Urea → Einecs 256-823-2

Participants

Reaction Steps

50 g. of urea was further added to the mother liquor with the glutaric acid adduct removed and dissolved at 60° C. The resulting solution was cooled to and allowed to stand at 15° C. for 4 hours to precipitate a urea-succinic acid adduct. By filtration, 51 g. of urea-succinic acid adduct (including 23 g. of succinic acid) was obtained. The obtained urea-succinic acid adduct was then dissolved in 300 g. of water at 30° C. and the solution was treated with the same strongly acidic ion exchange resin as mentioned above to remove urea. 200 g. of water was removed from the treated solution and on subsequent cooling to and allowing to stand at 10° C. for 3 hours, succinic acid crystallized out of the solution. By filtration, 20 g. of succinic acid having a purity of 99% was obtained.

Provenance & Evidence