The control of fractional distillation by means of refractive index measurements

✍ Scribed by Raw, R.

• Publisher: Wiley (John Wiley & Sons)
• Year: 1947
• Weight: 397 KB
• Volume: 66
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000661213

✦ Synopsis

MnO, produced Erom the MnSO, proved e f f d v e in alkaline solution. MnSO, was ineffective in acid solution. None of the other substances gave any evidence of assisting oxidation either in acid or alkaline solution.

Series 111. Amorint of uatalyst.-Various amounts ofMnS0, were used and the times for reaching equilibrium compared.

T o '50 ml. hl/Io Cr,(S04), were added 30 ml. 5~-sodium hydroxide and 20 ml. distilled water and the following amounts of ioyo MnSO, solution: 2 ml., I ml.,o.ag ml., 0 . xoml. 0.05 ml.

ando.01 ml. There waslittle differencein oxidationrate between I ml. and 2 ml. but with quantities ofcatalyst less than this amount the rate of oxidation decreased rapidly. Also the 2 ml. were added in lots o f f ml. at intervals of one half hour. Table I1 indicates that I ml. of catalyst was the optimum. Figures are the mean of several oxidations and showed much variation. TABLE I1 Amount of camalyst Time for equilibrium : & Oxidation to I . 2 ml. in 4 lots 0.5 ml. at b hour intervals 5. 0 . 1 ml. Indefinite ro%-20%

disposal.