achieving the required dryness
2Productivity
If supported catalyst is prepared in large batch sizes (200 kg or more), then production scale increases, but vacuum drying becomes even more time-consuming and economically inefficient
Solution Approach 1:
The spray drying process parameters (atomization rate, drying temperature, air flow) are optimized to handle large batch sizes efficiently. The continuous spray drying operation can process large volumes of suspension without proportionally increasing drying time, maintaining economic efficiency at scale
Solution Approach 2:
The patent implements continuous spray drying operation where the suspension is continuously fed, atomized, and dried, rather than batch processing. This continuous operation maintains constant productivity and eliminates idle time between batches, making large-scale production economically viable
3Ease of manufacture
If conventional vacuum drying is used, then catalyst can be produced, but the long drying time negatively impacts the economics of catalyst production
Solution Approach 1:
The patent changes the manufacturing process parameters by replacing vacuum drying with spray drying, which operates at atmospheric pressure with controlled temperature and air flow. This parameter change reduces drying time from 15+ hours to under 2 hours while maintaining catalyst quality and ease of manufacture
Solution Approach 2:
The patent replaces the mechanical vacuum drying system with a spray drying system that uses aerosolization and thermal evaporation. This substitution eliminates the need for long-duration vacuum pumping and mechanical drying, achieving the same manufacturing result in a fraction of the time
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 significantly reduces drying time, maintains catalyst activity, and achieves equivalent or higher productivity in olefin polymerization compared to conventional vacuum drying methods, while minimizing economic losses.
Implementation Method 1
spray drying the suspension to form a supported catalyst composition
Data Source
AI summary
Methods of preparing supported catalyst compositions using spray drying are disclosed. The supported catalyst compositions find use in the polymerization of olefins.