Triethylenetetramine Production via EDDN Hydrogenation
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Solution Overview
Problem
Current processes for preparing triethylenetetramine (TETA) are complex, involve chemical derivatization of starting materials, and result in low selectivity and environmental concerns due to the use of chlorinated hydrocarbons and formation of hydrochloric acid and salts.
Innovation Solution
A process involving the hydrogenation of ethylenediaminediacetonitrile (EDDN) in the presence of a catalyst and solvent, with an amino nitrile mixture comprising at least 30% EDDN and 5% ethylenediaminonoacetonitrile (EDMN), achieving high conversion and selectivity to TETA and diethylenetriamine (DETA) while avoiding the use of chlorinated hydrocarbons and minimizing the formation of cyclic ethylene amines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional processes using chlorinated hydrocarbons are used to prepare TETA, then production can be achieved, but environmental harm increases due to hydrochloric acid and salt formation
Solution Approach 1:
The invention changes the chemical parameters of the starting materials from chlorinated hydrocarbons to nitriles (acetonitrile instead of chloroacetic acid), fundamentally altering the reaction pathway to eliminate harmful byproducts while maintaining TETA production efficiency
Solution Approach 2:
The invention converts the previously harmful chlorinated hydrocarbon route into a beneficial nitrile hydrogenation route, where the reaction naturally produces ammonia and water instead of hydrochloric acid and salts, turning an environmentally harmful process into a clean one
2Productivity
If chemical derivatization of starting materials is used, then TETA can be prepared, but process complexity increases
Solution Approach 1:
The invention extracts and eliminates the unnecessary chemical derivatization steps from the conventional process, using direct hydrogenation of the nitrile group to achieve TETA production in a single, simplified reaction step
Solution Approach 2:
The invention replaces complex chemical derivatization mechanisms with a straightforward catalytic hydrogenation mechanism, using hydrogen gas and a catalyst to directly convert the nitrile to the amine product
3Productivity
If hydrogenation of α-amino nitrites is performed, then TETA can be produced, but selectivity decreases due to hydrogenolysis of C—CN bond or R2N—C bond
Solution Approach 1:
The invention changes the structural parameters of the starting material from α-amino nitrite to β-amino nitrite (ethylenediaminediacetonitrile), where the nitrile groups are positioned on terminal carbons rather than adjacent to the amino group, preventing hydrogenolysis and improving selectivity
Solution Approach 2:
The invention uses a specific catalyst system that mediates the hydrogenation reaction to selectively reduce only the nitrile groups to amines without causing hydrogenolysis of other bonds, achieving high selectivity through catalytic control
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 process achieves high selectivity to TETA and DETA with reduced formation of cyclic ethylene amines, eliminates the need for chlorinated hydrocarbons, and avoids environmental issues associated with hydrochloric acid and salt disposal, allowing for targeted production of ethylene amines with improved economic and environmental outcomes.
Implementation Method 1
hydrogenation of ethylenediaminediacetonitrile (EDDN) over a catalyst
Implementation Method 2
hydrogenation of ethylenediaminediacetonitrile (EDDN) over a catalyst
Data Source
AI summary
The invention relates to a process for preparing triethylenetetramine (TETA), which comprises hydrogenating ethylenediaminediacetonitrile (EDDN) in the presence of a catalyst and a solvent.