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

Sulfite cooking for viscose type pulp. XI. Effect of time on the decomposition of cooking acid with the addition of glucose

I. Slávik

Slovak Academy of Sciences, Bratislava

Abstract: cf. CA 54, 7141f. The effect of time on the decompn. of SO₂ solns. with the addn. of glucose at 150° in unbuffered and buffered solns. was studied. The unbuffered soln. contg. 2.4% SO₂ showed an induction period of 1 to 2 hrs., the buffered soln. with 0.8% NaOH, contg. 3.04% SO₂ or 1.8% SO₂ showed an induction period of 2 to 3 hrs. and 5.5 hrs., resp. In both unbuffered and buffered solns. contg. higher amts. of total SO₂, a considerable autocatalytic acceleration of the decompn. was reached very rapidly, and resulted in a decrease of SO₂, and the formation of appreciable amts. of H₂SO₄, thiosulfates, and elementary S. In a buffered soln. with a lower SO₂no such acceleration was observed. The amts. of thiosulfates in buffered solns. were much higher than in unbuffered solns. The usual time required to complete digestion for a viscose-type pulp is sufficient to cause accelerated decompn. of the cooking acid.

Full paper in Portable Document Format: 142a129.pdf (in Slovak)

Chemical Papers 14 (2) 129–136 (1960)