Kraft Pulping By-Products
Part of the industrial process used to convert wood chips into pulp for use in paper and other cellulosic products, is the kraft pulping process. During the pulping process the wood components are released from the wood or converted into the useful by-products of methanol, turpentine, and tall oil. This module describes where the by-products come from, how they are recovered, and the equipment used to recover them.
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Course Details
Learning Objectives
• Identify the major by-products of the kraft pulping process and how they are used
• Describe where the by-products are produced in the kraft process
• Identify and describe the main components and flows of a methanol stripper
• Describe the principle of operation of the methanol stripper
• Describe the main components and flows in a turpentine system
• Describe the principle of operation of a turpentine system
• Define the safety concerns in the turpentine and methanol systems
• Identify and describe the main components and flows of a soap collection system
• Describe how the soap collection system operates
• Identify and describe the main components and flows of a tall oil system
• Describe how the tall oil system operates
Specs
Frequently Asked Questions
What is the chemical term for the reaction of resin and fatty acids with alkaline cooking liquor to create soap?
Where does most of the soap in the black liquor separate from the black liquor?
How is methanol which is dissolved in condensate separated from the condensate?
How is turpentine which is mixed with condensate separated from that condensate?
What is tall oil used for?
Sample Video Transcript
Soap skimming equipment is used to remove the soap that floats and accumulates on the surface of the black liquor, in the storage tanks. The skimming can be done by extracting the soap layer by special devices that can be adjusted to the correct level within the tank to capture only the soap. The soap removed from the black liquor tanks is pumped to the soap storage tanks at the tall oil system.
