Peroxide Bleaching
Hydrogen peroxide is a unique bleaching chemical with many applications in the bleach plant. Other bleaching chemicals have specific uses and requirements, but peroxide can be used for delignification or brightening and it doesn’t require any special equipment. Peroxide is often used to reinforce extraction stages in elemental chlorine free (ECF) bleaching sequences. Peroxide use is essential to reaching the target brightness in total chlorine free (TCF) bleaching sequences. This course focuses on peroxide bleaching of chemical pulp, but peroxide is also used extensively for mechanical pulp bleaching.
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Learning Objectives
• Identify and describe hydrogen peroxide safety hazards and guidelines
• Describe properties of hydrogen peroxide
• Differentiate hydrogen peroxide from other bleaching chemicals
• Describe peroxide bleaching chemistry
• List the ways peroxide is used for bleaching
• State the benefits of peroxide bleaching (compared to other chemistries)
• Identify and describe the operating conditions for optimal peroxide bleaching
Specs
| Course Level | Intermediate |
| Languages | English, Portuguese, French |
| Compatibility | Audio, Video |
| Based on: | Industry Standards and Best Practices |
Key Questions
What are the advantages of hydrogen peroxide bleaching?
Peroxide is easy to use because it doesn’t require special equipment and can be used in almost any bleaching stage. Using peroxide reducing the bleaching cost and environmental impact.
How is peroxide used to bleach pulp?
Peroxide can be added to an extraction stage or used alone. It can even be added to pulp storage towers to increase brightness.
Can adding peroxide to a high density storage chest increase the brightness?
Yes, with the right conditions, a small amount of peroxide can increase the brightness 2-3 points.
Does pressure help peroxide bleaching?
Pressurizing a peroxide bleaching stage can improve the results.
Is the peroxide used for bleaching the same as the little brown bottle in my medicine cabinet?
It is 15-25 times more concentrated so it can cause severe chemical burns.
Sample Video Transcript
Hydrogen peroxide is a unique bleaching chemical with many applications in the bleach plant. Other bleaching chemicals have specific uses and requirements, but peroxide can be used for delignification or brightening, and it doesn’t require any special equipment. In fact, peroxide can be added directly to a pulp storage chest to increase the brightness two to three points. Peroxide is often used to reinforce extraction stages in elemental chlorine-free bleaching sequences. This addition increases brightness and reduces chlorine dioxide consumption. Chlorine dioxide use can be reduced further by replacing a final chlorine dioxide stage with a peroxide stage. Peroxide use is essential in reaching the target brightness in total chlorine-free bleaching sequences. This module focuses on peroxide bleaching of chemical pulp. But peroxide is also used extensively for mechanical pulp bleaching.
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