Tin Alloy Catalyst Carbohydrate Conversion Ethylene Glycol
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Solution Overview
Problem
Current methods for producing ethylene glycol rely on non-renewable petroleum resources, resulting in inefficient, polluting, and costly processes, whereas using renewable carbohydrates as feedstock could provide a sustainable alternative.
Innovation Solution
A method involving catalytic hydrogenation of carbohydrates using alloy catalysts composed of tin and transition metals in a high-pressure reactor under hydrothermal conditions to efficiently produce ethylene glycol, with advantages of easy operation, low cost, and stable catalysts that are easy to recycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-derived ethylene is used as feedstock for ethylene glycol production, then the production process is established and reliable, but the process becomes dependent on non-renewable resources, energy-intensive, and polluting
Solution Approach 1:
The invention changes the fundamental parameter of feedstock from petroleum-derived ethylene to renewable carbohydrates (such as cellulose, hemicellulose, starch). This parameter change transforms the production process from fossil-based to biomass-based, eliminating dependence on non-renewable resources while reducing environmental pollution and energy consumption associated with traditional petrochemical processes
Solution Approach 2:
The invention creates an alternative production route that copies the essential function of ethylene glycol production but uses a different feedstock source (carbohydrates instead of petroleum). This copying approach with renewable resources provides a sustainable alternative that maintains production reliability while eliminating harmful environmental factors
2Productivity
If traditional tungsten-based composite catalysts are used for cellulose conversion, then ethylene glycol can be produced with 60-75% yield, but the catalyst suffers from significant metal leaching and poor hydrothermal stability
Solution Approach 1:
The invention employs a composite catalyst system consisting of transition metal particles (such as Ni, Co, Ru, Rh, Pt, Pd) supported on hydrothermal-stable carriers (such as carbon materials, oxides like TiO2, SiO2, Al2O3, or zeolites). This composite structure combines the high catalytic activity of transition metals with the hydrothermal stability of the carrier, achieving both high ethylene glycol yield (60-75%) and excellent catalyst stability with minimal metal leaching
Solution Approach 2:
The hydrothermal-stable carrier acts as an intermediary that supports the transition metal particles, providing a stable platform that prevents metal aggregation and leaching under hydrothermal conditions. The carrier mediates between the active metal sites and the reaction environment, maintaining catalyst integrity and stability throughout the conversion process
3Ease of manufacture
If selective oxidation or epoxidation steps are included in ethylene glycol production, then the production process follows conventional routes, but the process becomes complex, low efficiency, and produces many by-products
Solution Approach 1:
The invention merges multiple reaction steps (hydrolysis, isomerization, and hydrogenation) into a single integrated catalytic process using transition metal catalysts. This consolidation eliminates the need for separate selective oxidation or epoxidation steps, simplifying the manufacturing process while improving efficiency and reducing by-product formation. The unified catalytic system achieves direct conversion of carbohydrates to ethylene glycol in one operation
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 method achieves high yields of ethylene glycol with reduced leaching and excellent hydrothermal stability, promoting sustainable production and reducing environmental impact.
Implementation Method 1
catalytic hydrogenation of carbohydrates using alloy catalysts composed of tin and transition metals
Implementation Method 2
catalytic hydrogenation in high pressure reactor in water
Data Source
AI summary
This invention provides a method for catalytic conversion of carbohydrates to low-carbon diols using alloy catalysts. In the process, carbohydrates as the feedstock are subjected to one-step catalytic conversion to realize the highly efficient and selective production of ethylene glycol etc. under hydrothermal conditions, with an alloy catalyst composed of tin, and a transition metal such as iron, cobalt, nickel, rhodium, ruthenium, palladium, iridium, platinum and copper, or a mixture thereof. The reaction is carried out in water at a temperature range of 120-300° C., with a hydrogen pressure range of 1-13 MPa. Compared with the present petroleum based synthesis technology of ethylene glycol, the method in this invention possesses advantages of using renewable feedstock, high atom economy and environmental friendly. Besides, compared with other technologies using biomass as feedstock to produce ethylene glycol, the alloy catalyst in this invention possesses the advantages of few leaching amount, good hydrothermal stability and easy to recycle.