PROCESS FOR PRODUCING A PULP FROM CELLULOSE-CONTAINING MATERIAL, THE PULP ITSELF AND ITS USE

摘要

The invention concerns a method of producing a pulp of cellulosic material,wherein the material is mixed with formic acid as solvent, boiled atapproximately the boiling temperature of the solvent and reflux cooled. Annualplants and wood of deciduous or coniferous trees are used as cellulose-containing material. In a variant method, the cellulosic material is onlyreflux cooled slightly and then a precise predetermined amount of hydrogenperoxide is added as a constant dosage, slowly and substantially without theaddition of further external energy. This variant method can be repeatedwhilst reducing the pulping temperature. The resultant pulp is preferably usedto produce cellulose, in particular for paper or card production. According tothe invention, the lignin dissolved out of the cellulosic material is also re-used and isolated by precipitation in water when the pulp has been separatedfrom the solvent. The resultant lignin can be used as a new building material,a filler or a starter material for producing aromatic substances.