Method and system for manufacturing ammonium phosphates

Abstract

Abstract AN IMPROVED PLANT AND METHOD FOR MANUFACTURING AMMONIUM PHOSPHATES FROM PHOSPHORIC ACID AND AMMONIA IS DESCRIBED. THE PROCESS COMBINES THE AMMONIA WITH A DILUTED AND SOMEWHAT PRENEUTRALIZED ACID IN A PRIMARY REACTOR, THE PARTIAL PRENTUTRALIZATION BEING DONE IN A SCRUBBER SPRAYING ACID AND WATER ON COLLECTED VAPORS. THIS RECOVERS THE AMMONIA FROM VAPORS GIVEN OFF SUBSESUENTLY IN BOTH THE PRIMARY REACTOR MENTIONED AND A SUBSEQUENT SECONDARY REACTOR. THUS, IMPORTANTLY, THE SCRUBBER, NOT ONLY RECOVERS WASTE AMMONIA, BUT FEEDS IT BACK TO THE SYSTEM AND DELEVERS PRACTICALLY PURIFIED WATER VAPOR TO THE ATMOSPHERE. THE REACTIVETEMPERATURE RISE IN THE PRIMARY REACTOR IS CONTROLLED BY A THERMOSTATICALLY OPERATED WATER SUPPLY VALVE WHICH ADDS COLD WATER IN PROPORTION TO THE NEUTRALIZING ACTIVITY. THE EFFLUENT FROM THE SCRUBBER NOT ONLY IS THE REDUCED STRENGTH ACID BUT ALSO CONTAINS SOME MON-AMMONIUM PHOSPHATE. FROM THE PRIMARY REACTOR A WATER SOLUTION OF DI-AMMONIUM AND MON-AMMONIUM PHOSPHATES HAVING A DESIRABLE MOL RATIO BETWEEN 1.25 AND 1.45 IS DELIVERED TO THE SECONDARY REACTOR. SELECTED FEED-BACK PATHS ARE ARRANGED WHEREBY THE RESULTING SOLID PRODUCT CAN BE REGENERATED UNTIL ALL IS OF A DESIRED SIZE GRANULE WITH NO WASTE.

Inventors

• 👤 Walter J Sackett Sr
• 👤 Augustus J Sackett Jr

Bibliographic Details