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Difference between revisions of "Pulping and fractionation"
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Pulping is performed on feedstock with a high fibre content. Before the pulping process, any material that is low in fibrous material should be removed. For example, wood undergoes debarking before the pulping process. Next, the biomass should be [[Sizing|sized]], for example by [[Sizing#Chipping|chipping]].<ref name=":0" /> The most common feedstock for pulping is woody biomass. Examples of non-woody biomass are sisal, rice straw, cotton linen, sugarcane bagasse, pineapple, and straw.<ref name=":1" /> | Pulping is performed on feedstock with a high fibre content. Before the pulping process, any material that is low in fibrous material should be removed. For example, wood undergoes debarking before the pulping process. Next, the biomass should be [[Sizing|sized]], for example by [[Sizing#Chipping|chipping]].<ref name=":0" /> The most common feedstock for pulping is woody biomass. Examples of non-woody biomass are sisal, rice straw, cotton linen, sugarcane bagasse, pineapple, and straw.<ref name=":1" /> | ||
===Pre-treatment=== | ===Pre-treatment=== | ||
The used biomass for pulping and fractionation process is often woody biomass. This feedstock first needs to be debarked and then [[Sizing#chipping|chipped]]. | |||
==Process and technologies== | ==Process and technologies== | ||
===Chemical pulping=== | ===Chemical pulping=== | ||
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The resulting product of the pulping process, called pulp, can be further processed into many paper and board products. Depending on the qualities of the pulp, different products are made. Mechanical pulps, which are low quality pulps, are suitable for low-quality paper, such as newspaper, catalogues, paper towels, tissues, and sanitary papers. High quality pulps from chemical pulping are used for printing and writing paper. Finally, the hybrid pulping processes give pulps with stiff fibres and are commonly used in corrugated board, roll cores, and containers.<ref name=":0" /> | The resulting product of the pulping process, called pulp, can be further processed into many paper and board products. Depending on the qualities of the pulp, different products are made. Mechanical pulps, which are low quality pulps, are suitable for low-quality paper, such as newspaper, catalogues, paper towels, tissues, and sanitary papers. High quality pulps from chemical pulping are used for printing and writing paper. Finally, the hybrid pulping processes give pulps with stiff fibres and are commonly used in corrugated board, roll cores, and containers.<ref name=":0" /> | ||
The resulting products from fractionation processes | The resulting products from fractionation processes include also lignin or lignin derivatives. | ||
===Post-treatment=== | ===Post-treatment=== | ||
After the pulping process, a paper-making process follows, which converts the pulp to paper and cardboard products. | |||
In the case of a fractionation lignin products are formed as well. Depending on the application, lignin can be used as is, or chemically treated, for example by a sulfonation reaction. | |||
==Technology providers== | ==Technology providers== | ||
{| class="wikitable sortable mw-collapsible mw-collapsed" | {| class="wikitable sortable mw-collapsible mw-collapsed" | ||