Carbon Black Purification Using Supercritical CO2 Extraction
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Solution Overview
Problem
Existing carbon black production processes result in the contamination of carbon blacks with polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (oxy-PAHs), which are harmful to health and environment, necessitating a process to effectively remove these impurities without adversely affecting the carbon black's properties or using harmful substances.
Innovation Solution
A process utilizing supercritical carbon dioxide extraction to remove oxy-PAHs and PAHs from carbon blacks, leveraging its unique physical properties for efficient and economical purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional carbon black production processes are used, then carbon black is produced efficiently, but oxy-PAH and PAH impurities contaminate the carbon black
Solution Approach 1:
The patent applies extraction principle by using supercritical carbon dioxide to extract and remove oxy-PAH and PAH impurities from carbon black. The supercritical fluid penetrates the carbon black structure and selectively dissolves the harmful impurities, which are then separated by depressurization, achieving effective purification while maintaining production efficiency
Solution Approach 2:
The patent utilizes parameter changes by transforming carbon dioxide into a supercritical state through controlled temperature and pressure adjustments. This phase change enables the solvent to achieve optimal density and solubility characteristics for selective impurity removal, then reverses the process for easy solvent recovery and impurity separation
2Reliability
If oxidation treatment is applied to carbon black, then functional groups are introduced to improve performance, but oxy-PAH impurities form as byproducts
Solution Approach 1:
The patent converts the harmful oxy-PAH byproducts generated during oxidation treatment into removable impurities. By applying supercritical fluid extraction after oxidation, the process transforms the unwanted contamination into a separable component, allowing the beneficial functional groups to remain while removing the harmful byproducts
3Manufacturing precision
If traditional purification methods are used, then some impurities are removed, but the process uses harmful substances or complex procedures
Solution Approach 1:
The patent uses supercritical carbon dioxide as an intermediary solvent that mediates between the carbon black and the purification process. This intermediary substance provides selective solubility for impurity removal while being environmentally benign, replacing traditional harmful chemical agents and enabling clean purification
4Manufacturing precision
If supercritical carbon dioxide extraction is applied, then oxy-PAH and PAH content is significantly reduced, but additional process steps are required
Solution Approach 1:
The patent merges the purification function with the existing carbon black production process by integrating supercritical fluid extraction as a post-treatment step. This combination approach achieves significant impurity reduction while utilizing the same equipment infrastructure, minimizing additional process complexity
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 process achieves a significant reduction in oxy-PAH and PAH content in carbon blacks, maintaining the carbon black's properties and avoiding the use of harmful substances, with high mass transfer rates and easy solvent separation.
Implementation Method 1
treating the carbon black with an extraction agent comprising carbon dioxide in a supercritical state to extract at least a portion of the oxy-polycyclic aromatic hydrocarbons from the carbon black
Data Source
AI summary
It is provided a process for producing a purified carbon black with a reduced content of oxy-polycyclic aromatic hydrocarbons, the process including: (a) providing a carbon black including an initial content of oxy-polycyclic aromatic hydrocarbons of 1 ppm or more, (b) treating the carbon black including an initial content of oxy-polycyclic aromatic hydrocarbons with an extraction agent including carbon dioxide in a supercritical state to extract at least a portion of the oxy-polycyclic aromatic hydrocarbons from the carbon black, and (c) removing the extraction agent including the extracted oxy-polycyclic aromatic hydrocarbons from the carbon black to obtain a purified carbon black with a lower content of oxy-polycyclic aromatic hydrocarbons than the initial content of oxy-polycyclic aromatic hydrocarbons. It is furthermore provided a carbon black obtained through said production process and articles made therefrom.