Heterogeneous Catalyst Synthesis of Primary Isohexide Amines
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Solution Overview
Problem
Current methods for producing isohexide amines are inefficient for large-scale production due to the use of expensive noble metal complexes, complex synthesis processes, and challenging reaction conditions, making it difficult to scale up the production of biogenic amines for industrial applications.
Innovation Solution
A process using heterogeneous catalysis with commercially available hydrogenation catalysts, such as Ru/C, to convert dianhydrohexitols into primary amines under mild reaction conditions in aqueous solutions or solvent-free systems, allowing for the separation of catalysts and enabling industrial-scale production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If homogeneous catalysis with noble metal complexes is used, then the amination reaction can proceed, but the catalyst is expensive, sensitive to air and water, and difficult to separate from the product
Solution Approach 1:
The patent replaces expensive noble metal complexes with inexpensive heterogeneous catalysts such as metal oxides (e.g., tungsten oxide, molybdenum oxide) or activated carbon. These alternative catalysts are significantly cheaper, more stable towards air and water, and can be easily separated from the product mixture through filtration, thereby resolving the contradictions of cost, stability, and separation difficulty.
Solution Approach 2:
The patent transitions from homogeneous catalysis (molecular-level interaction) to heterogeneous catalysis (surface-level interaction). This substitution allows the catalyst to be in a different phase (solid) than the reactants (liquid or gas), enabling simple physical separation through filtration while maintaining catalytic activity through surface reactions.
2Manufacturing precision
If uncatalyzed multi-stage syntheses are used, then the amination can be achieved, but the process requires highly reactive and toxic intermediates and cannot be scaled up
Solution Approach 1:
The patent introduces a catalyst as an intermediary substance that facilitates the amination reaction. The catalyst provides an alternative reaction pathway with lower activation energy, enabling the reaction to proceed under milder conditions without forming highly reactive and toxic intermediates. This intermediary approach makes the process safe and scalable for industrial production.
3Manufacturing precision
If laboratory-scale synthesis routes are used, then the amination can be performed, but the formation of stoichiometric amounts of by-products prevents scale-up
Solution Approach 1:
The patent changes the reaction parameters by introducing a catalyst that selectively promotes the desired amination reaction while suppressing side reactions. This parameter change (adding catalyst) leads to higher selectivity and fewer stoichiometric by-products, enabling the process to be scaled up industrially without the waste management issues associated with laboratory methods.
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 provides a scalable, economical, and selective process for producing isohexide amines, overcoming the limitations of previous methods by using readily available catalysts and simplifying reaction conditions, enabling the production of biogenic amines for use in plastics and other chemical products.
Implementation Method 1
the amination is carried out by means of heterogeneous catalysis using a hydrogenation catalyst in the presence of hydrogen
Implementation Method 2
amination of the dianhydrohexitol by reacting with ammonia, wherein the amination is carried out by means of heterogeneous catalysis using a hydrogenation catalyst in the presence of hydrogen
Data Source
Figure 1
AI summary
The invention relates to a method for synthesizing a primary amine, comprising the steps of: a) providing at least one dianhydrohexitol, and b) aminating the dianhydrohexitol by reacting same with ammonia, the amination being performed by heterogeneous catalysis using a hydrogenation catalyst in the presence of hydrogen.