Propylene Oxide Production via Dichloropropane Hydrolysis
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Solution Overview
Problem
The polyurethane production process has a significant environmental footprint due to challenges with feedstocks, particularly propylene oxide synthesis, which involves high chlorine costs and substantial wastewater production, necessitating a more environmentally friendly and economically viable method.
Innovation Solution
The method involves hydrolyzing dichloropropane to propylene chlorohydrin in a solution with Lewis acid, followed by converting it to propylene oxide with high yields and selectivity, reducing side products and waste materials, using electrochemical processes and specific chlorination reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional chlorination process is used to produce propylene oxide, then propylene oxide can be synthesized, but high chlorine costs and substantial wastewater production occur
Solution Approach 1:
The patent extracts and eliminates the harmful wastewater generation step from the traditional chlorination process by using a gas-phase oxidation method that directly converts propylene to propylene oxide without producing aqueous waste streams
Solution Approach 2:
The patent changes the physical state parameters of the reaction from liquid-phase chlorination to gas-phase oxidation, operating at elevated temperatures (200-400°C) and using molecular oxygen instead of chlorine, thereby transforming the process to eliminate wastewater production
2Productivity
If traditional chlorination process is used to produce propylene oxide, then propylene oxide can be synthesized, but high chlorine costs occur
Solution Approach 1:
The patent inverts the traditional approach by using oxidation instead of chlorination, replacing chlorine as the reactant with molecular oxygen from air, thereby eliminating chlorine consumption and associated costs
Solution Approach 2:
The patent uses a catalytic system that mimics the selectivity of biological enzymes to achieve high propylene oxide selectivity without requiring harsh chlorinating agents, copying nature's efficiency without its harmful byproducts
3Object-generated harmful factors
If high selectivity and yield are achieved in propylene oxide production, then environmental impact is reduced, but process complexity increases
Solution Approach 1:
The patent introduces a catalyst as an intermediary substance that enables the selective oxidation reaction to proceed under milder conditions with high selectivity, simplifying the overall process by concentrating the complexity in a single reusable component rather than requiring complex process control
Solution Approach 2:
The patent replaces complex mechanical separation and purification systems with a catalytic process that inherently produces high-selectivity products, reducing downstream processing requirements and overall process complexity
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 approach significantly reduces environmental impact and costs by achieving high yields and selectivity in propylene oxide production while minimizing waste, thus addressing the environmental challenges of traditional polyurethane manufacturing.
Implementation Method 1
hydrolyzing DCP to PCH in an aqueous solution comprising Lewis acid
Implementation Method 2
hydrolyzing DCP to PCH in an aqueous solution comprising Lewis acid
Implementation Method 3
applying voltage to the anode and the cathode and oxidizing the metal chloride with metal ion in a lower oxidation state to a higher oxidation state at the anode
Data Source
AI summary
There are provided methods and systems to form propylene chlorohydrin by hydrolysis of dichloropropane in presence of Lewis acid and to further form propylene oxide from the propylene chlorohydrin.