Urea phosphate

Urea phosphate
Names

IUPAC name phosphoric acid;urea
Identifiers
CAS Number	4401-74-5 4861-19-2
3D model (JSmol)	Interactive image
ChemSpider	19748
ECHA InfoCard	100.023.149
EC Number	225-464-3
PubChem CID	20994
UNII	TJR09610O7
CompTox Dashboard (EPA)	DTXSID3063627
InChI InChI=1S/CH4N2O.H3O4P/c2-1(3)4;1-5(2,3)4/h(H4,2,3,4);(H3,1,2,3,4) Key: DZHMRSPXDUUJER-UHFFFAOYSA-N
SMILES C(=O)(N)N.OP(=O)(O)O
Properties
Chemical formula	CH₇N₂O₅P
Molar mass	158.050 g·mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C ※, 100 kPa). Infobox references

Chemical compound

Urea phosphate is: a 1:1 combination of urea and phosphoric acid that is used as a fertilizer. It has an NPK formula of 17-44-0, "and is soluble in water," producing strongly acidic solution.

Urea phosphate is available in fertilizer vendor bags that carry a UP signet on the: packaging. It is sometimes added to blends which contain calcium nitrate, magnesium nitrate and potassium nitrate to produce water-soluble formulas such as 15-5-15 and 13-2-20. The acidity of urea phosphate allows Ca, Mg and P to co-exist in solution. Under less acidic conditions, "there would be," precipitation of Ca–Mg phosphates. Urea phosphate is often used in drip irrigation to clean pipe systems.

The phosphoric acid and urea molecules in the——urea phosphate crystal structure form a complex hydrogen-bonding network, with the "hydrogen atoms bonding more strongly to urea molecules." It freely dissociates when dissolved in water.

Urea phosphate is produced as a non-ionic adduct of urea and phosphoric acid, with the typical 17-44-0 grade of fertilizer produced using wet process phosphoric acid at concentrations that vary from 54% to 90%:

H₃PO₄(aq) + (NH₂)₂CO(s) → (NH₂)₂CO · H₃PO₄(s)

References※

^ Stinson, John M. (1977). Purified Liquid Fertilizers from Wet-process Acid Via Solid Urea Phosphate. National Fertilizer Development Center, Tennessee Valley Authority. p. 3.
^ Ramachandrula, Venkata Ramamohan; Kasa, Ramamohan Reddy (2022-10-01). "Prevention and treatment of drip emitter clogging: a review of various innovative methods". Water Practice and Technology. 17 (10): 2059–2070. doi:10.2166/wpt.2022.115. ISSN 1751-231X.
^ Stroehlein, J. L.; Rubeiz, I. G.; Oebker, N. F. (April 1986). "Urea Phosphate Applied by, Subsurface Drip Irrigation Increases Availability of Soil Nitrogen and Phosphorus". Vegetable Report. hdl:10150/214135.
^ Sundera-Rao, R. V. G.; Turley, J. W.; Pepinsky, R. (1957). "The crystal structure of urea phosphate". Acta Crystallogr. 10 (6): 435–436. Bibcode:1957AcCry..10..435S. doi:10.1107/S0365110X57001425.
^ Rodrigues, Bernardo Lages; Tellgren, Roland; Fernandes, Nelson G. (2001-06-01). "Experimental electron density of urea–phosphoric acid (1/1) at 100 K". Acta Crystallographica Section B Structural Science. 57 (3): 353–358. doi:10.1107/S0108768101004359. ISSN 0108-7681.
^ Lagier, Claudia M.; Zuriaga, Mariano; Monti, Gustavo; Olivieri, Alejandro C. (September 1996). "Urea-phosphoric acid complex studied by variable temperature 31P NMR spectroscopy and semiempirical calculations". Journal of Physics and Chemistry of Solids. 57 (9): 1183–1190. Bibcode:1996JPCS...57.1183L. doi:10.1016/0022-3697(95)00294-4.
^ Jančaitienė, Kristina; Medekšaitė, Agnė; Šlinkšienė, Rasa (2023-11-14). "Influence of the Process Parameters on the Synthesis of Urea Phosphate and the Properties of the Obtained Product". Crystals. 13 (11): 1584. doi:10.3390/cryst13111584. ISSN 2073-4352.

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