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Nov 20, 2023 · Compared with mechanical pulping, the chemical pulping process uses chemicals to destroy the surface of pulping raw materials at a certain temperature and pressure, penetrating the interior and destroying lignin and some nonfibrous carbohydrates as well as pectin substances . The most commonly used chemical methods are the sulfate and sulfite ...
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.
Paper pulp can be classified mainly into two types by the pulping methods: chemical pulp and mechanical pulp. The chemical pulp is produced through the chemical pulping process, while the mechanical pulp is produced through mechanical pulping.
Nov 20, 2023 · Compared to pure chemical pulping, pretreatment with biological enzymes effectively improves pulp properties in straw pulping. Biological pulping reduces chemical components by 12%, increases residual alkali, and attains optical and chemical properties similar to purely chemically treated pulp.
Most chemical pulp is made by the sulphate (or Kraft) process, in which caustic soda and sodium sulphate ‘cook' the woodchips. In the unbleached stage, a dark brown but very strong pulp results and this
Chemical wood pulp is made by cooking wood chips with chemical solutions in digesters operated at elevated temperature and pressure. The chemicals used are (1) sulfite salts with an excess of sulfur dioxide and (2) caustic soda and sodium sulfide (the kraft process). The lignin of the wood is made soluble, and the fibres separate as whole fibres.
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Nov 29, 2004 · The pulping industry has been traditionally using mechanical or chemical pulping methods, or a combination of the two, to produce pulps of desired characteristics. Mechanical pulping accounts for about 25% of the wood pulp production in the world today.
