Phosphate monoammonium

Monoammonium Phosphate. Monoammonium phosphate [7722-76-1] (MAP), NH4H2PO4, has become second only to diammonium phosphate as a phosphate fertilizer material of trade. During the year ended June 30, 1990, monoammonium phosphate used ia the United States furnished 985 thousand t of P2O5 as compared to 1.5 million t furnished by diammonium phosphate and 240 thousand t by triple superphosphate (Fig. 7). Monoammonium phosphate furnished 25% of total P2O5 consumption. 

Scotts technology (17) uses fluid-bed (Wurster column) technology to apply polymeric coatings to a number of fertilizer substrates including urea, potassium nitrate, potassium sulfate, and monoammonium phosphate (MAP). The coating material is appHed as a water-borne latex onto the fluidized substrate. As the substrate is fluidized with warm air (40—50°C), water is driven off and the latex coalesces into a continuous film around the fertilizer particle. The particular latex compositions used have selected glass-transition and blocking temperatures, which enable quick removal of the water before the soluble fertilizer core dissolves. This obviates the need to use precoats prior to the latex appHcation. 

The sodium bicarbonate suppressant attains almost equivalence in performance with the monoammonium phosphate powder. Water has proven to be a very effec tive suppressant of dust, especially grain and Fodder dusts. A suppressant is regarded as being veiy effec tive when an increase of the artivatiou pressure of the explosion system leads... 

Monoammonium phosphate Diammonium phosphate Nitric oxide Actylonitrile Caprolactam Monomethylamine Dimetliylamine Hexametliylenetetramine Trimetliylamine Monoethanolamine Dietlianolamine Trietlianolamine Hydrogen Cyanide Fatty nitrogen compounds (nitriles, amines, quaternary ammonimn compounds)... 

Gardinier A process for making monoammonium phosphate from gaseous ammonia and phosphoric acid by mixing them in a helical reactor. See also Swift. 

Swift A process for making monoammonium phosphate from liquid ammonia and phosphoric acid. The reactants are mixed with a special nozzle. The slurry product from the neutralization is injected into the top of a heated tower water flashes off as the product falls and the powdered product collects at the base of the column. See also Gardinier. 

Monoammonium phosphate (MAP), 77 120-121 72 67 78 835 manufacture of, 78 854 Monoatomic oxygen, 70 642 Monoazo dyes, 9 245, 395 Monoazo Orange, colorant for plastics, 7 374t... 

There are several types of dry chemical extinguishing agents. The three most popular are sodium bicarbonate, potassium bicarbonate (Purple K), and monoammonium phosphate. 

The ammonium phosphates took over the lead in 1967. Diammonium phosphate (DAP) is made from wet process phosphoric acid of about 40% P2O5 content and ammonia. The usual finishing NH3 H3P04 mole ratio is 1.85-1.94 1. Monoammonium phosphate (MAP) is made with a final NH3iH3P04 ratio of 1 1. Current production percentages for phosphate fertilizers are DAP, 67% MAP, 26% and TSP, 7%. 

Heating at 70°C results in decomposition to monoammonium phosphate and ammonia ... 

Eickner and Schaffer (10) found that monoammonium phosphate (Figure 2) was the most effective of different fire-retardant chemicals in reducing the flame-spread index of Douglas-fir plywood. They used the 8-foot tunnel furnace of ASTM E286 (37). 

The untreated plywood had a flame-spread index of 115. This was reduced to about 55 at a chemical retention of 2 pounds per cubic foot, to 35 at 3 pounds, 20 at 4 pounds, and to about 15 at retentions of 4.5 pounds and higher. Zinc chloride was next in effectiveness but required higher retention levels to reduce the flame-spread index values equivalent to monoammonium phosphate. 

Two salts are manufactured by combining ammonia with phosphoric acid diammonium phosphate (DAP) and monoammonium phosphate (MAP). 

Melamine diborate (MB), known in the fire-retardant trade as melamine borate, is a white powder, which can be prepared readily from melamine and boric acid. It is partly soluble in water and acts as an afterglow suppressant and a char promoter in cellulosic materials. Budenheim Iberica79 claims that, in a 1 1 combination with APP, MB (10%-15%) can be used for phenolic bound nonwoven cotton fibers. In general, melamine borate can be used as a char promoter in intumescent systems for various polymers including polyolefins or elastomers. However, its low dehydration temperature (about 130°C) limits its application in thermoplastics that are processed at above 130°C. Melamine borate is also reported to suppress afterglow combustion in flame-proofing textiles with APP or monoammonium phosphate to meet the German DIN 53,459 and Nordtest NT-Fire 002.80... 

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