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- Chemical pulping consists of treating wood chips with specific chemicals in order to break the internal lignin and lignin-carbohydrate linkages and liberate pulp fibers. Chemical pulping not only liberates individual wood fibers, but also removes most of the lignin from the pulp and “flexibilizes” the fibers.
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The four principal processes used in chemical pulping are kraft, sulfite, neutral sulfite semi-chemical (NSSC), and soda. The first three have great potential for causing air pollution. The kraft process alone accounts for over 80% of the chemical pulp produced in the USA.
- Mechanical Pulp
Mechanical pulping destroys more of the wood fibers than...
- Chemical Pulping
The main aim in chemical pulping is to separate the wood...
- Pulping Process
Chemical pulp processing can be further divided into two...
- Mechanical Pulp
The main aim in chemical pulping is to separate the wood fibers from each other to render them suitable for further industrial processing. Delignification of woody material is carried out by two major types of processes: the sulfate (kraft) and the sulfite process.
Chemical pulping is the most common type of refining process, extracting fibers from wood by cooking the material in a chemical solution and increasing pressure. This type of processing yields a high-quality pulp (40-55% yield) but produces lower-quality paper (office paper).
Chemical pulp processing can be further divided into two main categories, namely alkaline Kraft pulping and acidic or near-neutral sulphite processes. The main aim of chemical pulping is to separate lignin and hemicellulose from the cellulose fibres, leaving the latter mostly in polymerised form.
Chemical pulping is a process of breaking down the lignin and separating the fibers from wood to produce pulp for papermaking. There are two main types of chemical pulping processes: kraft and sulfite.
A method of converting wood chips into paper pulp for use in papermaking accomplished by chemical cooking of the chips, as opposed to mechanical pulping. The purpose of pulping is to reduce wood (or other fibrous raw material) to individual cellulose fibers.
The kraft pulping process is one of the most important chemical pulping methods used in the paper industry. It was invented by Carl F. Dahl in the 1870s and has since become the dominant method for producing pulp from wood chips or other lignocellulosic materials.
