Medicinal grade disodium hydrogen phosphate cas7558-79-4 use

Medicinal grade disodium hydrogen phosphate cas7558-79-4 use of disodium hydrogen phosphate used as a water softener, fabric weight enhancer, fire retardant, and used in glazes, welds, medicine, pigments, food industry and other phosphate used as industrial water quality treatment agent, printing and dyeing detergent, quality improver, neutralizer, antibiotic culture agent, biochemical treatment agent Food quality improver spray drying method: the disodium hydrogen phosphate hydrogen phosphate is added to the solution decomposition tank to heat and dissolve, and a small amount of industrial phosphoric acid is added, Adjust the pH value 8.
8~9.
0, the solution temperature 80~85°C, pump to the metering tank, atomize by the sprayer, the atomizer selects a two-flow vapor nozzle, the steam pressure is 0.
15~0.
3MPa, the nebulizer vapor flow conduction angle is 30
horizontally.

, vapor-liquid ratio (0.
4~5): 1
.

The inlet temperature of hot furnace gas is 650~750°C
.

It can be dried in parallel flow or counter-current
.

If it is dried countercurrent, the inlet temperature is 620~650°C, and the outlet temperature is 140~150°C
.

The finished product particle size is about 90um and 60%, and the moisture content is < 1%.


Preparation of anhydrous disodium hydrogen phosphate finished product
.

【Content determination】Take about 2.
5g of this product, weigh it precisely, add 25ml of boiling and cold water to dissolve, add 25ml of hydrochloric acid titration solution (1mol/L) with precision, according to potentiometric titration (general rule 0701), titrate with sodium hydroxide titration solution (1mol/L), record the first jump point consumption of sodium hydroxide titration liquid product N1 and the second jump point consumption of sodium hydroxide titration solution total volume N2, The content is calculated from the sodium hydroxide titration product consumed at the first hop point, and the titration results are corrected for N3
with a blank test.

Each 1 ml of hydrochloric acid titration solution (lmol/L) corresponds to 142.
0 mg of Na2HPO4
.

This product is calculated as a dry product, containing Na2HPO4 shall not be less than 99.
0%.
【Properties】This product is white or off-white powder
.

This product is easily soluble in water and almost insoluble
in ethanol.

【Identification】The aqueous solution of this product shows the identification reaction between sodium salt and phosphate (General 0301).


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