In-stream Lignin Modification via Chemical Reagent Injection
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Solution Overview
Problem
The pulp and paper industry produces large amounts of lignin as a byproduct, which is underutilized due to its limited mechanical and other properties, and existing methods for modifying lignin are inefficient, requiring multiple steps and re-dissolving in alkaline solutions.
Innovation Solution
Direct injection of chemical reagents, such as Collins, Fenton's, or Grignard reagents, into the process stream containing lignin to form modified lignins, which can be done in-stream before the precipitation stage, allowing for processes like hydroxyalkylation, alkylation, acylation, or etherification, and subsequent separation, washing, and drying to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods for modifying lignin are used, then lignin can be modified, but the process requires multiple steps and re-dissolving in alkaline solutions, reducing efficiency
Solution Approach 1:
The patent combines multiple separate modification steps into a single integrated process by injecting chemical reagents directly into the black liquor stream. This merging eliminates the need for separate re-dissolving steps in alkaline solutions and reduces the number of unit operations required for lignin modification.
Solution Approach 2:
The patent performs chemical modification of lignin in advance, directly in the black liquor before precipitation. This preliminary action allows the modified lignin to be carried through the precipitation process, eliminating the need for subsequent re-dissolving and re-modification steps that would otherwise be required.
2Manufacturing precision
If multiple process steps are used for lignin modification, then thorough modification can be achieved, but time and resource consumption increase
Solution Approach 1:
The patent maintains continuous chemical modification action by injecting reagents directly into the flowing black liquor stream. This continuous process ensures thorough modification occurs in a single pass through the reactor, eliminating interruptions and time losses associated with batch processing and multiple sequential steps.
Solution Approach 2:
The patent achieves complete modification by optimizing reaction parameters such as reagent injection rate, residence time, and temperature control within a single process stage. These parameter adjustments allow thorough modification to be achieved more quickly than through multiple sequential steps at standard conditions.
3Strength
If conventional lignin processing is used, then standard lignin products are obtained, but enhanced mechanical properties for thermoplastic blends are not achieved
Solution Approach 1:
The patent applies specific chemical modifications at targeted locations within the lignin molecular structure through selective reagent injection. This local quality enhancement creates specific functional groups or structural features that improve mechanical properties in thermoplastic blends without requiring complete restructuring of the entire lignin polymer.
Solution Approach 2:
The patent creates modified lignin with composite-like properties by incorporating chemical modifications that combine the best features of different lignin structures. This results in a hybrid material with enhanced mechanical properties suitable for thermoplastic applications, achieving performance unattainable with conventional single-structure lignin.
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 reduces the steps required for lignin modification, enhances mechanical properties of lignin blends with thermoplastics, and allows for the production of modified lignins like hydroxypropyl lignin, increasing their utility and efficiency in biodegradable and biorenewable materials.
Implementation Method 1
A chemical reagent is directly injected into a process stream that contains one or more lignins to form one or more modified lignins
Implementation Method 2
The formed one or more modified lignins can be formed in the process stream before a precipitation stage
Data Source
AI summary
One example embodiment includes inserting a chemical reagent into a process stream that contains one or more lignins to form one or more modified lignins. The formed one or more modified lignins are different than the one or more lignins in the process stream. The one or more modified lignins can be formed in the process stream before a precipitation stage and then separated from the process stream. Also, contaminates can be removed from the separated one or more modified lignins and the one or more modified lignins can be pressed and dried.