PVC Solvent Screening via Swelling Score Equation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for recycling polyvinyl chloride (PVC) are inefficient and often harmful, as they do not effectively minimize damage to humans and the environment, and there is a need for a method to screen solvents that can extract PVC from waste while considering the solubility and precipitation processes.
Innovation Solution
A method using the PVC swelling score equation (PVC swelling score = x1*Dipole + x2*Asphericity + x3*dH + x4*Polar Surface Area) to screen solvents for extracting PVC, where x1, x2, x3, and x4 are real numbers from 0 to 5, and the solvents are classified based on their dipole moment, asphericity, Hansen solubility parameter, and polar surface area to determine their suitability as good or non-solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional recycling methods are used for PVC waste, then the recycling process can be performed, but the methods are inefficient and harmful to humans and the environment
Solution Approach 1:
The patent applies parameter changes by using a specific solvent system (chlorinated hydrocarbon solvent) with controlled composition ratios and extraction parameters to improve PVC recycling efficiency while reducing harmful effects. The method optimizes solvent properties and extraction conditions to achieve effective PVC recovery without the harmful byproducts of conventional methods
Solution Approach 2:
The patent uses a chlorinated hydrocarbon solvent as an intermediary substance to facilitate the separation and extraction of PVC from waste materials. This intermediary enables efficient PVC recovery while being environmentally safer than conventional recycling approaches, acting as a mediator between the waste material and the recycling process
2Measurement precision
If a solvent screening method based on multiple parameters (dipole moment, asphericity, Hansen solubility parameter, polar surface area) is used, then the accuracy of predicting solvent suitability for PVC extraction is improved, but the complexity of the screening process increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the four key parameters (dipole moment, asphericity, Hansen solubility parameter, polar surface area) for various solvents before the actual screening process. This preliminary preparation allows for rapid and accurate solvent suitability assessment using Equation 1, reducing the complexity of the actual screening operation while maintaining high prediction accuracy
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 allows for the identification of suitable solvents and solvent combinations for extracting and recycling PVC, improving the efficiency and environmental safety of the recycling process by accurately predicting solubility and precipitation behavior.
Implementation Method 1
screening a solvent for extracting polyvinyl chloride from waste including the polyvinyl chloride
Implementation Method 2
the solvents are classified based on their dipole moment, asphericity, Hansen solubility parameter, and polar surface area to determine their suitability as good or non-solvents
Data Source
AI summary
A method for screening a solvent for extracting polyvinyl chloride (PVC) from waste using the following Equation 1:PVC swelling score=x1 Dipole+x2 Asphericity+x3dH+x4 Polar Surface Areawhere x1, x2, x3, and x4 are each a real number from 0 to 5, Dipole is a dipole moment of solvent molecules, Asphericity is an asphericity of the solvent molecules, dH is a Hansen solubility parameter for a hydrogen bonding of the solvent molecules, and Polar Surface Area is a fractional polar surface area. A method for recycling waste is also provided. Additionally, a recycled polyvinyl chloride and a recycled composition are provided.