Chlorine Dioxide Generation

SKU: C-679Duration: 21 Minutes

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Course Details


Training Time: 21 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, French, Polish, Russian

Chlorine dioxide is an excellent bleaching chemical because it is very selective for lignin. Because of this, its use has expanded greatly over the last few decades. This course discusses how chlorine dioxide is generated at a pulp mill along with the different processes that utilize chlorine dioxide at a pulp mill.

Learning Objectives

  • Identify the general reaction for generating chlorine dioxide
  • Identify and differentiate the different chlorine dioxide generation processes
  • Identify and describe the chemicals used for chlorine dioxide generation
  • Identify and describe the safety hazards associated with the chemicals used for chlorine dioxide generation
  • Recognize the by-products of chlorine dioxide generation
  • List the advantages of the current R8 process
  • Identify and describe the equipment used in the R8 process
  • State the conditions that can cause chlorine dioxide decomposition
  • Describe safety hazards and safety guidelines for chlorine dioxide and chlorine dioxide generator operation

Key Questions

The following key questions are answered in this module:

Why is chlorine dioxide generated on-site?
Chlorine dioxide gas is very unstable, so it cannot be transported in high concentrations. It is stored at about 1% on-site.

How is chlorine dioxide gas created?
Chlorine dioxide gas is created by the reduction of sodium chlorate in a strong acid solution.

What is the main chlorine dioxide generation process in use today?
The two main processes are called R8 and SVP-LITE. They both operate under vacuum conditions and use methanol as a reducing agent.

What are the main pieces of equipment for chlorine dioxide generation?
There are several pieces of equipment in the R8/SVP-LITE process: a circulation pump, generator, reboiler, salt cake filter, condenser, absorption tower, and a vent gas scrubber.

What is a puff?
A puff is an explosion that occurs when chlorine dioxide gas decomposes. The severity is proportional to the concentration of chlorine dioxide gas in air.

Sample Video Transcript

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

The reaction in the generator forms sodium sesquisulfate crystals. These crystals are pumped from the bottom of the generator to a rotary drum filter to remove water. Water is used on the filter to remove and recover reaction chemicals. The filtrate is returned to the generator, and sodium sulfate crystals are dissolved in hot water. The salt cake can then be used in the pulp mill recovery system. The R8 and SVP-Lite processes produce 40% less salt cake than the R3 and SVP processes.
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