Archive image from page 257 of Dairy chemistry; a practical handbook. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies dairychemistryp00rich Year: 1920 242 THE ANALYSIS OF BUTTER FAT. supposed, attempted to estimate this by distillation, but finally relinquished the method on account of discordant results, due largely to the bumping of the liquid and the use of too strong an acid. Reichert proposed saponifying 25 grammes of butter with caustic soda and alcohol, evaporating off the alcohol, adding 50 of water and 20 dilute sulphuric acid,
Archive image from page 257 of Dairy chemistry; a practical handbook. Dairy chemistry; a practical handbook for dairy chemists and others having control of dairies dairychemistryp00rich Year: 1920 242 THE ANALYSIS OF BUTTER FAT. supposed, attempted to estimate this by distillation, but finally relinquished the method on account of discordant results, due largely to the bumping of the liquid and the use of too strong an acid. Reichert proposed saponifying 25 grammes of butter with caustic soda and alcohol, evaporating off the alcohol, adding 50 of water and 20 dilute sulphuric acid, and distilling 50 in a weak current of air. This method, though Reichert himself calls it Hehner's method, is now known as the Reichert process. He showed that butters took a constant amount of deci-normal alkali for neutralisation, while fats and artificial butters took very small quantities (0-3 ), and coconut oil took about 3 ; he proposed 14-0 as the mean for genuine butters, Fig. 31.—Reichert-Wollny Apparatus. and 13-0 as a limit; he showed also that mixtures of butter N and margarine took quantities of — alkali equivalent to the amount of butter they contained. Meissl proposed saponifying 5 grammes of butter fat in a flask of about 200 capacity with 2 grammes of caustic potash and 50 of 70 per cent, alcohol, and driving off the alcohol on the water-bath. The resulting soap is dissolved in 100 of water, and 40 of dilute sulphuric acid (1 to 10) are added and the solution distilled with a few small pieces of pumice ; 110 are collected, filtered, and 100 titrated with deci- normal alkali. In common with Reichert and the earlier experi- menters, he used litmus as an indicator, but the superiority of
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