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

The determination of lignosulfonic acids in sulfite liquors

K. Kűrschner

Slovak Academy of Sciences, Bratislava

Abstract: The method is based on the detn. of MeOH formed from compds. contg. MeO groups, and, by multiplying it by 7.9, the amt. of Ca lignosulfonate is obtained (K. and Schweizpacher, C.A. 49, 12828i). Sulfite liquor is dild. to 10 times its original vol., 5 ml. is evapd. on a boiling water bath, and the dry matter is boiled 1 min. with 82% H₂SO₄. Then org. acids, SO₂, CO₂, CO, and MeOH, are distd. off, the distillate is made alk. and boiled with a few drops AgNO₃, the MeOH is distd. off and detd. by oxidation with KMnO₄ in alk. soln. Also in J. Appl. Chem. U.S.S.R. 28, 595-9(1955).

Full paper in Portable Document Format: 92a99.pdf (in Slovak)

Chemical Papers 9 (2) 99–108 (1955)