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Rozwój technologii wytwarzania nawozów płynnych na bazie polifosforanu(V) amonu

Zielińska Edyta, Grzmil Barbara, Zienkiewicz Monika

Przemysł Chemiczny

2021

T. 100, nr 10

923--927

Zaprezentowano główne metody otrzymywania kwasu polifosforowego(V) oraz roztworów nawozowych na bazie polifosforanu(V) amonu (APP). Przedstawiono wpływ stosowanych surowców oraz sposobu prowadzenia procesu wytwarzania APP na stopień kondensacji produktu końcowego. Omówiono możliwość mieszania nawozów bazowych APP z innymi nawozami płynnymi oraz przedstawiono rozpuszczalność mikroskładników w roztworach polifosforanów(V) i ortofosforoanów(V). Opisano główne problemy związane z otrzymywaniem APP, takie jak korozja aparatury, wytrącanie się osadów i hydroliza skondensowanych form fosforanów.

A review, with 36 refs., of manufg. polyphosphoric acid methods as well as the fertilizer solns. based on titled compd. (APP). The effect of the raw materials and APP production process type on the polyphosphate content in the final product was shown. The possibility of mixing APP base fertilizers with other liquid fertilizers was discussed, and the soly. of micronutrients in solns. of polyphosphates and orthophosphates was indicated. The problems related to the corrosion of the equipment, pptn. and hydrolysis of condensed forms of phosphates were described.

The synergistic effect of boric acid and ammonium polyphosphate on the thermal degradation and flammability of pine-needles

Li L., Hu H., Guo C., Hu H.

Drewno : prace naukowe, doniesienia, komunikaty

2014

vol. 57, nr 193

37--49

The synergistic effect of ammonium polyphosphate (APP) and boric acid (BA) on the flame retardancy and thermal degradation of pine needles was investigated. Thermogravimetric analysis (TGA) showed that the presence of an ammonium polyphosphate and boric acid system increased the char residue and decreased the pyrolysis temperature of the pine needles. The derivative thermogravimetric analysis (DTG) showed that the ammonium polyphosphate and boric acid had shifted the degradation peaks of the pine needles to lower temperatures. The cone calorimetry test results showed that the values of HRR, THR, SPR, TSP and the mass loss (%) of the pine needles treated with ammonium polyphosphate and boric acid (APP/BA = 3/2) were significantly lower than the other samples. Therefore, the APP and BA system had a better effect on the pine needles overall than the APP alone.

Polycondensation of urea phosphate to ammonium polyphosphate

Hoffmann J.

Polish Journal of Chemical Technology

2000

Vol. 2, nr 2

8-12

Ammonium polyphosphate of average chain length n = 2.5 - 3.0 can be obtained through the polycondensation of urea phosphate at a temperature of 140 - 160°C. The phosphates fraction in the product amounts to about 90% whereby it has a high capacity to chelate fertilizer microelements. The effect of such parameters as temperature and reaction time on the composition and kinetics of the reaction was assessed by means of derivatographic and model tests.