Fluidized Bed Catalyst for Ethylene Glycol Selectivity
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Solution Overview
Problem
Current methods for producing ethylene glycol through hydrogenation of oxalate esters suffer from low selectivity and catalyst instability, particularly in the use of copper-based catalysts, which hinder efficient production.
Innovation Solution
A fluidized bed catalytic process using a catalyst comprising copper, silica, molecular sieve, or alumina as carriers, with bismuth, tungsten, cerium, or niobium as promoters, operated at specific temperature and pressure conditions to enhance ethylene glycol selectivity and catalyst stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copper-based catalysts are used for hydrogenation of oxalate esters, then the production process can be simplified, but the selectivity for ethylene glycol is low and catalyst stability is poor
Solution Approach 1:
The patent modifies the catalyst composition by adding promoters (bismuth, tungsten, cerium, or niobium) to the copper-based catalyst and adjusts reaction parameters (temperature 170-270°C, pressure 1.5-10 MPa, hydrogen/ester molar ratio 20-200:1) to achieve high selectivity (90-98%) while maintaining process simplicity
Solution Approach 2:
The patent creates a composite catalyst system combining copper with promoter elements (bismuth, tungsten, cerium, or niobium) supported on silica, molecular sieve, or alumina carriers, which synergistically improves both selectivity and stability while keeping the manufacturing process straightforward
2Productivity
If copper-based catalysts are used for hydrogenation of oxalate esters, then the process can proceed efficiently, but the catalyst stability deteriorates
Solution Approach 1:
The patent develops composite catalysts by incorporating promoter elements (bismuth, tungsten, cerium, or niobium) with copper on stable carriers (silica, molecular sieve, or alumina), creating a structurally robust composite that maintains high productivity while significantly improving catalyst stability and resistance to deactivation
Solution Approach 2:
The patent enhances specific regions of the catalyst by locally distributing promoter elements around copper active sites, creating zones of optimized catalytic activity and stability that maintain high productivity while preventing overall catalyst degradation
3Productivity
If direct hydration of ethylene oxide is used, then the production capacity increases, but the energy consumption increases and overall yield is only 70%
Solution Approach 1:
The patent extracts and eliminates the energy-intensive evaporation and concentration steps required in direct hydration processes by using hydrogenation of oxalate esters, which directly produces ethylene glycol in high yield (90-98%) without generating large amounts of water that would require energy-consuming removal
Solution Approach 2:
The patent changes the fundamental reaction parameters from aqueous-phase hydration to gas-phase hydrogenation, operating at moderate temperatures (170-270°C) and pressures (1.5-10 MPa) to achieve high productivity with significantly reduced energy consumption compared to the high-temperature evaporation steps in conventional processes
4Manufacturing precision
If EC catalytic hydration process is used, then the ethylene glycol selectivity improves, but the catalyst stability and engineering technical problems worsen
Solution Approach 1:
The patent applies composite material principles by combining copper with promoter elements (bismuth, tungsten, cerium, or niobium) on stable carriers, creating a catalyst system that achieves the high selectivity of EC hydration (90-98%) while solving the catalyst stability and engineering technical problems through enhanced structural robustness and resistance to deactivation
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 conversion ratios and selectivity for ethylene glycol, with catalyst stability improved, resulting in efficient production.
Implementation Method 1
contacting the raw materials with the fluidized bed catalyst under the following conditions: reaction temperature being from about 170°C to about 270°C, the space velocity of oxalate weight being from about 0.2 hours−1 to about 7 hours−1, the hydrogen/ester molar ratio being from about 20 to about 200:1, reaction pressure being from about 1.5 MPa to about 10 MPa
Implementation Method 2
A process for producing ethylene glycol from oxalate through the fluidized bed catalytic reaction
Data Source
AI summary
A process for producing ethylene glycol includes contacting an oxalate with a fluidized bed catalyst under the following conditions: a reaction temperature of from about 170 to about 270° C., a weight space velocity of oxalate of from about 0.2 to about 7 hours−1, a hydrogen/ester molar ratio of about 20˜200:1, a reaction pressure of from about 1.5 to about 10 MPa, and a reaction temperature difference T of from about 1 to about 15° C. The fluidized bed catalyst includes: a) from about 5 to about 80 parts by weight of copper and the oxide thereof, b) from about 10 to about 90 parts by weight of at least one carrier selected from silica, molecular sieve or alumina, c) from about 0.01 to about 30 parts by weight of bismuth and tungsten metallic elements or the oxides thereof, or cerium and niobium metallic elements or the oxides thereof.