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

Sulfite cooking of viscose cellulose. XII. The dependence of the cooking acid on the temperature

I. Slávik

Slovak Academy of Sciences, Bratislava

Abstract: cf. CA 54, 18954e. The speeds of the decompn. of SO₂ solns. with the addn. of glucose, HCO₂H, furfural, S, and thiosulfates in buffered and unbuffered solns. at 110, 125, 140, and 150° for 2 hrs. in sealed tubes were studied. Glucose and furfural at 110 and 125° do not accelerate the decompn. appreciably and relatively little at higher temps. HCO₂H and thiosulfates are strongly active even at the lowest temp., more in the buffered than in the unbuffered soln. S shows an activity similar to that of the thiosulfates (although weaker). Apparently a relatively smaller surface area is presented by S, which in the buffered solns. is converted slowly into sol. thiosulfates. In sulfite digestions HCO₂H and thiosulfates are very detrimental because they accelerate the decompn. of SO₂ even in the initial phase of cooking at low temp. Glucose is slightly and furfural the least harmful.

Full paper in Portable Document Format: 143a215.pdf (in Slovak)

Chemical Papers 14 (3) 215–224 (1960)