Kraft Pulping Liquor Chemistry

SKU: C-628Duration: 31 Minutes

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.


Great for trainers or groups who need unlimited online access to multiple courses. Available in two ways:

Kraft Pulping Series (Details)
Includes 12 courses for $499/year.

Pulping Library (Details)
Includes 72 courses for $1,499/year.

Ideal for corporate licensing and high volume users.

Get Convergence courses into your current LMS to track and report employee training. Or contact us to learn more about the advantages of licensing our courses with the Convergence LMS.

Course Details


Training Time: 31 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, Polish, Russian

Kraft pulping is a process which uses chemicals to convert wood chips into individual fibers to make paper or other cellulose-based products. There are a number of chemical processes for pulping wood, but the kraft process is by far the most prevalent. One reason for this is that the chemicals in the cooking liquor can be recovered, recycled, and used again. This module will cover the chemistry of kraft cooking, the testing of the cooking liquor, and the process for reclaiming the active cooking chemicals.

Learning Objectives

At the end of this module, you will be able to:

  • Identify the major compounds, which make up wood
  • Describe white liquor and its chemical makeup
  • Identify the major steps in the kraft liquor cycle
  • Describe how wood is "cooked" to become pulp
  • Describe how to determine AA, EA, TTA, and sulfidity
  • Describe the hazards associated with cooking liquors
  • Describe the impact of high chlorides in the liquor cycle
  • Describe how chlorides can be removed from liquor

Key Questions

The following key questions are answered in this module:

What is the ""liquor cycle"" in the kraft pulping process?
The term ""liquor cycle"" refers to a sequence of processes which reclaim and recover the primary chemical components from spent cooking liquor for reuse.

What is the chemical compound use in the kraft pulping process which increase yield and fiber strength?
The compound which is added to enhance cooking liquor is sodium sulfide (Na2S).

What the ""color"" name for the liquor which is put into digester to cook chips?
Liquor charged to the digester for cooking is called ""white liquor"".

What is a common laboratory test which yields alkalinity and sulfidity values for a liquor sample.
The commonly used triation for testing alkalinity is called the ""ABC test"".

What is the term for chemical compounds which are not involved in the primary liquor reactions, but can have a large effect on operations.
These non-primary compounds are called ""non process elements"".

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

Before discussing the chemistry of pulping, it is important to know something about the composition of wood. Wood is made up of a wide variety of complex, organic compounds. The three main compounds are cellulose, hemicelluloses, and lignin. Cellulose makes up 40% to 45% of the dry weight of wood, and it consists of long, straight, strong chains of glucose molecules. Hemicelluloses are shorter branched chains of glucose and other sugars which are not as strong as cellulose. The amount of hemicelluloses in dry wood is typically between 20% and 30%. Cellulose and hemicelluloses function as supporting materials in the cell walls in wood fibers. Lignin refers to a group of organic compounds which are present in the outer layers of the cell walls and serve as the glue which holds the fibers together.

Customer Q&A

I would like to have several employees take multiple courses. How can I set that up?

We're in the process of making bulk course and multiple user purchases easier. But for now, you can order multiple courses and contact us with details on who you'd like to assign courses to. We can set up each user's training plan and make sure everyone gets the eLearning assignments they need.

Can I get a free full-length preview of a course to see what this course covers?

While we do our best to offer details on course contents, we don't normally offer full-length previews. But please contact us with more details for a better understanding of what your organizaton needs and how we can help.

Do I get a certificate when I complete a course?

Yes. All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of each eLearning course.

How do I log in to take a course that I have already paid for?

You'll receive an email with login details moments after you purchase your pay-per-view (PPV) course. Just click the login link and enter the user name and password provided.

Do you have courses in different languages?

Yes. While all of our courses are originally produced in English, we develop many courses in a growing number of languages, including Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish, Tamil, and Thai. Available languages are normally displayed in the Course Details section on each course page.
Added to Cart! Click here to view your cart.