Hydrogen Peroxide Purification via Vaporization and Recycle

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Solution Overview

Problem

Conventional methods for purifying and concentrating crude aqueous hydrogen peroxide solutions in the electronics industry produce high-purity solutions in small quantities but also generate significant amounts of impurities, making them unsuitable for high-purity applications.

Innovation Solution

A method involving vaporization, condensation, recycling of the separated liquid, and control of hydrogen peroxide concentration, along with impurity removal using ion-exchange resins and addition of stabilizers, to produce a high-purity aqueous hydrogen peroxide solution with improved stability and reduced impurities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional vaporization and rectification methods are used to purify crude aqueous hydrogen peroxide solution, then high-purity solution can be obtained, but the production quantity is limited and impurities remain in the general purity solution

Engineering Contradiction:

Improvepurity of hydrogen peroxide solutionVSAvoidproduction quantity of high-purity solution

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The invention divides the purification process into two distinct streams: a first stream for high-purity production through rectification, and a second stream for recovering general-purity solution from the gas-liquid separator. This segmentation allows both high-purity and medium-purity products to be produced simultaneously, increasing overall productivity while maintaining high-purity quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of discarding the liquid phase from the gas-liquid separator which contains impurities, the invention recycles it back to the vaporization step after adjusting its hydrogen peroxide concentration. This recovery and reuse of material increases overall production efficiency and reduces waste.

Inventive Principle:

Principle #34Discarding and recovering

2Ease of operation

If the liquid phase from gas-liquid separator is discarded, then simple operation is maintained, but production efficiency is reduced

Engineering Contradiction:

Improveoperational simplicityVSAvoidproduction efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The invention recovers the liquid phase from the gas-liquid separator by adjusting its hydrogen peroxide concentration to match the raw material concentration, then recycling it to the vaporization step. This transforms waste material into useful feedstock, significantly improving production efficiency without adding complex operational steps.

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The system implements a feedback loop where the liquid phase concentration is measured and adjusted (through water addition or concentration) before being fed back to the vaporization step. This closed-loop control ensures optimal recycling conditions while maintaining operational simplicity.

Inventive Principle:

Principle #23Feedback

3Device complexity

If hydrogen peroxide concentration in recycled liquid is not controlled, then process complexity is reduced, but impurity removal efficiency decreases

Engineering Contradiction:

Improveprocess complexityVSAvoidimpurity removal efficiency

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The invention controls the hydrogen peroxide concentration parameter of the recycled liquid to match the raw material concentration. This parameter control is achieved through simple water addition or concentration steps, which are straightforward operations that do not significantly increase process complexity while dramatically improving impurity removal efficiency in the rectification step.

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 achieves higher production efficiency and significantly reduces organic impurity content, enhancing the purity and stability of the aqueous hydrogen peroxide solution, making it suitable for high-purity applications in the electronics industry.

Implementation Method 1

a crude aqueous hydrogen peroxide solution which is a raw material is fed to a vaporizer (12) and vaporized

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

gas liquor from the vaporizer (12) passes through a gas-liquid separator (14) and is condensed and separated into vapor containing hydrogen peroxide and an aqueous hydrogen peroxide solution

Methodology Applied

Scientific EffectCondensation: Condensation

Data Source

PatentUS11220430B2Method and system for producing purified aqueous hydrogen peroxide solution

Publication Date: 2022.01.11 MITSUBISHI GAS CHEM CO INC

AI summary

Provided are a method and system for efficiently producing a purified aqueous hydrogen peroxide solution having a high purity. This method for producing a purified aqueous hydrogen peroxide solution comprises: step A for vaporizing a raw material containing a crude aqueous hydrogen peroxide solution; step B for condensing at least a portion of the gas and liquid obtained in step A, and separating the gas and liquid into a gas phase and a liquid phase; and step C for returning, into the raw material, at least a portion of a separation liquid which is the separated liquid phase, wherein step C further includes step D for adjusting the concentration of hydrogen peroxide in the separation liquid.