A novel energy saving and exhaust reduction process,characterized by phosphoric acid concentration with the heat recovered from the DAP tail gas exhausted from the pre-neutralization reactor,is proposed for AP production,which results in the energy consumption reduced by 31.

For problems occurred during the production after upgrade of the tube and shell type graphite heat exchanger and axial flow pump equipment of the phosphoric acid concentration system for DAP production,a revamp scheme for parallel use of a new train and an old train of graphite heat exchanger and axial flow pump with different type and size is adopted.

Study on technology for production of IMAP with concentrated phosphoric acid;

Energy saving process and technology for ammonium phosphate production by phosphoric acid pre-concentration;

For the design selection issue of vacuum source for vacuum concentration of wet-process phosphoric acid,some commonly used types and their process flows and operating conditions are outlined,and through comparisons of energy consumption and investment,it is considered that the vacuum source should be selected according to the actual situation.