Low Residual Bisphenol A Alkoxylated Materials via Segmented Reaction
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Solution Overview
Problem
Existing methods for producing alkoxylated Bisphenol A compositions result in high residual Bisphenol A content, which is undesirable for applications like food contact packaging, where low Bisphenol A levels are required.
Innovation Solution
A modified manufacturing process involving sequential reactions of Bisphenol A with alkylene oxide in the presence of an alkaline catalyst at elevated temperature and pressure, including a rest period, to achieve alkoxylated Bisphenol A compositions with residual Bisphenol A levels below 100 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single-stage alkoxylation process is used, then production efficiency is maintained, but residual Bisphenol A content remains high
Solution Approach 1:
The alkoxylation process is divided into two sequential stages: first stage alkoxylation followed by a rest period, then second stage alkoxylation. This segmentation allows the reaction to proceed more completely, reducing residual Bisphenol A content to below 100 ppm while maintaining production efficiency through optimized process timing.
Solution Approach 2:
The rest period between the two alkoxylation stages serves as a preliminary action that allows the reaction mixture to equilibrate and facilitates further reaction. This intermediate pause enables more complete conversion of Bisphenol A, achieving low residual content without significantly extending total process time.
2Manufacturing precision
If reaction time is extended to reduce residual Bisphenol A, then purity improves, but production time increases
Solution Approach 1:
The process uses periodic action by implementing two distinct alkoxylation stages separated by a rest period. This periodic approach allows the reaction to proceed in controlled intervals, achieving complete conversion and low residual Bisphenol A content while optimizing total production time through efficient use of reaction and rest periods.
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
Consistently reduces residual Bisphenol A content to less than 100 ppm, making the materials suitable for direct and indirect food contact packaging, printing inks, and container linings by optimizing the reaction conditions and incorporating a rest period in the process.
Implementation Method 1
reacting Bisphenol A with a first amount of alkylene oxide in the presence of at least one alkaline catalyst at elevated temperature and pressure
Implementation Method 2
reacting Bisphenol A with a first amount of alkylene oxide in the presence of at least one alkaline catalyst at elevated temperature and pressure
Implementation Method 3
allowing the mixture to cool and form an alkoxylated Bisphenol A composition
Data Source
AI summary
This invention relates to alkoxylated Bisphenol A compositions containing low residual amounts of Bisphenol A. The present invention also relates to methods for making such alkoxylated compositions containing low residual amounts of Bisphenol A, as well as uses for such compositions. The alkoxylated compositions containing low residual amounts of Bisphenol A may be utilized in packaging applications (such as indirect and/or direct food contact packaging), printing inks, container linings, and the like.