PROCESSES FOR PURIFYING PHOSPHORIC ACID AND FOR PREPARING PHOSPHORIC ACID

摘要

A PROCESS FOR PURIFYING PHOSPHORIC ACID INCLUDES REMOVING VOLATILE COMPONENTS FROM PHOSPHORIC ACID RICH IN IMPURITIES TO FORM A CRUDE PHOSPHORIC ACID LIQUID SUBSTANTIALLY FREE OF VOLATILE COMPONENTS; HEATING THE CRUDE PHOSPHORIC ACID LIQUID TO A TEMPERATURE ABOVE 2500C IN ORDER TO DECOMPOSE PHOSPHORIC ACID IN THE CRUDE PHOSPHORIC ACID LIQUID AND GENERATE GASEOUS PHOSPHORIC ANHYDRIDE; AND INTRODUCING THE GASEOUS PHOSPHORIC ANHYDRIDE INTO WATER OR A DILUTE PHOSPHORIC ACID AQUEOUS SOLUTION IN ORDER TO HYDRATE THE GASEOUS PHOSPHORIC ANHYDRIDE TO FORM PHOSPHORIC ACID.