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. I

I. Slávik

Slovak Academy of Sciences, Bratislava

Abstract: Many points in sulfite pulping in the formation of cellulose, for viscose manuf., require further study. The speed of impregnation is not affected greatly by the acid, but is increased with increasing amts. of SO₂ and to a lesser degree with decreasing amts. of CaO in the cooking liquor. The relative speed of sulfonation at 40, 60, 80, 100, and 120° is 1:7.5:12:24:60. Increasing the amt. of SO₂ and decreasing that of CaO in the acid accelerate sulfonation. Soln. of woody matter is appreciable at 60°. The speed is practically doubled by increasing temp. from 100 to 120°. By increasing amt. of liquor and SO₂ and decreasing CaO, the speed of soln. is increased. Polysaccharides and lignin dissolve differently depending on the source of wood and compn. of the cooking liquor.

Full paper in Portable Document Format: 86a367.pdf (in Slovak)

Chemical Papers 8 (6) 367–384 (1954)