DICALCIUM PHOSPHATE
(FROM SULPHURIC ACID) CAP: 6TPD
[CODE NO.3184]
Dicalcium phosphate is the calcium phosphate with the formula CaHPO4 and its dihydrate. The "di" prefix in the common name arises because the formation of the HPO42– anion involves the removal of two protons from phosphoric acid, H3PO4. It is also known as dibasic calcium phosphate or calcium monohydrogen phosphate.
Dicalcium phosphate is used as a food additive, it is found in some toothpastes as a polishing agent and is a biomaterial.
Dibasic calcium phosphate is produced by the neutralization of calcium hydroxide with phosphoric acid, which precipitates the dihydrate as a solid. At 60°C the anhydrous form is precipitated:
H3PO4 + Ca(OH)2 → CaHPO4
To prevent degradation that would form hydroxyapatite, sodium pyrophosphate or trimagnesium phosphate octahydrate are added when for example, dibasic calcium phosphate dihydrate is to be used as a polishing agent in toothpaste.
In a continuous process CaCl2 can be treated with (NH4)2HPO4 to form the dihydrate:
CaCl2 + (NH4)2HPO4 → CaHPO4•2H2O
A slurry of the dihydrate is then heated to around 65–70°C to form anhydrous CaHPO4 as a crystalline precipitate, typically as flat diamondoid crystals, which are suitable for further processing.
Dibasic calcium phosphate dihydrate is formed in "brushite" calcium phosphate cements (CPC's), which have medical applications. An example of the overall setting reaction in the formation of "β-TCP/MCPM"(β-tricalcium phosphate/monocalcium phosphate) calcium phosphate cements is:
COST ESTIMATION
Plant Capacity : 6.00 Ton/day
land & Building (2 Acres) : Rs. 4.50 Cr
Plant & Machinery : Rs. 4.00 Cr
Working Capital for 2 Months : Rs. 92.68 Lacs
Total Capital Investment : Rs. 9.68 Cr
Rate of Return : 15%
Break Even Point : 66%
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