@article{oai:toyama.repo.nii.ac.jp:00004252,
 author = {坂井, 徹 and 大井, 信一},
 journal = {富山大学工学部紀要},
 month = {Mar},
 note = {The liquid-phase oxidation of sodium sulfide catalyzed by various materials such as 4 sulfur dyes, 6 vat dyes, CuSO_4, MnSO_4, CoSO_4, FeSO_4, pyrocatechol, and sulfate lignin have been studied, and catalyst activity and selectivity for this oxidation of the employed catalysts have been investigated.
Measurement of time-course of concentration of liquid compounds was carried out with a stirred vessel under aeration, while that of a absorption rate of oxygen was performed in a batchwise operation.
Oxidation products were Na_2S_2, Na_2SO_3, and mainly Na_2S_20_3. At first, Na_2S_2, Na_2SO_3 and Na_2S_20_3 were formed by oxidation of Na_2S simultaneously, and Na_2S_20_3 was also formed by the reaction of Na_2S_2 with Na_2S0_3 subsequently.
In general, catalyst activity of sulfur dyes was higher than that of vat dyes, and that of metal sulfates such as MnSO_4, CuSO_4, and CoSO_4 was particularly high. Metal sulfates had a high selectivity for the formation of Na_2S_20_3.
A presumption of reaction mechanism was somewhat described., Article, 富山大学工学部紀要，31},
 pages = {28--32},
 title = {Catalyst Activity and Selectivity for Liquid-Phase Oxidation of Sodium Sulfide catalyzed by Various Materials},
 volume = {31},
 year = {1980}
}