Urea → Einecs 256-823-2

Participants

Reaction Steps

50 g. of urea was further added to the mother liquor with the urea-glutaric acid adduct removed and dissolved at 60° C. The resulting solution was then cooled to and allowed to stand at 15° C. for 5 hours to crystallize a urea-succinic acid adduct out of the solution. By filtration, 52 g. of urea-succinic acid adduct (including 22.0 g. of succinic acid) was obtained. Subsequently, the urea-succinic acid adduct was dissolved in 300 g. of water at 30° C. and the resulting solution was treated with the same strongly acidic ion exchange resin as mentioned above to remove urea. 200 g. of water was then distilled off from the treated solution and the solution was cooled to and allowed to stand at 10° C. to crystallize succinic acid. By filtration, 20 g. of succinic acid having a purity of 98% was obtained.

Provenance & Evidence