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Language: English Portuguese
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Recaust Series (Details)Includes 12 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 14 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
The kraft chemical pulping process produces strong pulp because of the special characteristics of the cooking liquor. The presence of sodium sulfide (Na2S) in combination with the sodium hydroxide (NaOH) in the cooking liquor, protects the pulp fibers from degradation during the cooking process. The control of the chemical composition of the cooking liquor is critical for production of strong pulp fibers. The liquor testing in the recausticizing process provides critical information for that control. This module provides information about the liquor testing in the recausticizing process, what those test results mean, and why it is important to the processes involved.
Kraft Pulping Liquor Chemistry
View Course
Lime Kiln Fundamentals
Lime Mud Filtering
Recausticizing Fundamentals
Slaking and Causticizing
The following key questions are answered in this module:
What is recausticizing?Recausticizing is the process of converting the chemicals in spent cooking liquor back to their original form so that they can be re-used in the kraft pulping process.
What is the ABC test?The ABC test is titration with three endpoints which give the concentrations of sodium hydroxide, sodium sulfide and sodium carbonate.
What are some measures of alkality that can come from the ABC test?There are several measures of alkalinity; they include Total Titratable Alkali (TTA), Active Alkali (AA), Effective Alkali (EA), and Activity.
What is sulfidity?Sulfidity is a measure of the ratio of sodium sulfide to the other sodium species in the green or white liquor.
What are the primary chemicals found in white liquor?The primary chemicals in cooking liquor, or white liquor, are sodium hydroxide and sodium sulfide.
Below is a transcript of the video sample provided for this module:
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