Pressurized Packed Bed Catalyst for Chlorine Dioxide Production

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Solution Overview

Problem

The generation of aqueous chlorine dioxide from chlorous acid is challenging, especially in high alkalinity water supplies, due to the slow conversion rate and difficulty in controlling the reaction, particularly when chlorous acid converts to chlorine dioxide.

Innovation Solution

Pressurizing a reaction vessel with a packed bed of porous, water-insoluble catalytic particles while flooding it with a chlorous acid/chloric acid solution significantly increases the conversion rate to chlorine dioxide, ensuring little fluidization of the packed bed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If chlorous acid is allowed to convert to chlorine dioxide in high alkalinity water supplies, then chlorine dioxide is produced, but the conversion rate is slow and the reaction is difficult to control

Engineering Contradiction:

Improveconversion rate to chlorine dioxideVSAvoidcontrollability of reaction

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies pressure to the reaction system as a parameter change to accelerate the conversion of chlorous acid to chlorine dioxide. By increasing pressure, the reaction rate increases significantly, resolving the slow conversion issue while maintaining controllability through the packed bed reactor design.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a packed bed of catalytic particles as an intermediary to facilitate the conversion reaction. The catalyst provides a controlled pathway for the conversion, enabling both faster reaction rates and better control compared to direct conversion in high alkalinity water.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If pressure is applied to the packed bed flooded with acid solution, then the conversion rate to chlorine dioxide increases significantly, but fluidization of the packed bed may occur

Engineering Contradiction:

Improveconversion rate to chlorine dioxideVSAvoidpacked bed stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent carefully controls the pressure parameter to achieve the desired conversion rate while preventing fluidization. By optimizing the pressure range, the system achieves high productivity without compromising the stability of the packed bed structure.

Inventive Principle:

Principle #35Parameter changes

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 enhances the catalytic conversion of chlorous acid to chlorine dioxide, improving the reaction efficiency and allowing for controlled production of aqueous chlorine dioxide solutions.

Implementation Method 1

catalytically converting the chlorous acid in the stream to chlorine dioxide

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

by pressurizing the reaction vessel, either continuously or intermittently, while the catalytic particles are flooded with a chlorous acid/chloric acid solution significantly increases the conversion rate to chlorine dioxide

Methodology Applied

Scientific EffectPressure Increase: Pressure Increase

Data Source

PatentUS11802048B2Pressurized catalytic production of dioxide species

Publication Date: 2023.10.31 DRIPPING WET WATER INC

AI summary

A packed bed catalyst in a pressurized vessel/reactor during contact with a dioxide species precursor enhances catalytic conversion of the precursor to the dioxide species, compared with the same catalytic conversion performed in a non-pressurized vessel/reactor.