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

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 batch pan and example another is grain prepared in batch pan and massecuite prepared in continuous vacuum pan(CVP). Online calculation sheet also provided.

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 ( Take C grain with AH + BH + CL in 60T batch pan, After it is cutting 50% to vacuum crystalizer then further use only BH molasses upto dropping the massecuite).

Step 1 :

First fixed the required footing material purity for grain ( Before adding the slurry) suppose to be take 64

Here using 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 transfer to 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 prepared in 60T batch pan then it send 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 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 filling of 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 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