Thin Film Polymerization of Hydroxy-Carboxylic Acids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lignocellulosic biomass is recalcitrant to enzyme attack due to its compact matrix structure, leading to low yields in hydrolysis and processing, and existing methods for producing polymers like polylactic acid involve indirect synthesis with intermediate isolation steps.
Innovation Solution
A method involving the conversion of lignocellulosic biomass into hydroxy-carboxylic acids, which are then polymerized using a thin film polymerization/devolatilization device to produce high molecular weight polymers directly, maintaining stereochemistry and allowing for the incorporation of other monomers and components, thereby reducing recalcitrance and simplifying the synthesis process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lignocellulosic biomass is used as feedstock, then renewable polymer production is enabled, but the compact matrix structure causes recalcitrance to enzyme attack and low hydrolysis yields
Solution Approach 1:
The patent applies pretreatment methods (mechanical, chemical, or biological) to the lignocellulosic biomass before enzymatic hydrolysis to reduce the compact matrix structure's recalcitrance. This preliminary action opens up the dense structure, making cellulose more accessible to enzymes and significantly improving hydrolysis yields without requiring changes to the fundamental enzymatic conversion process
2Ease of manufacture
If indirect synthesis method is used to produce polylactic acid, then polymer can be produced, but intermediate isolation steps increase processing complexity
Solution Approach 1:
The patent combines the polymerization step with the hydrolysis step in a single integrated process. The hydroxy-carboxylic acids produced from enzymatic hydrolysis are directly polymerized in the same reaction system without isolation, purification, or intermediate processing steps. This merging of operations eliminates the complex intermediate handling required in traditional indirect synthesis methods, simplifying the overall manufacturing process and reducing time losses
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 enhances the efficiency of biomass conversion into high molecular weight polymers with preserved stereochemistry, reducing processing complexity and increasing the yield of biodegradable polymers like polylactic acid from lignocellulosic materials.
Implementation Method 1
A method of making a high molecular weight polymer or copolymer from oligomer, the method comprising evaporating water as it is formed during condensation of a hydroxy-carboxylic acid polymer
Data Source
AI summary
Biomass (e.g., plant biomass, animal biomass, and municipal waste biomass) is processed to produce useful intermediates and products, such as aliphatic hydroxy-carboxylic acid and hydroxyl-carboxylic acid derivatives. These aliphatic hydroxy-carboxylic acids are, in turn, polymerized. The polymerization is carried out using a thin film evaporator or a thin film polymerization/devolatilization device. Conversion of lactic acid to poly lactic acid is an especially useful product to this process.