Ammonia → Ammonia

HRID 1419682Notes

Reaction equation

HRID 1419682 reaction equation
[NH2:1][C@H:2]([C:7]([OH:9])=[O:8])[CH2:3][C:4]([OH:6])=[O:5].[NH3:10]>O>[NH2:1][C@H:2]([C:7]([O-:9])=[O:8])[CH2:3][C:4]([O-:6])=[O:5].[NH4+:10].[NH4+:1].[NH3:1]

Participants

5

Reactant 2

HCID 222AmmoniaHCID 5960L-Aspartic Acid

Product 2

HCID 222AmmoniaHCID 86590683Ammonium Aspartate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

An ammonium aspartate solution is prepared in a reactor with a capacity of 2 liters by suspending 133.1 g (1 mol) of aspartic acid in 500 g of water with stirring and adding 68 g (1 mol) of 25% strength aqueous ammonia solution. The resulting clear solution corresponds to the composition of an ammonium aspartate solution as produced by enzymatic addition of ammonia onto fumaric acid after removal (stripping) of excess ammonia. 98 g of concentrated sulfuric acid are added to the solution over the course of 30 minutes, during which the aspartic acid precipitates. The complete suspension is evaporated to dryness under water pump vacuum while stirring at 130° C., and the thick melt remaining as residue is polycondensed for 4 hours under water pump vacuum at 180° C. to form a foam. The solidified foam is broken up at intervals to produce powder particles 0.1-5 mm in size. After cooling, the polycondensate is taken up in 2 liters of water. The residue is filtered off and washed with water and dried at 70° C. The yield of polyaspartimide is 96.6 g (99.6% of theory). The K value of the sodium polyaspartate is 35.9.

Workup

  1. customAn ammonium aspartate solution is prepared in a reactor with a capacity of 2 liters

Sources & evidence

ORD record
ord-250bd7f112db4c3cbf5c45d0bc9ee24a
Source dataset
uspto-grants-1999_03
Patent number
US05888959

Reaction notes

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