The calculation for C massecuite dropping purity | Online Calculator
Here two types of examples given for C massecuite dropping purity calculation. One is for grain and massecuite prepared in a batch pan and example another is for grain prepared in batch pan and massecuite prepared in continuous vacuum pan(CVP). An online calculation sheet was also provided.
Example No.1 :
Grain prepared in a 60T batch pan after that 50% material was cut to a vacuum crystalizer then further filled and dropped as a C m/c.
Calculate C massecuite dropping purity ( Take C grain with AH + BH + CL in 60T batch pan, After it is cutting 50% to vacuum crystalized then further use only BH molasses up to dropping the massecuite).
Step 1 :
First fixed the required footing material purity for grain ( Before adding the slurry) supposed to be take 64
Here AH + CL using as graining material ( AH purity – 70 with 75 brix and CL purity 62 with 75 brix)
Pan Capacity = 60MT.
Graining Volume of given batch pan = 45%.
Pan working volume = 60/1.5 = 40M3 = 400HL.
Graining Volume = 40 x 45 / 100 = 18M3 = 180HL. ( here consider graining volume of batch pan 45%)
Weight of the graining material = Volume x specific gravity = 18 x 1.42 = 25.56MT.
Solids in graining material = 25.56 x Brix(92) /100 = 23.51MT.
| AH | ||||
| 72 | 2 | (64-62) | ||
| Graining Material | ||||
| 64 | ||||
| CL | ||||
| 62 | 8 | (72-64) | ||
| 10 | (8 + 2) | |||
Solids from AH for C grain = (2 /10) x 23.51 = 4.70MT.
Solids from CL for grain material = 23.31 – 4.70 = 18.81MT.
| Material | Solids | Purity | Brix | Weight in MT ( Solids x 100/Brix) | Volume in M3 ( Weight/ Sp. Volume) | Volume in HL |
| AH | 4.7 | 72 | 75 | 6.267 | 4.61 | 46 |
| CL | 18.81 | 62 | 75 | 25.08 | 18.44 | 184 |
Step 2 :
After handing the the grain further fill up with BH molasses ( Brix 75 & purity 51 ).
Solids in C grain at the time of dropping = 60MT x 92 /100 = 55.20MT.
Solids from BH molasses for further filling of C grain =55.20 – 23.51 = 31.69MT
Weight of the BH molasses = 31.69 x100/ 75 = 42.25MT
Volume of the BH molasses = 42.25 /1.36 = 31.06 M3 = 310HL.
Final C Grain Purity = [ (Solids in grain x Pty of grain) + ( solids in BH x Pty of BH) ] / solids in final Cgrain.
= [ (23.51 x 64) + (31.69 x 51)] / 55.20
=56.53.
Step 3 :
Now 50% material transferred to a vacuum crytsallizer and then filled with BH molasses ( Brix 75 & purity 51 ) and dropped as a C massecuite. Consider C m/c dropping brix 99.5.
Solids in C grain after 50% transfer to vacuum crystalizer = 55.20/2 = 27.60.
Solids in C massecuite = 60MT x 99.5 /100 = 59.7.
Solids in BH for C massecuite boiling = 59.70 – 27.60 = 32.10.
Weight of the BH molasses for C m/c = 32.10 x100/ 75 = 42.80MT
Volume of the BH molasses for C m/c = 42.80 /1.36 = 31.47 M3 = 315HL.
Final C massecuite dropping purity = [ (Solids in grain x Pty of grain) + ( solids in BH x Pty of BH) ] / solids in C m/c
= [ (27.60 x 56.53) + (32.10 x 51)] / 59.7 = 53.56.
Example No.2 :
Grain is prepared in a 60 T batch pan then it is sent to a continuous pan with 1 : 3 Grain & molasses ratio.
