Lignosulfonate Polymerization Using Enzymes and Oxygen Gassing
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Solution Overview
Problem
Existing methods fail to produce lignosulfonate polymers that are substantially entirely lignosulfonate-based without the need for crosslinking additives, which are economically undesirable.
Innovation Solution
A method involving the use of lignosulfonate precursors, radical-forming enzymes like laccases and peroxidases, and oxygen gassing to polymerize lignosulfonate radicals, forming water-insoluble lignosulfonate polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crosslinking additives are used to form copolymers, then lignosulfonate polymers with sufficiently high average molecular weight can be formed to exhibit desired chemical and physical properties, but additional raw materials are required which are economically undesirable
Solution Approach 1:
The invention extracts and eliminates the need for crosslinking additives from the polymerization process. By using enzymatic catalysis with laccase or peroxidase enzymes, the method achieves crosslinking of lignosulfonate units without requiring additional crosslinking substances, thereby resolving the contradiction between achieving desired polymer properties and avoiding additional raw materials
Solution Approach 2:
The lignosulfonate units themselves serve as the polymerizing agents through enzymatic activation. The natural phenolic groups in lignosulfonate react with oxygen in the presence of enzymes to form radicals that self-crosslink, eliminating the need for external crosslinking additives and making the system self-sufficient
2Adaptability or versatility
If conventional polymerization methods are used, then copolymers can be formed, but it is not possible to prepare lignosulfonate polymers that are substantially completely lignosulfonate-based
Solution Approach 1:
The invention applies local quality by creating specific reactive sites on lignosulfonate units through enzymatic oxidation. The laccase or peroxidase enzymes selectively activate phenolic groups at specific locations, enabling controlled polymerization that maintains complete lignosulfonate composition while achieving the necessary reactivity for crosslinking
Solution Approach 2:
The invention changes the chemical state of lignosulfonate by converting phenolic hydroxyl groups to phenoxyl radicals through enzymatic oxidation. This parameter change from reduced to oxidized state enables polymerization while maintaining 100% lignosulfonate composition, resolving the contradiction between composition purity and polymerization capability
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
Produces water-insoluble lignosulfonate polymers with high molecular weight and improved properties, such as water retention and mechanical strength, without the need for crosslinking additives.
Implementation Method 1
adding a radical-forming enzyme and gassing of the lignosulfonate precursor solution with oxygen to form polymerizable lignosulfonate radicals
Implementation Method 2
an important, chemically structural property of the lignosulfonate precursors of the present invention is the presence of reactive phenolic OH groups, which are reducible to an oxygen radical by the radical-forming enzymes/the radical-forming enzyme according to the invention
Implementation Method 3
polymerizing the lignosulfonate precursors
Implementation Method 4
gassing of the lignosulfonate precursor solution with oxygen to form polymerizable lignosulfonate radicals, and polymerizing the lignosulfonate precursors
Data Source
AI summary
A method is provided for preparing a water-insoluble lignosulfonate polymer from a first solution containing lignosulfonate precursors, which involvesa) separating the lignosulfonate precursors from the first solution and providing a second solution with at least 5 wt % of lignosulfonate precursors obtained from the first solution, wherein the separating comprises filtering out components with a predefined particle diameter and separating low-molecular weight components including salts and low-molecular organic compounds,b) adding a radical-forming enzyme and gas to the second solution, wherein the gas comprises oxygen, andc) polymerizing the lignosulfonate precursors of the resultant solution of b).Other related aspects are described and claimed.