Ethylene Amine Synthesis via Transamination Selectivity
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Solution Overview
Problem
Current methods for producing higher ethylene amines, such as the EDC route, suffer from low selectivity and the use of toxic ethylene dichloride, resulting in complex mixtures and additional purification steps, while existing alternative routes like reductive amination are inefficient in producing high yields of specific higher ethylene amines.
Innovation Solution
A process involving the reaction of an ethanolamine-functional compound with an amine-functional compound in the presence of a carbon oxide delivering agent, optimizing the molar ratios to enhance selectivity towards specific higher ethylene amines, with the carbon oxide delivering agent being dosed in higher amounts relative to the ethanolamine compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the EDC route is used to produce higher ethylene amines, then production capability is achieved, but selectivity is low and toxic ethylene dichloride is used resulting in complex mixtures requiring additional purification steps
Solution Approach 1:
The invention changes the chemical parameters by using a different reaction pathway - transamination reaction between ethanolamine-functional compounds and amine-functional compounds instead of the traditional EDC route. This parameter change in reaction mechanism achieves high selectivity for specific higher ethylene amines without requiring complex purification steps or toxic ethylene dichloride
Solution Approach 2:
The invention extracts and eliminates the problematic EDC route and toxic ethylene dichloride from the production process. By removing this harmful pathway and replacing it with a cleaner transamination reaction, the process achieves both high selectivity and simplified purification requirements
2Productivity
If reductive amination is used to produce higher ethylene amines, then production is achieved, but efficiency is low and yields of specific higher ethylene amines are poor
Solution Approach 1:
The invention changes the reaction parameters by employing transamination reaction conditions with specific catalysts and molar ratios, replacing the inefficient reductive amination pathway. This parameter optimization enables high yields of specific higher ethylene amines with improved production efficiency
Solution Approach 2:
The invention performs preliminary optimization of reaction conditions including catalyst selection, temperature control, and precise molar ratios of reactants before the main reaction proceeds. This preliminary preparation ensures high efficiency and maximum yield of the desired higher ethylene amines
3Manufacturing precision
If conventional routes are used, then production capability is maintained, but side products are formed requiring additional purification
Solution Approach 1:
The invention changes the reaction parameters by using transamination with controlled molar ratios and specific catalysts, which minimizes side product formation. This parameter control achieves high selectivity for the desired higher ethylene amines and reduces unwanted by-products
Solution Approach 2:
The invention converts the potential harm of side reactions into benefit by carefully controlling reaction conditions to favor the desired transamination pathway. The controlled environment transforms what could be harmful side products into minimal quantities, with the majority of reaction proceeding toward the desired higher ethylene amines
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 process improves the selectivity and reduces side products, allowing for easier recycling of unreacted starting materials and higher yields of specific higher ethylene amines, while minimizing the formation of unwanted by-products.
Implementation Method 1
reacting an ethanolamine-functional compound with an amine-functional compound in the presence of a carbon oxide delivering agent
Data Source
AI summary
A process is provided for preparing ethyleneamines of the formula NH2—(C2H4—NH—)pH wherein p is at least 3, or derivatives thereof wherein one or more units —NH—C2H4—NH— may be present as a cyclic ethylene urea unit or piperazine unit or between two units —NH—C2H4—NH— a carbonyl moiety is present. The process includes reacting an ethanolamine-functional compound OH—(C2H4—NH—)qH wherein q is at least 2, an amine-functional compound NH2—(C2H4—NH—)rH wherein r is at least 1, in the presence of a carbon oxide delivering agent, wherein the molar ratio of ethanolamine-functional compound to amine-functional compound is from about 0.05:1 to about 0.7:1 and the molar ratio of carbon oxide delivering agent to amine-functional compound is higher than the molar ratio of ethanolamine-functional compound to amine-functional compound, provided that the process does not comprise reacting 3 moles of ethylenediamine (EDA) and 1 mole of AEEA (aminoethylethanolamine) in the presence of 1.65 moles of urea at 280 deg C. for 2 hours.