Pilot-plant production of ammonium polyphosphate sulfate suspension fertilizers

Conference · Sun Jan 01 00:00:00 EST 1984

OSTI ID:6071009

Mann, H C; McGill, K E; Holt, M T

TVA is developing a process for production of ammonium polyphosphate sulfate (APPS) suspension fertilizer from merchant-grade wet-process phosphoric acid, 93% sulfuric acid, and anhydrous ammonia. The two acids are simultaneously ammoniated in an ''enlarged'' pipecross reactor; the molten APPS is dissolved in water; and the fluid then is cooled to room temperature in an evaporative cooler. Attapulgite clay is mixed into the APPS fluid to prevent solids from settling during shipment, storage, and use. The process is energy efficient in that the hot APPS fluid provides all the heat required to preheat the phosphoric acid and vaporize the ammonia. Satisfactory suspension grades up to 11-30-0-3S can be made with 50% of the P/sub 2/O/sub 5/ present as polyphosphate. The sulfur present in the product should be useful either to reduce sulfur deficiencies in the soil or to provide maintenance dosages of sulfur. The APPS fluid fertilizer can be either applied directly to the soil or used in preparation of mixed suspension products of various ratios. 9 figs., 1 tab.

• Research Organization: Tennessee Valley Authority, Muscle Shoals, AL (USA). Office of Agricultural and Chemical Development
• OSTI ID: 6071009
• Report Number(s): TVA/PUB-86/17; CONF-840805-33; ON: DE86901141
• Resource Relation: Conference: 188. meeting of the American Chemical Society, Philadelphia, PA, USA, 26 Aug 1984; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM PHOSPHATES
CHEMICAL PREPARATION
AMMONIUM SULFATES
FERTILIZERS
CHEMICAL COMPOSITION
COST
DEMONSTRATION PLANTS
EXPERIMENTAL DATA
PILOT PLANTS
SOLUBILITY
VISCOSITY
AMMONIUM COMPOUNDS
DATA
FUNCTIONAL MODELS
INFORMATION
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
400201* - Chemical & Physicochemical Properties