sulfite process

noun Chemistry.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica

sulfite process

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Used in the sulfite process for the manufacture of wood pulp.
The sulfite process utilizes a cooking liquor containing sulfur dioxide,
  sulfurous acid, and bisulfite.
During that time, it used an acid sulfite process to produce dissolving-grade
  cellulose pulps for a specialty-chemical market.
The mill used an ammonia-based acid sulfite process to produce dissolving-grade
  pulps for a specialty pulp market.
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