24 



Sirups. 



The sirup was divided into two equal portions, A aiid B. A was worked by the or- 

 dinary and B by the alcohol process. 



The analyses of the sirups before and after treatment are given in parallel columns 

 in the table below : 



Analyses of sirup from Blade African cane before and after alcoholic treatment. 



In the above experiment the sirup shows a material increase in purity. The re- 

 duction of the density of the sirup is very noticeable. This is due to the condensa- 

 tion of the steam used in the distillation. 



In the first experiments, with the still, a coil was used in boiling the spent liquor in 

 the kettle and thus producing the steam requisite in freeing the sirup from alcohol. 

 This is the method employed in certain distilleries, where it is desirable to produce a 

 mash without dilution. Experiment soon demonstrated that the long detention of 

 this sirup in the kettle at a high temperature was very objectionable. To avoid using 

 the coil a pipe was arranged for delivering a jet of steam above the sirup in the ket- 

 tle and thus remove the alcohol from the descending liqu or. The dilution of the sirup 

 is due to the condensation of this steam. In order to further reduce the length of 

 time required for the separation of the alcohol, the flow of cold water was entirely 

 cut off from the goose tub and low-strength alcohol only was produced. This alco- 

 hol was about 160 per cent proof, and was afterwards redistilled to obtain the neces- 

 sary strength. 



Yield. 



(A) The sirup by the ordinary process yielded 2,512 pounds of first massecuite, from 

 which 1,175 pounds of sugar of 85.5 polarization were obtained. The yield of sugar 

 per cent massecuite was 46.8. Owing to difficulty in granulation this sugar was 

 boiled to string proof and was left in the hot room several days. 



(B) The sirup treated by the alcohol process yielded 2,181 pounds of first masse- 

 cuite and 1,196 pounds of sugar of 92.3 polarization. This sugar was dried in the 

 centrifugal immediately after leaving the vacuum pan. The yield of sugar per cent 

 massecuite was 54.8. 



Through an oversight the weight of filter-press cake in Experiment No. 2 was not 

 recorded. 



Bfoume' of yield. 



BLACK AFRICAN CANE. 



* Corrected for samples and skimmings, t Note difference in polarization of the sugars. 



