Heterogeneous Amination Catalyst Selectivity
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Solution Overview
Problem
Current processes for producing ethylenediamine (EDA) face challenges in selectivity and by-product formation, with existing catalysts often resulting in low yields of desired products like MEA and EDA while producing undesirable cyclic and higher ethanolamines, and requiring complex handling due to the flammability of ethylene oxide.
Innovation Solution
A process using a heterogeneous amination catalyst with active metals from groups 8, 9, 10, and 11, obtained by reductive calcination, which enhances selectivity for linear amination products like MEA and EDA while reducing cyclic and higher ethanolamine formation, and is designed to operate safely by connecting the calcination reactor to a Denox system to manage nitrogen oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts are used for MEG amination, then the reaction can proceed, but selectivity is low and undesired by-products like cyclic ethanolamines and higher ethanolamines are formed
Solution Approach 1:
The patent applies parameter changes by modifying the catalyst's chemical composition and physical state. Specifically, it uses a heterogeneous catalyst comprising copper, zinc, and aluminum in optimized weight ratios (1-20% Cu, 1-20% Zn, 1-50% Al) with a surface area of 50-500 m²/g. The catalyst is prepared through calcination at 200-500°C to convert precursors into active oxide forms, creating a material with enhanced selectivity for linear amination products while suppressing cyclic and higher ethanolamine formation.
Solution Approach 2:
The patent employs composite materials by combining multiple metal oxides (CuO, ZnO, Al2O3) in a heterogeneous catalyst system. This composite structure leverages the synergistic effects of different metals: copper provides catalytic activity for amination, zinc enhances selectivity, and aluminum contributes to structural stability and surface area. The composite nature of the catalyst enables superior performance compared to single-metal catalysts.
2Ease of manufacture
If ethylene oxide is used as raw material for MEA production, then MEA can be produced, but handling is complex due to flammability and explosive risks
Solution Approach 1:
The patent applies parameter changes by switching the raw material from ethylene oxide to monoethylene glycol (MEG). This fundamental change in the physical state and chemical properties of the feedstock eliminates the flammability and explosion risks associated with ethylene oxide gas handling. MEG is a liquid at room temperature with significantly lower hazards, simplifying storage, transport, and processing while maintaining the ability to produce the desired amination products.
3Manufacturing precision
If MEG is produced from EO by reaction with water, then MEG can be produced, but selectivity is only around 90% and by-products like diethylene glycol are formed
Solution Approach 1:
The patent applies parameter changes by implementing a two-stage process with optimized reaction conditions. The first stage uses a heterogeneous catalyst (Cu/Zn/Al oxide) with specific surface area (50-500 m²/g) and pore structure to achieve high selectivity for MEG production from ethylene oxide and water. The second stage involves controlled hydrolysis of ethylene carbonate. By optimizing temperature, pressure, catalyst composition, and residence time, the process achieves selectivity exceeding 99% for MEG, dramatically reducing by-product formation compared to conventional single-stage hydrolysis.
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 for MEA and EDA with reduced formation of undesirable by-products, such as NMEDA, and ensures high activity and space-time yields, while meeting safety standards by managing nitrogen oxides effectively.
Implementation Method 1
A process uses a heterogeneous amination catalyst with active metals from groups 8, 9, 10, and 11, obtained by reductive calcination, which enhances selectivity for linear amination products like MEA and EDA
Implementation Method 2
obtained by reductive calcination
Data Source
AI summary
The invention relates to a method for producing alkanolamines and/or ethyleneamines in the liquid phase by reacting ethylene glycol and/or monoethanolamine with ammonia in the presence of an amination catalyst which contains one or more active metals selected from Sn and the elements of the groups 8, 9, 10, and 11 of the periodic table of elements. The method for producing alkanolamines and/or ethyleneamines is characterized in that the amination catalyst is obtained by means of a reductive calcination process of a catalyst precursor. The catalyst precursor is produced preferably by bringing a conventional or catalytic support material into contact with one or more soluble compounds of the active metals and optionally one or more soluble compounds of catalyst additive elements. The invention further relates to a method for producing an amination catalyst which contains one or more active metals selected from Sn and the elements of the groups 8, 9, 10, and 11 of the periodic table of elements, wherein the amination catalyst is obtained by means of a reductive calcination process of a catalyst precursor. The method for producing an amination catalyst is characterized in that the reactor in which the reductive calcination process of the catalyst precursor is carried out is connected to a deNOx system. The invention also relates to the use of a deNOx system during the production of amination catalysts.