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

Sulfite cooking of viscose cellulose. X. The effect of furfural on the decomposition of the cooking acid

I. Slávik

Slovak Academy of Sciences, Bratislava

Abstract: cf. C.A. 54, 6117e. The effect of furfural (I) was studied on the decompn. of SO₂ on heating up to 150° during 3.5 hrs. in buffered and unbuffered solns. in wood pulp cooking. I accelerates SO₂ decompn. in unbuffered solns. and decomp. itself, forming dark condensation products. In buffered solns. it has little effect. Judging from the ratio of S:H₂SO₄ and the elementary compn. of the dark condensation products, I has an oxidative effect on SO₂ and is effective in the last stage of sulfite cooking causing decompn. of SO₂, even in buffered solns. Since I decomp. at the end of cooking, it cannot accumulate in larger amts. The substance causing the darkening of sulfite liquor may be composed partially of the condensation products of I.

Full paper in Portable Document Format: 1310a621.pdf (in Slovak)

Chemical Papers 13 (10) 621–627 (1959)