Production of high-quality liquid fertilizers from wet-process acid via urea phosphate
A pilot-plant process is described that purifies wet-process phosphoric acid for the production of a high-quality urea-ammonium polyphosphate base solution. An intermediate product, crystalline urea phosphate, is produced from urea and merchant-grade (54% P[sub 2]O[sub 5]) wet-process phosphoric acid. The urea phosphate crystals contain only about 15 to 20% of the objectional impurities (iron, aluminum, and magnesium) originally contained in the feed wet-process acid. The urea phosphate crystals are pyrolyzed, converting orthophosphate to polyphosphate with very little energy consumption. The resulting melt is dissolved and neutralized with ammonia to produce 14-29-0 liquid product of high polyphosphate content.
- Research Organization:
- National Fertilizer and Environmental Research Center, Muscle Shoals, AL (United States)
- Sponsoring Organization:
- TVA; Tennessee Valley Authority, Knoxville, TN (United States)
- OSTI ID:
- 7079671
- Report Number(s):
- TVA-Bull-Y-222; ON: DE93003878
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
60 APPLIED LIFE SCIENCES
FERTILIZERS
SYNTHESIS
PHOSPHATES
PYROLYSIS
CHEMICAL REACTION KINETICS
PHOSPHORIC ACID
PURIFICATION
TENNESSEE VALLEY AUTHORITY
UREA
AMIDES
CARBONIC ACID DERIVATIVES
CHEMICAL REACTIONS
DECOMPOSITION
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
US ORGANIZATIONS
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes
553000 - Agriculture & Food Technology