Membraneless Electrolysis Reactor With Laminar Gas Separation
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Solution Overview
Problem
Membraneless electrolyzers face challenges in maintaining high gas purity and production rates due to intermixing of reaction products, especially at high current densities, and are prone to fouling and increased ohmic losses, which are exacerbated by turbulent or pulsatile flows.
Innovation Solution
A membraneless electrolysis reactor design using a perforated divider or mesh with large openings between electrodes, combined with specific channel ratios and flow angles, ensures efficient separation of reaction products under laminar flow conditions, minimizing pressure drop and ohmic losses while allowing unrestricted ion transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrode-to-electrode distance is increased to promote separation of reaction products, then gas purity is improved, but ohmic losses increase leading to lower power efficiency
Solution Approach 1:
A flow-induced separation mechanism acts as an intermediary between the electrodes, using the liquid flow field to transport gas bubbles toward collection channels without requiring increased electrode spacing. This mediator enables product separation while maintaining small inter-electrode distances and low ohmic losses.
Solution Approach 2:
The invention employs hydraulic flow to achieve gas-liquid separation. The liquid electrolyte flow carries gas bubbles formed at electrodes toward designated collection channels, utilizing fluid dynamics rather than increased spatial separation to achieve product purification.
2Loss of energy
If electrode-to-electrode distance is decreased to minimize ohmic losses, then power efficiency is improved, but product mixing increases and pressure drop rises demanding more pumping power
Solution Approach 1:
The reactor is segmented into distinct functional zones: reaction zones near electrodes where gas is generated, transport zones where flow carries bubbles, and collection zones where gases are gathered. This segmentation allows small inter-electrode distances while maintaining effective product separation through spatial organization of functions.
Solution Approach 2:
The invention changes the parameter of flow velocity and channel geometry to enhance gas bubble transport efficiency. By optimizing flow parameters and channel dimensions, the system achieves effective product separation at small electrode spacings without excessive pressure drops.
3Manufacturing precision
If membrane or diaphragm is used to separate reaction products, then gas purity is improved, but capital costs and operating costs increase due to fouling and limited lifetime
Solution Approach 1:
The invention extracts and removes the membrane/diaphragm component from the system entirely. Instead of using a physical barrier, it employs flow-induced separation mechanisms that achieve product purification without the membrane, thereby eliminating fouling issues and reducing both capital and operating costs.
Solution Approach 2:
The invention replaces expensive, limited-lifetime membranes with simple, durable flow channel structures and geometry-based separation mechanisms. These alternative components have extended lifetimes and do not suffer from fouling, significantly reducing operational costs.
4Productivity
If turbulent or pulsatile flow is used to enhance mixing, then mass transfer is improved, but product intermixing increases and separation efficiency decreases
Solution Approach 1:
The invention employs dynamic flow control with laminar flow conditions that adapt to operational requirements. The flow regime is optimized to provide sufficient mass transfer while maintaining directional control of gas bubbles toward collection channels, preventing intermixing through controlled fluid dynamics rather than turbulent mixing.
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 design achieves high-purity reaction products (≥99%) at high production rates with reduced energy requirements for post-separation, extended lifetime, and lower capital costs, making it suitable for industrial applications.
Implementation Method 1
flow-induced division of the oxidation and reduction products under laminar flow conditions
Implementation Method 2
allows for an unrestricted ion transport between the electrodes, required for the electrochemical reaction
Implementation Method 3
electrochemical reactions that generate a gaseous reaction product from the water or fluid
Data Source
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AI summary
The present application relates to a membraneless electrolysis reactor comprising a flow channel reactor having an inlet and an outlet; a first electrode and a second electrode; a first and a second distal flow channel which are directly connected to the outlet of the flow channel reactor, and an elongated divider or mesh comprising a plurality of openings located in the flow channel reactor between the first and second electrode. The present application further relates to a method of electrochemically producing at least one product, in particular a gaseous product, comprising (i) providing a membraneless electrolysis reactor according to the present application, (ii) flowing a stream of a liquid, particularly an electrolyte or a liquid comprising a reactant, through the flow channel reactor of the membraneless electrolysis reactor, under laminar flow conditions, in contact with the first and the second electrodes, (iii) generating an oxidation reaction product at the first electrode and a reduction reaction product at the second electrode, wherein the perforated divider or mesh and the laminar flow confine the oxidation reaction product and the reduction reaction product to opposing sides of the flow channel reactor.