sulfite process

a process for making wood pulp by digesting wood chips in an acid liquor consisting of sulfurous acid and a salt, usually calcium bisulfite.
[1900-05]

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▪ wood industry
sulfite also spelled  Sulphite,  

      chemical process for the manufacture of paper pulp that employs an acid bisulfite solution to soften the wood material by removing the lignin from the cellulose. Sulfite cooking liquor used in the process consists of free sulfur dioxide obtained by the burning of sulfur or by the roasting of iron pyrites, dissolved in water at a concentration of four to eight percent, with from two to three percent in the form of bisulfite. The sulfite digestion of the wood material is normally carried out as a batch process in a pressure vessel that consists of a steel shell possessing an acid-resistant lining. See also kraft process.

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Universalium. 2010.

Look at other dictionaries:

  • Sulfite process — The sulfite process produces wood pulp which is almost pure cellulose fibers by using various salts of sulfurous acid to extract the lignin from wood chips in large pressure vessels called digesters. The salts used in the pulping process are… …   Wikipedia

  • sulfite process — noun : an acid process for making pulp from wood in which chips are cooked at high temperature and pressure in a solution of bisulfite of calcium, magnesium, sodium, or ammonium * * * Chem. a process for making wood pulp by digesting wood chips… …   Useful english dictionary

  • sulfite pulp — noun : wood pulp prepared by the sulfite process sulfite pulps are particularly useful for writing papers because of their … strength J.P.Casey * * * wood pulp made by the sulfite process. [1905 10] …   Useful english dictionary

  • sulfite pulp — wood pulp made by the sulfite process. [1905 10] * * * …   Universalium

  • sulfite liquor — noun : the bisulfite solution used in making pulp by the sulfite process …   Useful english dictionary

  • Kraft process — The Kraft process (also known as Kraft pulping or sulfate process) describes a technology for conversion of wood into wood pulp consisting of almost pure cellulose fibers. The process entails treatment of wood chips with a mixture of sodium… …   Wikipedia

  • kraft process — Chem. See sulfate process. * * * Chemical method for producing wood pulp using caustic soda and sodium sulfide as the liquor in which the pulpwood is cooked to loosen the fibres. The process (from German kraft, strong ) produces particularly… …   Universalium

  • Calcium sulfite —   A white powder, soluble in diluted sulfuric acid. Used in the sulfite process for the manufacture of wood pulp.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

  • Sodium sulfite — anhydrous …   Wikipedia

  • Solvay process — The Solvay process, also referred to as the ammonia soda process, is the major industrial process for the production of soda ash (sodium carbonate). The ammonia soda process was developed into its modern form by Ernest Solvay during the 1860s.… …   Wikipedia

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