| Popis: |
A number of tests applicable to crude glycerine have been studied to find a means of detecting crude glycerines which will cause more difficulty in the refinery or yield a poorer product than would be expected from the results of analyses customarily made. Five tests have been found which are believed to be useful in this way. They are determination of pH, determination of nitrogen, distillation, measurement of the color of the distillate, and measurement of distillate color of stability when heated. |
Full text from SpringerLink