Required Data for calculation of C grain purity, C masseuite final purity, quantity of grain and molasses requirement for continuous pan. Finally, estimate the vapour requirement for C continuous pan for the given pan capacity.
| Particulars | Brix | purity | Sp. Gr. |
| AH molasses | 75 | 72 | 1.337 |
| BH molasses | 80 | 53 | 1.401 |
| CL | 75 | 63 | 1.337 |
| C grain footing ( Before slurry feed) | 86 | 67 | 1.435 |
| C grain | 88 | ? | 1.435 |
| C grain batch pan capacity | 60 | T | |
| Grain Volume of the batch pan | 45 | % | |
| Grain & molasses ratio | 1 : 3 | ||
| C continuous pan capacity | 20 | T/hr | |
| C massecuite Brix | 100 |
Step 1 :
First fixed the required footing material purity for grain ( Before adding the slurry) and then find the C grain dropping purity.
| CL | 7 (72- 65) | ||
| 63 | Footing material for Grain | ||
| 65 | |||
| AH | |||
| 72 | 2 (65 – 63) | ||
| 9 (7 + 2) |
| Grain material purity( For C grain taken CL & AH as a footing material than further fill up with BH.) | ||||
| S.No | Particulars | Values | UOM | Remarks |
| 1 | Solids in C Grain | 52.8 | MT | 60 x 88 /100 |
| 2 | Volume of the pan | 41.8 | M3 | 52.8 / 1.435 |
| 418 | HL | 41.8 x 10 | ||
| 3 | Graing Volume | 188.15 | HL | 418 x 45% |
| 18.82 | M3 | 188.15 / 10 | ||
| 4 | Weight of the grain material | 27 | MT | 18.82 x 1.435 |
| 5 | Solids in grain material | 23.22 | MT | 27 x 86 /100 |
| 6 | Solids from AH for garin material | 5.2 | MT | 23.22 x 2 / 9 |
| 7 | Solids from CL for garin material | 18.1 | MT | 23.22 – 5.2 |
| 8 | Weight from AH for garin material | 6.88 | MT | 5.2 x 100 / 75 |
| 9 | Weight from CL for garin material | 24.08 | MT | 18.1 x 100 / 75 |
| 10 | Volume from AH for garin material | 5.15 | M3 | 6.88/1.337 |
| 51 | HL | 5.15 x 10 | ||
| 11 | Volume from CL for garin material | 18.01 | M3 | 24.08 / 1.337 |
| 180 | HL | 18.01 x 10 | ||
| 12 | Solids from BH to further fill the grain material | 29.58 | MT | 52.8 – 23.22 |
| 13 | Weight from BH to further filling of the grain material | 36.975 | MT | 29.58 x 80 /100 |
| 14 | Volume from BH to the further filling of the grain material | 26.392 | M3 | 36.975 / 1.401 |
| 264 | HL | 26.39 x 10 | ||
| 15 | Final C grain drooping purity | 59.2 | [ (29.58 x 53) + (23.22 x 67)] / 52.8 | |
Step 2 :
| C grain and BH molasses required for C Continuous pan for given grain and molasses ratio and C massecuite final dropping Purity | ||||
| 1 | Grain Quantity | 60 | MT | |
| 2 | BH molasses quantity | 180 | MT | 60 x 3 |
| 3 | C grain solids for C m/c | 52.80 | MT | 60 x 88/ 100 |
| 4 | BH solids for C m/c | 144 | MT | 180 x 80 /100 |
| 5 | C m/c Production for given C grain Qty | 196.80 | T | 52.80+144 |
| Solids | 196.80 | T | 196.80 x 100 /100 | |
| 6 | Grain feed Qty for Cont. Pan | 6.10 | MT/hr | 60 x 20 /196.80 |
| 4.25 | HL/hr | 6.10 / 1.435 | ||
| 7 | BH Molasses feed Qty for Cont. Pan | 18.29 | MT/hr | 6.10 x 3 |
| 131 | HL/hr | 18.29 / 1.401 | ||
| 8 | C m/c Final purity | 54.65 | % | |
Step 3 :
| Steam Flow requirement for Continuous pan | ||||
| 1 | Evaporation rate in BH | 20.00 | % | (100-80)/100 |
| 2 | Evaporation rate in C grain | 12.00 | % | (100-88)/100 |
| 4.39 | T/hr | [(6.10 x 12%) + (18.29 x 20%)] | ||
| Consider 20% extra | 5.27 | T/hr | 4.39 x 1.2 | |
| Steam Flow requirement for Cont. pan | 5.27 | T/hr | ||
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