Methods for removing hydrogen peroxide from dilute sulfuric acid
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How to remove 0.5% hydrogen peroxide from 40% dilute sulfuric acid? Since the recycled dilute sulfuric acid used in subsequent processes must not contain hydrogen peroxide, the sulfuric acid concentration of 40% can be appropriately increased to around 60%. These subsequent processes also cannot contain colored ions such as iron; please suggest a cost-effective treatment method. Thank you
This method should work, but the cost……
If sodium bisulfite is available, what kind of reaction will occur? Will it react with sulfuric acid first or with hydrogen peroxide first?
Using sulfur dioxide is an economical method. Of course, the prerequisite is that your gas source is easily accessible.
Take a sample in the laboratory and heat it to boiling to see if hydrogen peroxide can be removed. Whenever possible, avoid chemical methods when physical methods can be used to remove something. Multiple media, multiple processing processes – it’s very annoying.
Baidu states that short-wave light can be used to accelerate the decomposition of hydrogen peroxide. Manganese dioxide can decompose hydrogen peroxide, so it is not suitable for use in this system.
It has been tested in the laboratory, including by increasing the sulfuric acid concentration and raising the temperature; under such conditions, hydrogen peroxide can be partially decomposed, but not completely. This issue remains to be resolved
I’m not in the laboratory anymore, so I can’t conduct experiments. Try this instead: buy an ultraviolet lamp and shine it on the acidic solution that is being heated in a beaker. Pay attention to skin protection; the most important thing is to protect your eyes. Analyze the hydrogen peroxide content based on emission time.
One method is to remove it by heating and stirring； Another method is to add sulfites or introduce sulfur dioxide, which can also remove it
Regarding the concentrated sulfuric acid mentioned by the poster, apart from the limit on the hydrogen peroxide content, are there any restrictions on other impurities? If other impurities also pose significant restrictions, it is recommended to heat and apply appropriate vacuuming to bring the concentration of hydrogen peroxide to an acceptable level. If a small amount of impurities is allowed, sulfur dioxide can be obtained, and a small amount of sodium bisulfite can also be added. A more expensive but also more effective method is to pass sulfuric acid slowly through a noble metal mesh coated with palladium black or platinum black. Manganese dioxide cannot be added, as it reacts with concentrated sulfuric acid to produce oxygen, thereby slowing down the rate of decomposition of hydrogen peroxide.