TRISODIUM PHOSPHATE (TSP)

TRISODIUM PHOSPHATE (TSP)

Chemical formula: Na3HPO4. XH2O (X=0,12)

Molecular weight: 380.12

CAS.NO:7601-54-9 (Anhydrous) 10101-89-0 (Dodecahydrate)

H.S.CODE:28352910

Capacity: 20,000MT/a

Properties:
White or colorless crystals, efflorescent in air, easily soluble in water but not in organic solution. Its water solution is alkaline. PH value of 1% solution is 12.1, relative density at 1.62, melting point is 73.4 ℃ .

Specifications :

No.	Specifications	Na3PO4		Na3PO4•12H2O
No.	Specifications	Industrial	Food	Industrial	Food
1	Main contents% ≥	98.0	98.0	98.0	98.0
2	Phosphorus pentoxide% ≥	39.5	39.5	18.3	18.3
3	Sodium oxide, as Na2O% ≤	36-40	36-40	15.5-19	15.5-19
4	Sulfate, as SO4 % ≤		0.25	0.5	0.5
5	Heavy metal, as Pb% ≤		0.001	-	0.001
6	Arsenic, as As% ≤		0.0003	-	0.0003
7	Fluoride as F% ≤		0.005	-	0.005
8	Water insoluble% ≤	0.10	0.10	0.10	0.10

Application:
Used as a water softening agent, cleaning agent in electroplating, color fixer in fabric dyeing and flux in enamel ware manufacturing and so on.

Packaging: 25kg PP bags.

Production Process:

Na2HPO4+NaOH→Na3PO4+H2O

1. A process for the production of trisodium phosphate dodecahydrate Na3 PO4. 12H2 O. 1/4NaOH which comprises

2. preparing a solution of trisodium phosphate having a molar ratio of sodium to phosphorus of about 3.25:1,

3. adding to said solution an amount of sodium sulfate in the range of 0.2 to 0.8 percent, by weight of dry trisodium phosphate salt therein,

4. evaporating said solution to cocrystallize said trisodium phosphate dodecahydrate with said sodium sulfate from said solution thereby to produce a trisodium phosphate dodecahydrate having the characteristic that it is stable in storage under ordinary variations of humidity and temperature without deterioration of the crystal and without the formation of agglomerated particles or cakes.

5. A process in accordance with claim 1, wherein the amount of sodium sulfate added is 0.30 percent of the trisodium phosphate dodecahydrate crystals.

6. A process in accordance with claim 1, wherein evaporation is carried out in continuous fashion, such that product is produced at a temperature between 40° and 55° C.

7. A process in accordance with claim 1, wherein the amount of sodium sulfate added is 0.5 percent, by weight, of the trisodium phosphate

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