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Dissolving pulp is mainly produced chemically from pulpwood in a process that has a low yield (30 - 35% of the wood). This makes up of about 85 - 88% of the production. [2] Dissolving pulp is made from the sulfite process or the kraft process with an acid prehydrolysis step to remove hemicelluloses. For the highest quality, it should be derived ...
A special grade of bleached sulfite pulp is known as dissolving pulp [12] which is the raw material for a wide variety of cellulose derivatives, for example rayon, cellophane, cellulose acetate and methylcellulose. Rayon is a reconstituted cellulose fiber used to make many fabrics.
Chemical pulping involves dissolving lignin in order to extract the cellulose from the wood fiber. The different processes of chemical pulping include the Kraft process, which uses caustic soda and sodium sulfide and is the most common; alternatively, the use of sulfurous acid is known as the sulfite process, the neutral sulfite semichemical is treated as a third process separate from sulfite ...
Speciality pulp grades have many other applications. Dissolving pulp is used in making regenerated cellulose that is used textile and cellophane production. It is also used to make cellulose derivatives. Fluff pulp is used in diapers, feminine hygiene products and nonwovens.
A pulp mill is a manufacturing facility that converts wood chips or other plant fiber ... A special grade of bleached sulfite pulp, known as dissolving pulp, ...
The pulp has the consistency of thick posterboard paper and is delivered in rolls weighing some 500 lb (230 kg). N -Methylmorpholine N -oxide is a key solvent in the Lyocell process At the Lyocell mill, rolls of pulp are broken into one-inch squares and dissolved in N -methylmorpholine N -oxide (NMMO [ 2 ] ), giving a solution called "dope".
Its main products were traditionally pulp and paper. The company later started producing chemicals based on timber as a raw material. After a takeover in 1986, Borregaard was part of the chemical division of the Orkla Group until it was spun off and introduced to the Oslo Stock Exchange in October 2012. It had 1050 employees in 2016.
Acetate is derived from cellulose by initially deconstructing wood pulp into a purified fluffy white cellulose. To manufacture a good product, special qualities of pulps, such as dissolving pulps, are used. The uneven reactivity of cellulose presents a common problem affecting the quality of the cellulose acetate product.