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Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.
Language: English Portuguese
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Bleaching Series (Details)Includes 11 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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The full course is 32 minutes long and available in a number of affordable formats.
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Training Time: 32 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
Chlorine is an excellent chemical for pulp bleaching because of its low cost and lignin removal effectiveness. For these reasons, chlorine was traditionally used in the first bleaching stage to remove up to 90% of the lignin remaining in unbleached pulp. Chlorination is the treatment of pulp with chlorine to solubilize lignin and ultimately bleach the pulp. This course discusses the basics of chlorine bleaching chemistry, the purpose of extraction, and the equipment used in chlorination and extraction.
At the end of this module, you will be able to:
The following key questions are answered in this module:
What is an alkaline extraction stage?An alkaline extraction stage follows a bleaching stage to make the lignin soluble so it can be removed by washing.
What chemicals are used for alkaline extraction?The main chemical for is sodium hydroxide (NaOH). Also, oxygen and/or hydrogen peroxide are often added for better bleaching results.
Why are oxygen and/or hydrogen peroxide added to an alkaline extraction stage?Alkaline extraction conditions are similar to those used for oxygen or peroxide. Adding these chemicals removes additional lignin and helps achieve a higher and more stable final brightness.
What is the retention time for alkaline extraction?A typical retention time is 1-1.5 hours.
What are some of the hazards of sodium hydroxide?Sodium hydroxide is a dangerous chemical that reacts violently with water and acid and it will cause severe chemical burns if it gets on your skin.
Below is a transcript of the video sample provided for this module:
Chlorine Dioxide Awareness
View Course
Bleaching Basics
Bleaching Equipment
Bleaching Sequences and Filtrate Recycling
Chlorine Dioxide Bleaching
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