Tannin-Triazine Polymer Formaldehyde Reduction
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Solution Overview
Problem
The production of tannin/amine/formaldehyde reaction products faces challenges such as complex manufacturing processes, unstable products, byproduct formation, foaming issues, high formaldehyde levels posing health and environmental hazards, and difficulties in removing residual formaldehyde, leading to increased costs and toxicity.
Innovation Solution
A method involving the reaction of tannin, triazine, and an acid under heated conditions in a liquid medium to form amine functionalized tannin-based polymer compounds, which reduces formaldehyde levels and stabilizes the product, using triazines like alkyl or hydroxylated s-triazine with acids like hydrochloric acid, and applying the resulting products for water clarification and coal stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the temperature or time of the tannin/amine/formaldehyde reaction is increased to drive residual formaldehyde to less than 1,000 ppm, then formaldehyde levels are reduced, but unwanted crosslinking of tannin, gelling and solidification of product batches occurs
Solution Approach 1:
The patent introduces triazine as an intermediary reactant that mediates between tannin and formaldehyde. The triazine reacts with formaldehyde to form a stable hydrazone linkage, effectively sequestering formaldehyde without requiring high reaction temperatures or extended times that would cause tannin crosslinking and product solidification. This intermediary mechanism allows formaldehyde reduction while maintaining product stability.
Solution Approach 2:
The patent changes the reaction parameters by introducing triazine as a new reactant component, altering the reaction pathway from direct tannin/amine/formaldehyde condensation to a multi-step process involving triazine hydrazone formation. This parameter change enables formaldehyde reduction at milder conditions, avoiding the unwanted crosslinking and gelling that occur with conventional high-temperature or long-duration reactions.
2Object-affected harmful factors
If multiple stoichiometric excesses of formaldehyde scavenger are used to reduce formaldehyde concentration, then formaldehyde levels are reduced, but costs increase, toxicity increases, and activity of the desired amine/tannin product is reduced
Solution Approach 1:
The patent extracts the formaldehyde scavenging function from separate additive compounds and integrates it into the triazine reactant itself. The triazine molecule inherently contains the capacity to bind and sequester formaldehyde through hydrazone formation, eliminating the need for multiple stoichiometric excesses of external scavengers. This integration reduces cost, minimizes toxicity, and preserves amine/tannin product activity.
3Productivity
If conventional tannin/amine/formaldehyde reaction products are manufactured, then water clarification performance is achieved, but complex manufacturing processes and sensitive manufacturing conditions are required
Solution Approach 1:
The patent segments the manufacturing process into distinct functional steps: (1) reaction of triazine with formaldehyde to form hydrazone intermediate, (2) reaction of hydrazone with amine to form stable product, and (3) filtration to remove solids. This segmentation allows each step to be optimized independently and simplifies the overall process compared to conventional one-pot tannin/amine/formaldehyde condensation, reducing manufacturing complexity while maintaining water clarification performance.
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
The method effectively reduces formaldehyde levels below 1,000 ppm, stabilizes the product, and provides a cost-effective solution for water clarification and coal stabilization, while minimizing health and environmental risks.
Implementation Method 1
reacting tannin, triazine and an acid under heated conditions in a liquid medium to form amine functionalized tannin based polymer compounds
Implementation Method 2
reacting tannin, triazine and an acid under heated conditions
Data Source
Figure 1
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AI summary
Methods of reacting tannin/triazine and acid in a liquid medium and reaction products prepared by these methods. The reaction products may be used in a variety of water clarification applications and may also be utilized to inhibit coal auto oxidation and dust dissemination from coal mining, coal storage and coal transport applications.