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Sulfite cooking of viscose cellulose. III

I. Sl√°vik

Slovak Academy of Sciences, Bratislava

 

Abstract: cf. C.A. 49, 7241h. α-Cellulose, pentosans, and polydispersion of spruce-viscose cellulose cooked in pure acid and in an acid with added org. impurities (I) formed in cooking were studied. The amt. of α-cellulose is not dependent on the viscosity and on the compn. of the cooking acid but it increases with increasing cooking temp. Pentosans are not dependent on temp. and compn. of cooking acid but decrease with decreasing viscosity. Polydispersion (Ekenstam's method, cf. C.A. 36, 6339.4) showed at high viscosity many polymers up to 250 and above 800. I are detrimental only if present at the beginning of cooking. I together with the acid penetrate the chips and cause accelerated decompn. of SO2, increased acidity, and condensation of lignin.

Full paper in Portable Document Format: 92a129.pdf (in Slovak)

 

Chemical Papers 9 (2) 129–147 (1955)

Thursday, June 20, 2024

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