Increasing HHP Particle Size via Solvent Adduct Decomposition
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Solution Overview
Problem
The small particle size of 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine (HHP) poses challenges such as airborne dust hazards, risk of dust explosions, and erratic reaction behavior during polymerization due to 'slug flow' issues, necessitating a method to increase the mean particle size to greater than 5 microns.
Innovation Solution
A method involving the formation of a mixture of HHP with a solvent composition comprising an organic solvent and water, followed by heating to decompose the adduct, effectively increasing the mean particle size of HHP to greater than 5 microns, while also enhancing its tap density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If HHP is isolated as a fine powder, then the production process is simple, but the mean particle size is less than 2 microns causing dust hazards and slug flow issues
Solution Approach 1:
The patent changes the physical parameter of particle size by dissolving HHP in a solvent to form an adduct, then decomposing the adduct through heating. This transforms the fine powder ( < 2 microns) into larger particles (> 5 microns), eliminating dust hazards and slug flow issues while maintaining production feasibility
Solution Approach 2:
The patent introduces a solvent as an intermediary substance to form an adduct with HHP. This intermediary step allows the HHP to be processed in a dissolved state, enabling particle size enlargement upon decomposition without directly manipulating the fine powder, thus avoiding dust hazards during processing
2Object-affected harmful factors
If the mean particle size of HHP is increased to greater than 5 microns, then dust hazards and slug flow issues are reduced, but additional processing steps are required
Solution Approach 1:
The patent utilizes phase transitions of the solvent (dissolution and evaporation/decomposition) to achieve particle size enlargement. The HHP dissolves in the solvent to form an adduct, then upon heating the solvent decomposes and evaporates, leaving behind enlarged HHP particles. This phase transition approach achieves particle size control through relatively simple thermal processing
3Object-affected harmful factors
If HHP particles are enlarged to reduce airborne dust, then safety is improved, but the tap density may decrease affecting flow characteristics
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the solvent type, adduct formation conditions, and decomposition temperature are adjusted to achieve both particle size enlargement (> 5 microns for dust reduction) and adequate tap density maintenance, balancing safety and flow characteristics
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 method successfully increases the mean particle size of HHP, improving handling safety and reaction control by reducing dust hazards and 'slug flow' issues, and enhancing the tap density for better flow characteristics.
Implementation Method 1
a solvent composition comprising an organic solvent and water, wherein the organic solvent is capable of at least partially dissolving the 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine
Implementation Method 2
the mixture is heated at a temperature and for a time effective to decompose the adduct to form a 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine product having a mean particle size greater than 5 microns
Data Source
AI summary
A method for increasing a mean particle size of a 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine is provided. The method comprises forming a mixture comprising a feedstream of the 2-hydrocarbyl-3,3-bis(4-hydroxyaryl)phthalimidine, and a solvent composition comprising an organic solvent and water, wherein the organic solvent is capable of at least partially dissolving the 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine and forming an adduct with the 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine. Then the mixture is heated at a temperature and for a time effective to decompose the adduct and form a 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidine product having a mean particle size greater than 5 microns. The 2-hydrocarbyl-3,3-bis(hydroxyaryl)phthalimidines with increased particle size are useful for producing polymers.