Production process of trisodium phosphate

(1) Preparation of trisodium phosphate The preparation method is as follows:
1. Using pure: disodium hydrogen phosphate solution obtained after neutralizing phosphoric acid, concentrated to 15 ° Be', adding liquid
Body calcination; (29.5%), and continue to concentrate to 24 ~ 30 ° Be ', wait until the reaction occurs in the CO2
After all escaped, it was filtered on a filter press.
2. The filtrate is placed in a crystallizer for crystallization, and then dehydrated by a centrifuge to obtain trisodium phosphate.
3. The chemical reaction formula is as follows:
H3PO4+Na2CO3→Na2HPO4+H2O+CO2↑
Phosphoric acid pure bismuth disodium hydrogen phosphate water dioxane carbon
4. The third hydrogen atom in the formula of disodium hydrogen phosphate is neutralized by calcination to form trisodium phosphate. anti-
Should be as follows:
Na2HPO4+NaOH→Na3PO4+H2O

Disodium hydrogen phosphate sodium hydroxide trisodium phosphate water