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

Incrustation of black-liquor evaporators in sulfate cellulose plants

V. Kubelka

Forschungsinstitut für Zellulose in Bratislava

Abstract: The cause of incrustations (I) is explained. By increasing temp. the soly. of Na₂SO₄ is decreased because it has a neg. soly. coeff. I are formed by 2Na₂SO₄.Na₂CO₃ which deposits at a temp. higher than 35° from a satd. soln. of Na₂SO₄ and Na₂CO₃. From the chem. compn. of black liquor showing Na₂SO₄, Na₂CO₃, NaOH, Na₂S, Na₂SO₃, and Na₂S₂O₃ the formation of I can be gaged to prevent I, the limit at 100° is 7-8% Na₂SO₄ based on the dry matter of liquor, but in practice 6% Na₂SO₄ is recommended as a max. concn.

Full paper in Portable Document Format: 86a385.pdf (in Slovak)

Chemical Papers 8 (6) 385–397 (1954)