Citric Acid → Trisodium citrate

HRID 1707404Notes

Reaction equation

HRID 1707404 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]>>[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

3

Reactant 2

HCID 311Citric Acid2×HCID 14798Sodium Hydroxide

Product 1

HCID 6224Trisodium citrate

Procedure

A citric acid process stream (about 50% by weight citric acid) was neutralized to pH 8 with a 50% sodium hydroxide solution and then concentrated. 50 ml of concentrated solution was poured into an erlenmeyer flask with stirrer bar. The solution was stirred until it became turbid. At this point, 10 g of sodium hydroxide pellets were added as the crystallizing base. The sodium salt of citric acid started to crystallize rapidly. The mixture was stirred for 2 hours and gradually cooled to room temperature. The mixture was poured into a basket centrifuge and the crystals separated from the mother liquor and collected. The recovery was 92% and the impurities such as carbonizables and color were reduced by more than 90%.

Workup

  1. concentrationconcentrated
  2. addition50 ml of concentrated solution was poured into an erlenmeyer flask with stirrer bar
  3. additionAt this point, 10 g of sodium hydroxide pellets were added as the crystallizing base
  4. customto crystallize rapidly
  5. stirringThe mixture was stirred for 2 hours
  6. additionThe mixture was poured into a basket centrifuge
  7. customthe crystals separated from the mother liquor
  8. customcollected

Sources & evidence

ORD record
ord-6ca323ddd101414e841231c5a5760962
Source dataset
uspto-grants-1994_10
Patent number
US05352825

Reaction notes

Loading…