Hydrochloric Acid → Tetrasodium Pyrophosphate

HRID 1855790Notes

Reaction equation

HRID 1855790 reaction equation
O.O.O.O.O.O.O.O.O.O.[O-:11][P:12]([O:15][P:16]([O-:19])([O-:18])=[O:17])(=[O:14])[O-:13].[Na+:20].[Na+].[Na+].[Na+].Cl>O>[O-:13][P:12]([O:15][P:16]([O-:19])([O-:18])=[O:17])(=[O:11])[O-:14].[Na+:20].[Na+:20].[Na+:20].[Na+:20]

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 3084150Sodium pyrophosphate decahydrate

Product 1

HCID 24403Tetrasodium Pyrophosphate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent2×

Procedure

Two solutions of tetrasodium pyrophosphate were prepared by dissolving 20 g. of tetrasodium pyrophosphate decahydrate in 80 ml. of water and adjusting the pH to 7.0 (Solution 1) and 8.0 (Solution 2), respectively, with hydrochloric acid. A total of 100 g. of native tapioca starch was suspended in 125 ml. water, adjusted to pH 7.0 (Starch 1) and filtered on a Buchner funnel as described in Example IV. A total of 60 g. of Solution 1 was poured onto the filter cake of Starch 1, uniformly covering the entire surface, and vacuum was applied until the liquid filtered through the starch cake. The amount of phosphate salt retained was about 12%, based on starch solids. The above filtering procedure was repeated except that before filtration the starch was adjusted to pH 8.0 (Starch 2), and Solution 2 was used instead of Solution 1. The amounts of filtrate and phosphorus content of each filtrate are indicated in Table III. The impregnated cakes were thereafter dried at 140° C., and a portion of each dried sample was further heat-reacted in a forced-air oven at 140° C. to form Starches 1B and 2B. As can be seen from Table III, phosphorylated materials were obtained with only minimal loss of phosphate to the filtrate.

Workup

  1. dissolutionby dissolving 20 g
  2. filtrationfiltered on a Buchner funnel
  3. additionof Solution 1 was poured onto the filter cake of Starch 1
  4. filtrationfiltered through the starch cake
  5. filtrationThe above filtering procedure
  6. filtrationwas repeated except that before filtration the starch
  7. customThe impregnated cakes were thereafter dried at 140° C.
  8. customa portion of each dried sample was further heat-reacted in a forced-air oven at 140° C.

Sources & evidence

ORD record
ord-76fdc0a2244f4f0e973188ca68b660a7
Source dataset
uspto-grants-1980_08
Patent number
US04216310

Reaction notes

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