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
Similar Records
Urea phosphate as granular or fluid fertilizers
Precipitation of impurities in 9-32-0 grade fluid fertilizers
Related Subjects
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
553000 -- Agriculture & Food Technology
60 APPLIED LIFE SCIENCES
AMIDES
CARBONIC ACID DERIVATIVES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DECOMPOSITION
FERTILIZERS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
NATIONAL ORGANIZATIONS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORIC ACID
PHOSPHORUS COMPOUNDS
PURIFICATION
PYROLYSIS
REACTION KINETICS
SYNTHESIS
TENNESSEE VALLEY AUTHORITY
THERMOCHEMICAL PROCESSES
UREA
US ORGANIZATIONS