Elimination of the calcium cycle: direct electrolytic causticizing of Kraft smelt. Final report

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An electrochemical molten salt alternative to the classic Kraft causticizing process has been investigated and the feasibility of the process was successfully shown. The experiments include (A) the determination of background thermal decomposition gases, (B) the electrolysis of a sodium carbonate only smelt to show that sodium oxide can be electrochemically produced, and (C) electrolysis of a synthetic smelt containing 80 mole % Na{sub 2}CO{sub 3} and 20 mole % Na{sub 2}S. The experiments show, that sodium hydroxide (NaOH) was produced by the electrochemical reduction of sodium carbonate to sodium oxide in the molten state. In the experiment containing sodium ... continued below

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40 p.

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Pfromm, P. & Winnick, J. January 19, 1999.

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Description

An electrochemical molten salt alternative to the classic Kraft causticizing process has been investigated and the feasibility of the process was successfully shown. The experiments include (A) the determination of background thermal decomposition gases, (B) the electrolysis of a sodium carbonate only smelt to show that sodium oxide can be electrochemically produced, and (C) electrolysis of a synthetic smelt containing 80 mole % Na{sub 2}CO{sub 3} and 20 mole % Na{sub 2}S. The experiments show, that sodium hydroxide (NaOH) was produced by the electrochemical reduction of sodium carbonate to sodium oxide in the molten state. In the experiment containing sodium sulfide, there was formation of less than 5 mole % of polysulfide. Energy savings on the order of 500,000 BTU per ton of kraft pulp produced are estimated, based on the energy used by the mill. Operating costs are estimated to be currently similar to conventional processing. However, price increases of fossil fuels and increased co-generation of electricity in the mill will give the electrolytical process significant cost advantages.

Physical Description

40 p.

Notes

OSTI as DE00006634

Medium: P; Size: 40 pages

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  • Other Information: PBD: 19 Jan 1999

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  • Report No.: None
  • Grant Number: FC07-97ID13547
  • DOI: 10.2172/6634 | External Link
  • Office of Scientific & Technical Information Report Number: 6634
  • Archival Resource Key: ark:/67531/metadc703837

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 19, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:47 p.m.

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Pfromm, P. & Winnick, J. Elimination of the calcium cycle: direct electrolytic causticizing of Kraft smelt. Final report, report, January 19, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc703837/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.