Description
This course begins with an overview of the three basic pulping technologies?mechanical pulping, sulfite pulping, and kraft pulping. Because of the increased use of recycled fiber as a fiber source, secondary fiber technology is also reviewed. Kraft pulping is the predominant industry pulping process, so major emphasis is given to this technology. The supporting chemical and mechanical principles for the pulping processes are detailed. These include the chemistry of kraft and sulfite liquors, the chemistry of black liquor recovery, recovery boiler operation, steam properties related to steam generation in recovery systems, recausticising, calcination, bleaching sequences, bleaching chemicals, and overall pulp mill recovery systems as associated with environmental concerns. The mechanical and chemical bases are provided for the mechanical pulping and secondary fiber pulping processes. The properties and testing of pulps will be discussed. Prerequisite: PPT111; Co-requisite: CHE101 or CHE