Calculation for C massecuite dropping purity | Online Calculator
In this article. provided two types of examples for C massecuite dropping purity calculation. One is for grain and massecuite prepared in batch pan and other one is grain prepared in batch pan and massecuite prepared in continuous vacuum pan(CVP). Also provided Online calculation sheet for the same.
Example No.1 :
Grain prepared in 60T batch pan after that 50% material cut to vacuum crystalizer then further filled and dropped as a C m/c.
Calculate C massecuite dropping purity : We assume C grain prepared with A Heavy + B Heavy + C Light molasses in 60T batch pan, After it was cut 50% to vacuum crystallizer then further feed only BH molasses upto dropping of massecuite.
Step 1 :
First fixed the required footing material purity for grain ( Before adding the slurry). We assume the grain purity is 64.
Here using AH + CL using as graining material ( Consider 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 = 60/1.42 = 42M3 = 420HL.
Graining Volume of batch pan = 42 x 45 %= 19M3 = 190HL.
Weight of the graining material = Volume x specific gravity = 19 x 1.42 = 27MT.
Solids in graining material = 27 x 87 /100 = 23.5MT. (Consider grain brix – 87%)
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 23.5 = 4.70MT.
Solids from CL for grain material = 23.31 – 4.70 = 18.8MT.
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 | 4.6 (6.267/1.35) |
46 |
CL | 18.8 | 62 | 75 | 25.07 | 18.57 (25.07/1.35) |
186 |
Step 2 :
After harding the the grain further fill up with B Heavy molasses ( Consider Brix 76 & purity 51 ).
Solids in C grain at the time of pan cutting to vacuum crystallizer = 60MT x 92 /100 = 55.20MT.
Solids from BH molasses for further fill-up of C grain pan =55.20 – 23.5 = 31.7MT
Weight of the BH molasses = 31.69 x100/ 76 = 42.25MT
Volume of the BH molasses = 42.25 /1.36 = 31.06 M3 = 310HL.
Final C Grain Purity = [ (Solids in initial grain x Purity of initial grain) + ( solids in BH x Purity of BH) ] / solids in final dropping C grain.
= [ (23.50 x 64) + (31.7 x 51)] / 55.20 =56.53.
Step 3 :
Now 50% material transfer to vacuum crytsallizer and then pan boiled with BH molasses ( Brix 76 & purity 51 ) only and dropped as a C massecuite.
Consider C massecuite dropping brix will be around 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 required for C massecuite boiling = 59.70 – 27.60 = 32.10.
Weight of the BH molasses for C m/c = 32.10 x100/ 76 = 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 Purity of grain) + ( solids in BH x Purity of BH) ] / solids in C massecuite
= [ (27.60 x 56.53) + (32.10 x 51)] / 59.7 = 53.56.
Example No.2 :
Grain prepared in 60T batch pan then it was feed to 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 we have to conclude the footing material purity for graining ( Before adding the slurry) as per the available material. Then find the C grain dropping purity.
AH | ||||
72 | 2 | (65-63) | ||
Graining Material | ||||
65 | ||||
CL | ||||
63 | 7 | (72-65) | ||
9 | (7 + 2) |
We assume for C grain taken C Light & A Heavy as a footing material than further fill up with B heavy molasses.)
S.No | Particulars | Values | UOM | Remarks |
1 | Solids in C Grain | 52.8 | MT | 60 x 88 /100 |
2 | Voume of the pan | 41.8 | M3 | 52.8 / 1.435 |
418 | HL | 41.8 x 10 | ||
3 | Graing Volume | 188.2 | 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 grain material | 5.2 | MT | 23.22 x 2 / 9 |
7 | Solids from CL for grain material | 18.1 | MT | 23.22 – 5.2 |
8 | Weight from AH for grain material | 6.88 | MT | 5.2 x 100 / 75 |
9 | Weight from CL for grain material | 24.08 | MT | 18.1 x 100 / 75 |
10 | Volume from AH for grain material | 5.15 | M3 | 6.88/1.337 |
51 | HL | 5.15 x 10 | ||
11 | Volume from CL for grain material | 18.01 | M3 | 24.08 / 1.337 |
180 | HL | 18.01 x 10 | ||
12 | Solids from BH to further filling of the grain pan | 29.58 | MT | 52.8 – 23.22 |
13 | Weight from BH to further filling of the grain material | 36.98 | MT | 29.58 x 80 /100 |
14 | Volume from BH to further filling of the grain material | 26.39 | 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 :
Now we will calculate the C massecuite dropping purity from continuous pan.
For C continuous pan we feed C grain and boiled with B Heavy molasses as per the grain and molasses ratio.
S.No | Description | UOM | Values | |
1 | C massecuite Quantity ( C continuous pan capacity) | T/hr | 20 | |
2 | BH molasses brix | % | 80 | |
3 | BH molasses purity | % | 53 | |
4 | C Grain Brix | % | 86 | |
5 | C Grain Purity | % | 59.2 | |
6 | C Massecuite Brix | % | 99.00 | |
7 | Grain /Molasses Ratio | Grain (take 1) | 1 | |
Molasses | 3 | |||
S.No | Description | UOM | Values | Remarks |
C Massecuite dropping purity | ||||
1 | Massecuite to be produced | T/hr | 20 | |
2 | Total Solids in C massecuite | T/hr | 19.8 | 20 x 99/100 |
3 | Solids in C grain ( to be feed cont. pan) |
T/hr | 4.95 | 19.8 x 1 / ( 1+3) |
4 | Solids in B Heavy molasses used C massecuite boiling | T/hr | 14.85 | 19.8 – 4.95 |
5 | Grain feeding Quantity |
T/hr | 5.76 | 4.95*100/86 |
6 | BH molasses quantity for C massecuite boiling |
T/hr | 18.56 | 14.85*100/80 |
7 | C massecuite dropping purity | % | 54.54 | ((4.95*59.2)+(14.85*53))/19.8 |
Steam Required for Continuous pan | ||||
1 | Evaporation rate in grain | % | 13.13 | (99-86)*100/99 |
2 | Evaporation rate in BH molasses | % | 19.19 | (99-80)*100/99 |
3 | Steam Required for C Cont. Pan | T/hr | 4.3 | 5.76 x 13.13% + 18.56 x 19.19% |
4 | Moment Water @ 10% on massecuite | T/hr | 2.0 | 5 to 10% on massecuite |
5 | Total Steam Required for C massecuite | T/hr | 6.3 | 4.3+2.0 |
6 | Specific steam of C massecuite ( Ton of steam/Ton of massecuite) |
0.32 | 6.3/20 |
Related Articles:
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7 thoughts on “C massecuite final purity calculation |Grain Quantity requirement for C CVP”
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