A kind of method and device for preparing water-soluble ammonium polyphosphate from wet-process phosphoric acid
A wet-process phosphoric acid and water-soluble polymer technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of restricting the production and manufacturing of ammonium polyphosphate, high impurity content of phosphoric acid, and easy formation of internal scale, etc., to achieve reduction The risk of equipment fouling and clogging, high nutrient content, and good water solubility
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0030] Use wet-process phosphoric acid with a mass concentration of 75% as raw material, put it into the tank reactor through a slurry metering pump and heat it to 150°C, concentrate at normal pressure for 2 hours, and mix it with ammonia with a mass concentration of 1% ammonia-water vapor mixture Partial ammonification to get phosphoric acid mass concentration of 85% polyphosphoric acid and phosphate as a mass concentration of 7% of the mixture of monoammonium phosphate and diammonium phosphate slurry. The concentrated slurry is pumped into the graphite tube reactor, and the ammonia ratio from the ammonia station preheated to 200°C is n (phosphoric acid): n (ammonia) = 1:1 for polymerization. The polymerization temperature is 250° C., the polymerization pressure is 0.08 MPa, and the slurry polymerization time is 20 minutes. The polymerized slurry is pumped into the aging evaporation tank, aged at 120°C for 2 hours to remove the water and free ammonia in the system, and the fr...
Embodiment 2
[0033] Using wet-process phosphoric acid with a mass concentration of 77% as raw material, put it into the tank reactor through a slurry metering pump and heat it to 140°C, concentrate at normal pressure for 1 hour, and mix it with ammonia-water vapor mixture with a mass concentration of 1.5% Partial ammonification to obtain a mass concentration of 86% (based on phosphoric acid) polyphosphoric acid and phosphate as a mass concentration of 8% of the mixture of monoammonium phosphate and diammonium phosphate slurry. The concentrated slurry is pumped into a carbon fiber-lined stainless steel tubular reactor, and the gas ammonia from the ammonia station preheated to 200 ° C is carried out at an acid ratio of n (phosphoric acid): n (gas ammonia) = 1:1 Polymerization. The polymerization temperature is 240° C., the polymerization pressure is 0.1 MPa, and the slurry polymerization time is 30 minutes. The polymerized slurry is pumped into the aging evaporation tank, aged at 130°C for ...
Embodiment 3
[0036] Use wet-process phosphoric acid with a mass concentration of 75% as raw material, put it into the tank reactor through a slurry metering pump and heat it to 130°C, concentrate at normal pressure for 1 hour, and mix it with ammonia-water vapor mixture with a mass concentration of 3% Partial ammonification to obtain a mass concentration of 88% (based on phosphoric acid) polyphosphoric acid and phosphate as a mass concentration of 10% of the mixture of monoammonium phosphate and diammonium phosphate slurry. The concentrated slurry is pumped into a carbon fiber-lined stainless steel tubular reactor, and the gas ammonia from the ammonia station preheated to 220 ° C is carried out at an acid ratio of n (phosphoric acid): n (gas ammonia) = 0.9:1 Polymerization. The polymerization temperature is 260° C., the polymerization pressure is 0.02 MPa, and the slurry polymerization time is 5 minutes. The polymerized slurry is pumped into the aging evaporation tank, aged at 140°C for 3...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More