Process of making cellulose pulp with a sulphite cooking liquor containing sulphide and a quinone or hydroquinone compound
AssigneeSvenska Traforskningsinstitutet
InventorsAnts Teder, Leelo Olm, Jan-Erik Wilken
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Abstract
A process of manufacturing cellulose pulp from wood by digesting the wood with sulphite cooking liquor containing additions of sulphide and in the presence of a quinone or hydroquinone compound. According to the invention, the mole ratio between sulphide and sulphite shall amount to 0.01-0.2, preferably 0.05.0.15, suitably 0.08-0.12.
Claims12
A process for the manufacture of pulp from wood comprising digesting an amount of wood with a sulphite cooking liquor containing sulphide and a quinone or hydroquinone compound, the mole ratio between sulphide and sulphite, calculated as Na.sub.2 S and, respectively, Na.sub.2 SO.sub.3, amounting to 0.05-0.2.
Dependencies are inferred from the claim text.