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You are at:Home»Crysatllisation»C massecuite final purity calculation |Grain Quantity requirement for C CVP

C massecuite final purity calculation |Grain Quantity requirement for C CVP

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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.

C massecuite final purity calculation |Grain Quantity requirement for C CVP

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

Online calculation for C massecuite purity

Click Here

Three and half massecuite boiling material balance calculation.

Three massecuite boiling solid balance calculation.

 

C massecuite purity dropping purity Material Balance solid balance
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