Anthraquinone Process Condensate Purification for Hydrogen Peroxide Stability
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Solution Overview
Problem
The anthraquinone process for producing hydrogen peroxide experiences increased decomposition and storage instability when recycling condensate from vapor compression, leading to impurities like dissolved iron, which can inhibit biological activity in wastewater treatment and require excessive deionized water consumption.
Innovation Solution
Purifying the condensate using a cation exchange resin in its protonated form before recycling it to the extraction or distillation steps, reducing hydrogen peroxide decomposition and minimizing waste water treatment and deionized water usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If condensate from vapor compression is recycled to the extraction step, then deionized water consumption is reduced, but hydrogen peroxide decomposition increases and storage stability deteriorates
Solution Approach 1:
The condensate is purified by passing it through a cation exchange resin bed before recycling to the extraction step. This preliminary purification action removes metal ions that would otherwise catalyze hydrogen peroxide decomposition, allowing the condensate to be safely recycled without compromising product stability.
Solution Approach 2:
A cation exchange resin bed is introduced as an intermediary purification step between the vapor compression unit and the extraction step. The resin acts as a mediator that selectively removes harmful metal ions from the condensate while allowing water to pass through, enabling safe recycling.
2Loss of substance
If condensate from vapor compression is recycled, then waste water treatment load is reduced, but hydrogen peroxide decomposition increases due to impurities like dissolved iron
Solution Approach 1:
The cation exchange resin converts the harmful effect of metal ions in condensate by selectively binding and removing them. The resin transforms the potentially harmful condensate into a beneficial recycled water source that can be safely returned to the extraction step without causing hydrogen peroxide decomposition.
Solution Approach 2:
Purification of condensate through cation exchange resin occurs before recycling to prevent hydrogen peroxide decomposition. This preliminary removal of metal ions eliminates the harmful effect before the condensate re-enters the hydrogen peroxide production process.
3Use of energy by moving object
If steam driven ejector is used for vapor compression, then energy consumption is reduced, but hydrogen peroxide decomposition increases and storage stability decreases
Solution Approach 1:
The cation exchange resin bed serves as an intermediary purification system between the steam driven ejector and the extraction step. It removes metal ions from the condensate that would otherwise be introduced into the hydrogen peroxide process, enabling the use of energy-efficient steam driven ejectors without compromising product stability.
Solution Approach 2:
Harmful metal ions are extracted and removed from the condensate stream using the cation exchange resin. This extraction of impurities allows the condensate to be safely recycled while maintaining hydrogen peroxide storage stability, even when using steam driven ejectors for vapor compression.
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 prevents hydrogen peroxide decomposition, enhances storage stability, reduces waste water treatment load, and conserves deionized water by recycling purified condensate, thereby improving the overall efficiency of the hydrogen peroxide production process.
Implementation Method 1
purifying the condensate with a cation exchange resin in its protonated form
Implementation Method 2
concentrating hydrogen peroxide with vapor compression
Implementation Method 3
concentrated to 45 to 70% by weight by evaporating water at reduced pressure
Implementation Method 4
condensate from this evaporation step
Data Source
AI summary
In a cyclic anthraquinone process for producing hydrogen peroxide, which comprises a distillation unit with vapor compression for concentrating hydrogen peroxide, aqueous condensate from the distillation unit is passed over a bed of a cation exchange resin in its protonated from to provide a purified condensate, and the purified condensate is used as extractant for extracting hydrogen peroxide in the anthraquinone process, as column reflux for the distillation unit or as a diluent for diluting an aqueous hydrogen peroxide solution.