Steam Stripping of Core-Shell Extender Particles
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Solution Overview
Problem
Steam stripping of opaque polymer dispersions is inefficient in removing volatile organic compounds (VOCs), particularly aromatic VOCs like benzene isomers and benzaldehyde, which are harmful to the environment and indoor air quality.
Innovation Solution
A process involving mixing core-shell organic extender particles with a binder comprising an acrylic emulsion polymer before steam stripping, optimizing the dry weight ratio of binder to particles from 5:95 to 95:5, to enhance VOC removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional steam stripping is used on opaque polymer dispersions, then the process is simple and straightforward, but VOC removal efficiency is poor
Solution Approach 1:
The patent applies preliminary action by mixing the opaque polymer dispersion with a binder (such as white spirit, turpentine, or other organic solvents) before performing steam stripping. This pre-mixing step modifies the dispersion composition to enhance VOC release during subsequent steam stripping, thereby improving removal efficiency without significantly complicating the overall process
Solution Approach 2:
The binder serves as an intermediary substance that facilitates more effective VOC removal. By introducing this intermediate component, the steam stripping process can more efficiently extract aromatic VOCs from the polymer dispersion, acting as a mediator between the steam and the target VOCs
2Productivity
If steam stripping is applied to remove VOCs from polymer dispersions, then energy consumption is moderate, but aromatic VOCs like benzene isomers and benzaldehyde are not effectively removed
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the dispersion through binder addition. This changes the volatility and steam stripping characteristics of the system, enabling more effective removal of high-boiling aromatic VOCs like benzaldehyde and benzene isomers while maintaining reasonable energy consumption
3Object-generated harmful factors
If opaque polymer dispersions are produced with TiO2 replacement, then cost is reduced and environmental impact is lowered, but residual monomers and impurities contribute to VOC content
Solution Approach 1:
The patent applies the extraction principle by using steam stripping to remove harmful VOC components (residual monomers, impurities from monomers, reaction by-products, and solvents from surfactants) from the opaque polymer dispersion. This selectively extracts harmful substances while preserving the opacity-providing core-shell particles
Solution Approach 2:
The steam stripping process utilizes thermal oxidation mechanisms to break down and remove volatile organic compounds. The high-temperature steam environment promotes oxidation of VOCs, converting them to water-soluble or gaseous products that can be easily separated from the polymer dispersion
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 effectively reduces aromatic VOCs by at least 10-40% compared to traditional steam stripping methods, improving air quality and reducing environmental impact.
Implementation Method 1
steam stripping is one of widely used approaches in removing VOCs from polymer dispersions
Implementation Method 2
removing VOCs from polymer dispersions by contacting the dispersion with steam
Data Source
AI summary
A process of stripping a dispersion of organic extender particles with volatile organic compounds and a method of reducing volatile organic compounds.