ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Sulfite cooking of pulps for viscose manufacture. II. Low content of lime and condensation of lignin

I. Slávik

Slovak Academy of Sciences, Bratislava

Abstract: The effect of low concn. (0.5-0.6%) CaO on the condensation of lignin (I) in sulfite cooking of viscose cellulose from pine-wood was studied. Decreased amts. of CaO and lignosulfonic acid have no effect on I; HCO₂H and reducing sugars (II) increase I while AcOH decreases I. The detrimental effect of HCO₂H is shown if added at the end of cooking at 150° and at concns. of SO₂ above 0.4%. If II are present in the initial cooking stages the detrimental effect is pronounced, especially in forming dissolving pulp at 140-145°.

Full paper in Portable Document Format: 87a438.pdf (in Slovak)

Chemical Papers 8 (7) 438–451 (1954)