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

## 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:

Three massecuite boiling solid balance calculation.

## 7 thoughts on “C massecuite final purity calculation |Grain Quantity requirement for C CVP”

#### Dighe Annaso Tatya

(December 18, 2017 - 5:59 pm)

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#### siva alluri

(December 19, 2017 - 1:47 pm)

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(December 18, 2017 - 8:55 pm)

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#### siva alluri

(December 19, 2017 - 1:47 pm)

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#### ARUN KUMAR PAL

(February 9, 2018 - 8:07 am)

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(March 7, 2023 - 6:55 am)

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(March 8, 2023 - 12:30 pm)

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