Cationic Saccharide Synthesis via Oxa-Michael Addition
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Solution Overview
Problem
Current methods for producing cationic saccharides are limited by the need for epoxide chemistry and result in non-biodegradable polymers with short shelf-life and high dosages, while biopolymers used as alternatives have shorter shelf-life and require higher dosages, necessitating the development of environmentally-friendly and efficient production methods.
Innovation Solution
A method involving oxa-Michael addition reaction between saccharides and compounds with conjugated electron withdrawing groups in the presence of a base to produce derivatized saccharides, which are then cationized, allowing for the synthesis of biobased and biodegradable cationic saccharides suitable for various industrial applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxide chemistry is used to produce cationic saccharides, then cationic polymers can be synthesized, but the polymers become non-biodegradable and have short shelf-life
Solution Approach 1:
The patent changes the chemical reaction parameters by using oxa-Michael addition reaction instead of epoxide chemistry, and by modifying the cationization process to use quaternary ammonium salts with specific structures (formula I-X). This parameter change enables biodegradability while maintaining shelf-life through controlled cationic charge introduction.
Solution Approach 2:
The patent replaces the traditional epoxide-based chemical mechanism with an oxa-Michael addition reaction mechanism. This substitution eliminates the formation of non-biodegradable polymers while still achieving cationic saccharide production, thereby resolving the contradiction between shelf-life and biodegradability.
2Object-generated harmful factors
If biopolymers are used as alternatives to synthetic polymers, then environmental friendliness is improved, but shelf-life becomes shorter and dosage requirements increase
Solution Approach 1:
The patent creates composite structures by combining biodegradable saccharide polymers with cationic moieties through controlled oxa-Michael addition. This composite approach maintains the environmental benefits of biopolymers while introducing properties (through the cationic modification) that improve shelf-life and reduce dosage requirements.
Solution Approach 2:
The patent modifies the chemical parameters of biopolymers by introducing cationic charges through the oxa-Michael addition reaction with quaternary ammonium salts. This parameter change enables the biopolymers to achieve longer shelf-life and lower dosage requirements while maintaining their environmental friendliness.
3Ease of manufacture
If conventional cationization methods are used on derivatized saccharides, then cationic saccharides can be produced, but the process complexity increases
Solution Approach 1:
The patent merges the derivatization and cationization steps into a single integrated process. The oxa-Michael addition reaction simultaneously achieves both the derivatization of the saccharide and the introduction of the cationic moiety, eliminating the need for separate cationization steps and thereby simplifying the overall manufacturing process.
Solution Approach 2:
The patent performs the cationic modification during the initial derivatization step rather than as a subsequent separate process. By incorporating the cationic moiety introduction into the oxa-Michael addition reaction itself, the patent eliminates later process steps and simplifies the overall production workflow.
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 enables the production of cationic saccharides under mild conditions, providing biodegradable polymers that can be used as effective flocculants in wastewater treatment and strength agents in papermaking, with improved performance due to the smaller molar mass of the cationic moiety bound via the ether bond.
Implementation Method 1
reacting a saccharide with a compound having a conjugated electron withdrawing group via oxa-Michael addition reaction in presence of a base or mixture of bases for producing a derivatized saccharide
Implementation Method 2
cationizing the derivatized saccharide
Data Source
AI summary
The present invention relates to a method for producing cationic saccharides by reacting saccharide with a compound having a conjugated electron withdrawing group via oxa-Michael addition reaction for producing a derivatized saccharide followed by cationizing the derivatized saccharide. The present invention further relates to use of the cationic saccharides as flocculants and as strength agents.