Water → Urea oxalate

HRID 426537Notes

Reaction equation

HRID 426537 reaction equation
P(O)(O)(O)=O.[NH2:6][C:7]([NH2:9])=[O:8].[C:10]([OH:15])(=[O:14])[C:11]([OH:13])=[O:12].O>P(=O)(O)(O)O>[C:10]([OH:15])(=[O:14])[C:11]([OH:13])=[O:12].[NH2:6][C:7]([NH2:9])=[O:8]

Participants

5

Reactant 3

HCID 962WaterHCID 971Oxalic AcidHCID 20994Urea phosphoric acid

Product 1

HCID 13685621Urea oxalate

Reagents, catalysts & solvents 1

HCID 1004Phosphoric AcidSolvent2×

Procedure

Referring now more specifically to the FIGURE, 3 represents any vessel suitable for containing the reaction mixture. Urea phosphate 2, oxalic acid 1, and water in the form of dilute phosphoric acid 4 are fed to reactor 3 to form a slurry of urea oxalate in purified phosphoric acid. The slurry is fed via line 5 to cooler 6 and then via line 7 to filtering and washing apparatus 8. The filtrate is purified phosphoric acid and it is withdrawn via line 9 as product. The urea oxalate filter cake is washed with water via line 10 to recover the adhering phosphoric acid. The filtrate from the washing step is dilute phosphoric acid which is recycled to reactor 3 via line 4. The urea oxalate filter cake from apparatus 8 is fed via line 11 to reactor 12 where it is heated to thermally decompose it into oxamide and urea with the expulsion of water and carbon dioxide. Or, if desired, part or all of the urea oxalate filter cake from apparatus 8 is fed via line 13 to reactor 15 where it is neutralized with ammonia fed via line 14 to produce a mixture of urea and ammonium oxalate.

Workup

  1. additionfor containing the reaction mixture

Sources & evidence

ORD record
ord-8cea06fc78f24010817ea80c12cc5ecf
Source dataset
uspto-grants-1979_10
Patent number
US04169882

Reaction notes

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