SUGAR BOILING AND CRYSTALLIZATION-IN-MOTION 395 



45 purity molasses. A portion of this 75 purity massecuite is left in the pan 

 as a footing for the 55 purity low-grade massecuite. The proportions of 

 75 purit}^ massecuite and 45 purity molasses to give a 55 purity massecuite 

 can be obtained as in equation (i) above, remembering always that the quan- 

 tities found refer to the actual quantities of gravity solids in the materials. 

 With the purities selected as a base, 0-333 o^ the strike will consist of the 

 footing of 75 purity massecuite. 



vSince, moreover, for each purity in the syrup it is known how much low- 

 grade massecuite is produced, the quantity of footing required is also known. 



For the case of 80 purit}^ it has already been computed that 1-167 

 parts of 75 purity massecuite are produced, and 0-405 part of 55 purity 

 massecuite. This last consists of 33-3 per cent, of 75 purity massecuite, 

 or 0*333 X 0'405 = 0*i35 part of the 75 purit}^ massecuite remains in the 

 pan, and is not dried as high-grade massecuite. The quantity of 75 purity 

 massecuite to be handled is then 1-167 — 0-135 = 1-032 part per part of 

 gravity solids in the syrup. 



Further, the sugar produced from the low-purity massecuite is re-dried 

 along with the high purit}^ massecuite, so that as regards the high-grade 

 centrifugals allowance must be made for this. Taking this as 40 per cent, 

 of the massecuite in the selected case, there will be produced o - 405 x o • 40 

 = 0-162, so that the total quantity of massecuite dried in the high-grade 

 centrifugals is 1-032 -f- 0-162 — 1-195 part. 



In the annexed tables are given the results of similar calculations for 

 purities 75 to 90, and for the three-massecuite system for purities 80 to 90. 



Quantity of Mas3p;cuite produced in a Two-Massecuite Process. 



