3IETHOD OF maxufactitj:. 509 



Oak Sin Rejining Company, EdicardsviUe, Madison County, HI. 



1. The juice from the mill passes through a long perforated screen 

 for removing mechanical impurities, to the sulphur box, where it is 

 treated with sulphurous acid from the burning of sulphur, the sulphur- 

 ous acid passing over a water-trough 8 feet long (to take out any sul- 

 phuric acid) before it reaches the sulphur box and juice. From the 

 sulphur box the juice is received in tanks, in which some sediment 

 falls. 



2. Milk of lime, about 12° Beaume, is added to the juice in the 

 defecators before heating, and not quite to the p^int of neutralization, 

 as showTi by litmus paper. Heat is now applied by means of steam 

 coils at bottom. When the first heavy blanket of scum is obtained, 

 it is skimmed, and then another scum is brought up and removed. 

 The juice is now boiled briskly for a few minutes, and then allowed 

 to settle. The juice should then be quite clear, and is drawn into 

 settling tanks to permit the further deposit of impurities, and then is 

 drawn into evaporators. 



3. The defecated juice is concentrated in a circidar evaporator with 

 a scum trough, into which the green scum, which at first forms, is swept 

 as fast as it rises. When all the scum has been removed, the boil- 

 ing is urged, with high steam (80 pounds) pressure, till a semi-syrup 

 of 20° to 25° Beaume is obtained. 



4. The semi-syrup is then drawn into settling tanks, if not quite 

 clear, and is in a second circular evaporator brtjught to 35° or 36° 

 Beaume; but it is desirable to complete the evaporation before the 

 semi-syrup is allowed to cool. The concentrated syrup is cooled as 

 speedily as possible, by allowing it to run over a wide surface exposed 

 to the air before it passes into the storage tanks. 



5. Before liming, good results have been obtained by adding to the 

 cold juice in the defecator a small amount of superphosphate of lime. 



Jefferson Sugar Company, Jeffet-son, Ohio. 



1. Juice from 3 roll mill, heated by steam-pipes to 180° F., and 

 neutralized with milk of lime ; then heated to boiling, skimmed, al- 

 lowed to settle, and the clear liquor drawn off into a settling tank, 

 where it is made acid with a solution of sulphurous acid or with the 



2. Evaporated to semi-syrup with skimming, in open galvanized 

 iron pan, heated by steam, and the semi-syrup finished in a separate 

 pan heated with steam. 



