One-Step Catalytic Hydrogenation of Polyhydroxy Compounds
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Solution Overview
Problem
Conventional methods for producing ethylene glycol from petroleum-based raw materials are inefficient, environmentally polluting, and dependent on non-renewable resources, with low ethylene glycol yields and complex processes.
Innovation Solution
A one-step catalytic hydrogenation process using a physical catalyst mixture comprising transition metals and tungsten compounds to degrade polyhydroxy compounds such as cellulose and starch, achieving high ethylene glycol yields and selectivity under hydrothermal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional three-step hydrogenolysis process is used to produce ethylene glycol from polyhydroxy compounds, then ethylene glycol can be produced, but the process is complex and the yield is low (10-30%)
Solution Approach 1:
The patent combines gelatinization, hydrogenation, and hydrogenolysis steps into a single one-step catalytic hydrogenation process using a physical catalyst mixture, eliminating the need for separate processing stages and achieving both process simplification and improved ethylene glycol yield (50-70%)
Solution Approach 2:
The patent employs a composite physical catalyst mixture comprising tungsten carbide and transition metals (such as nickel, iron, or cobalt) that integrates multiple catalytic functions into a single material system, enabling simultaneous gelatinization, hydrogenation, and hydrogenolysis activities with enhanced efficiency
2Ease of manufacture
If petroleum-based raw materials are used for ethylene glycol production, then conventional production can be achieved, but it relies on non-renewable resources and produces serious pollution
Solution Approach 1:
The patent changes the fundamental parameter of raw material source from non-renewable petroleum-based feedstocks to renewable polyhydroxy compounds (such as cellulose, starch, or glucose), fundamentally altering the production system to be environmentally sustainable while maintaining production feasibility through established catalytic hydrogenation technology
Solution Approach 2:
The patent converts abundant renewable biomass resources into valuable ethylene glycol products, transforming what could be considered agricultural waste or less valuable feedstocks into high-demand chemical products, thereby turning resource abundance into economic and environmental benefit
3Productivity
If conventional epoxidation and hydration steps are used, then ethylene glycol can be produced, but the technical difficulty increases and material consumption increases
Solution Approach 1:
The patent extracts and eliminates the intermediate epoxidation step from the conventional synthesis pathway, proceeding directly from polyhydroxy compounds to ethylene glycol through catalytic hydrogenation and hydrogenolysis, thereby reducing both process complexity and material consumption while maintaining high production efficiency
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 provides a high yield of ethylene glycol (>50%) with high selectivity, using renewable raw materials, reducing environmental impact and operational complexity, and lowering catalyst costs, making it suitable for commercialization.
Implementation Method 1
degraded in one-step catalytic hydrogenation to produce ethylene glycol with high yield and high selectivity
Implementation Method 2
catalytic hydrogenation in water
Data Source
AI summary
This invention provides methods for producing ethylene glycol from polyhydroxy compounds such as cellulose, starch, hemicellulose, glucose, sucrose, fructose, fructan, xylose and soluble xylooligosaccharides. The methods uses polyhydroxy compounds as the reactant, a composite catalyst having active components comprising one or more transition metals of Groups 8, 9, or 10, including iron, cobalt, nickel, ruthenium, rhodium, palladium, iridium, and platinum, as well as tungsten oxide, tungsten sulfide, tungsten hydroxide, tungsten chloride, tungsten bronze oxide, tungsten acid, tungstate, metatungstate acid, metatungstate, paratungstate acid, paratungstate, peroxotungstic acid, pertungstate, heteropoly acid containing tungsten. Reacting at a temperature of 120-300 °C and a hydrogen pressure of 1-13 MPa under hydrothermal conditions to accomplish one-step catalytic conversion. It realizes efficient, highly selective, high yield preparation of ethylene glycol and proplyene glycol from polyhydroxy compounds. The advantage of processes disclosed in this invention include renewable raw material and high atom economy. At the same time, compared with other technologies that converts biomass raw materials into polyols, methods disclosed herein enjoy advantages including simple reaction process, high yield of targeted products, as well as easy preparation and low cost for the catalysts.