Citric Acid → Trisodium citrate

HRID 2248996Notes

Reaction equation

HRID 2248996 reaction equation
[C:1]([OH:13])(=[O:12])[CH2:2][C:3]([CH2:8][C:9]([OH:11])=[O:10])([C:5]([OH:7])=[O:6])[OH:4].[OH-].[Na+:15]>O>[C:1]([O-:13])(=[O:12])[CH2:2][C:3]([CH2:8][C:9]([O-:11])=[O:10])([C:5]([O-:7])=[O:6])[OH:4].[Na+:15].[Na+:15].[Na+:15]

Participants

4

Reactant 2

HCID 311Citric Acid2×HCID 14798Sodium Hydroxide

Product 1

HCID 6224Trisodium citrate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
78 °C

Procedure

A 1 liter beaker was charged with 350 ml (462 g) citric acid process mother liquor containing 260.5 g citric acid and 201.5 g H2O. While stirring, 325.9 g of 50% (w/w) NaOH solution was added to bring the pH to 6.6. The solution was heated to 78° C. and filtered to remove impurities. The hot solution was placed in a 5 liter, 3 neck round bottom flask fitted with a reflux condenser, stirrer and heating mantle. The solution was heated to 80° C. and 1500 ml (1184 g) ethyl alcohol was added at a rate of 30 ml per minute which resulted in the formation of a slurry of tri-sodium citrate crystals. The flask was heated to the ethanol's reflux temperature which provided better crystal formation.

Workup

  1. filtrationfiltered
  2. customto remove impurities
  3. customfitted with a reflux condenser, stirrer
  4. temperatureheating mantle
  5. temperatureThe solution was heated to 80° C.
  6. addition1500 ml (1184 g) ethyl alcohol was added at a rate of 30 ml per minute which

Sources & evidence

ORD record
ord-5226bf23865f47c9aaf3e007905af0e2
Source dataset
uspto-grants-1991_08
Patent number
US05041645

Reaction notes

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