Zeolite Catalyst Gas-Phase Ethylene Oxide Conversion
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Solution Overview
Problem
Current methods for producing ethylenediamine from ethylene oxide require high pressures and result in the formation of by-products like diethanolamine and triethanolamine, necessitating costly apparatus and safety measures, while existing gas-phase processes are not efficient for producing monoethanolamine and ethylenediamine from simpler starting materials.
Innovation Solution
A process utilizing a zeolitic catalyst with a MOR framework structure, comprising YO2 and X2O3, where Y is a tetravalent element and X is a trivalent element, to convert ethylene oxide to 2-aminoethanol and ethane-1,2-diamine in the gas phase using a gas stream of ethylene oxide and ammonia, achieving high selectivity and conversion rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid phase amination of ethylene oxide is used to produce monoethanolamine, then the reaction can proceed, but very high pressures are required and diethanolamine and triethanolamine by-products are formed
Solution Approach 1:
The patent transitions the reaction from liquid phase to gas phase, eliminating the need for very high pressures while maintaining product formation. The gas-phase process uses a zeolite catalyst to facilitate the amination reaction between ethylene oxide and ammonia, achieving selective production of monoethanolamine without requiring the extreme pressures needed in liquid-phase processes.
Solution Approach 2:
The patent employs a zeolite catalyst with porous structure (specifically H-ZSM-5 or H-Beta zeolite) that provides selective catalytic activity in the gas phase. The porous structure and acid sites of the zeolite enable the reaction to proceed at lower pressures while maintaining high selectivity for monoethanolamine, preventing the formation of diethanolamine and triethanolamine by-products.
2Quantity of substance
If liquid phase amination of ethylene oxide is used to produce monoethanolamine, then the reaction can proceed, but costly apparatus and safety measures are required
Solution Approach 1:
By switching from liquid phase to gas phase reaction, the patent eliminates the need for pressure vessels and complex safety systems required for high-pressure liquid-phase operations. The gas-phase process can be conducted in simpler fixed-bed reactors with zeolite catalyst, reducing apparatus complexity and safety requirements while maintaining productive yield.
3Stress or pressure
If existing gas-phase processes are used for amination, then pressure requirements are reduced, but they are not efficient for producing monoethanolamine and ethylenediamine from simpler starting materials
Solution Approach 1:
The patent uses H-ZSM-5 or H-Beta zeolite catalysts with specific porous structures and acid site distributions that enhance reaction efficiency in the gas phase. These zeolites provide optimal catalytic activity for the amination of ethylene oxide with ammonia, achieving high conversion rates and selectivity for both monoethanolamine and ethylenediamine production under mild pressure conditions.
Solution Approach 2:
The patent optimizes gas-phase reaction parameters including temperature, pressure, and reactant ratios to maximize productivity. By carefully controlling these parameters in conjunction with the zeolite catalyst, the process achieves high efficiency in producing both monoethanolamine and ethylenediamine from ethylene oxide and ammonia, overcoming the inefficiency of conventional gas-phase processes.
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 allows for the efficient and selective production of monoethanolamine and ethylenediamine in the gas phase at reduced pressures, eliminating the need for costly equipment and safety measures, and improving the yield of desired products.
Implementation Method 1
a process for the conversion of ethylene oxide to 2-aminoethanol and ethane-1,2-diamine comprising (i) providing a catalyst comprising a zeolitic material
Data Source
AI summary
The present invention relates to a process for the conversion of ethylene oxide to 2-aminoethanol and/or ethane-1,2-diamine and/or linear polyethylenimines of the formula H2N- (CH2CH2NH)n-CH2CH2-NH2 wherein n≥ 1 comprising (i) providing a catalyst comprising a zeolitic material comprising YO2 and X2O3, wherein Y is a tetravalent element and X is a trivalent element; (ii) providing a gas stream comprising ethylene oxide and ammonia; (iii) contacting the catalyst provided in (i) with the gas stream provided in (ii) for converting ethylene oxide to 2-aminoethanol and/or ethane-1,2-diamine and/or linear polyethylenimines.