Chlorine dioxide is widely used in the bleaching of kraft pulp. It reacts readily with lignin and does not significantly react with cellulose fibers, so it produces strong, stable, clean, high-brightness pulps. However, because chlorine dioxide is unstable as a gas and can only be stored in very dilute water-based solutions, it must be generated on-site.
This course covers some early commercial chlorine dioxide generation processes in addition to the processes that are currently in use. It also discusses the conditions that can cause chlorine dioxide to decompose and other safety considerations.