. Journal. the principle of awater-bath which is heated by steam. This plant is calculated for an output of 36 kilos, offluorescein per day.—C. 0. W. The Manufacture oj Eosin soluble in Alcohol (Ethyleosin)Otto Miillhiiuser. Dingl. Polyt. J. 283, 1892,210. In a former paper (Dingl. Polyt. J. 263, 49 and 99; thisJournal, 1887, p. 283) for the manufacture of tetrabromo-ethyl-fluorescein, which is the eosin soluble in alcohol ofcommerce, the bromination aud etherification are performedin one operation by the treatment ot a hot solution offluorescein in alcohol with bromine. The apparatus employed


. Journal. the principle of awater-bath which is heated by steam. This plant is calculated for an output of 36 kilos, offluorescein per day.—C. 0. W. The Manufacture oj Eosin soluble in Alcohol (Ethyleosin)Otto Miillhiiuser. Dingl. Polyt. J. 283, 1892,210. In a former paper (Dingl. Polyt. J. 263, 49 and 99; thisJournal, 1887, p. 283) for the manufacture of tetrabromo-ethyl-fluorescein, which is the eosin soluble in alcohol ofcommerce, the bromination aud etherification are performedin one operation by the treatment ot a hot solution offluorescein in alcohol with bromine. The apparatus employedfor the process is represented in Figs. 1 and 2, and consistsessentially of a steam-jacketed pan A and a condenser inside of the pan A (Fig. 2) and also the agitator aare enamelled, and the lid of the pan is provided with theconnections b aud c, manhole, the stuffing-box e for theagitator, and a gauge-glass. On the bottom of the steam-jacket A an outlet i for the waste steam is provided. The Fig. 676 THE JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY. [Aug. 31, ism: lead coil of the condenser B is connected with pan A bymeans of the copper elbow k and the brass tap /. On thetop of the condenser the glass bottle D, provided with aglass tap, is so arranged that the bromine contained in thebottle can be introduced iuto the pan A through the glasstube m and the brass tap n. Beneath the overflow of thelead coil the jug E is placed. In working with this plant, the pan A (Figs. 1 and 2) isfirst charged with the required quantity of alcohol; then theagitator is started, and the fluorescein added through themanhole, which is then closed. As soon as the alcohol isboiling, the bromine contained in the glass bottle D is added,when a violent reaction takes place. Should any liquid beejected from the end of the coil, it will be caught in the jugshown in Fig. 2. As soon as all the bromine has been added,the taps / and n are closed, and the mass heated for sometime under a pressure of


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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882