Production of urea phosphate

Details Production of urea phosphate Production of urea phosphate

1982-05-10

1984-07-24

Hines, Robert V.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

260439R, 564 73, C07C12608, C07C12701, C07F 1504

Patent

active

044619138

ABSTRACT:
A two-stage continuous crystallization process for production of urea phosphate by reaction of impure wet-process orthophosphoric acid (about 54 percent P.sub.2 O.sub.5) and urea with simultaneous addition of a selected acidifying agent (sulfuric acid, hydrochloric acid, or phosphoric acid) to clarified mother liquor used as recycle in the process. Addition of the acidifying agent decreases pH in the crystallization process whereby the solubility of a contaminating water-insoluble iron phosphate-urea salt [FeH.sub.3 (PO.sub.4).sub.2.2CO(NH.sub.2).sub.2 ] is increased, purity of the crystalline urea phosphate product is improved significantly, and the useful storage life of the recycle mother liquor is prolonged.

REFERENCES:
patent: 1951518 (1934-03-01), Meiser et al.
patent: 3058810 (1962-10-01), Huxley et al.
patent: 3180735 (1965-04-01), Titus
patent: 4169882 (1979-10-01), Sheridan
patent: 4217128 (1980-08-01), Stinson et al.
New Routes, "Chemical and Engineering News", p. 22, Sep. 1, 1975.
Kume, "Petroleum Refiner", vol. 39, No. 5, pp. 200-201, (1960).

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