摘要: An electrochemical molten salt alternative to the classic Kraft causticizing211process has been investigated and the feasibility of the process was successfully 211shown. The experiments include (A) the determination of backgrou... 展开 An electrochemical molten salt alternative to the classic Kraft causticizing211process has been investigated and the feasibility of the process was successfully 211shown. The experiments include (A) the determination of background thermal 211decomposition gases, (B) the electrolysis of a sodium carbonate only smelt to 211show that sodium oxide can be electrochemically produced, and (C) electrolysis of 211a synthetic smelt containing 80 mole % Na(sub 2)CO(sub 3) and 20 mole % Na(sub 2112)S. The experiments show, that sodium hydroxide (NaOH) was produced by the 211electrochemical reduction of sodium carbonate to sodium oxide in the molten 211state. In the experiment containing sodium sulfide, there was formation of less 211than 5 mole % of polysulfide. Energy savings on the order of 500,000 BTU per ton 211of kraft pulp produced are estimated, based on the energy used by the mill. 211Operating costs are estimated to be currently similar to conventional processing. 211However, price increases of fossil fuels and increased co-generation of 211electricity in the mill will give the electrolytical process significant cost 211advantages. 收起