Semi-batch reactive crystallisation of mono-ammonium phosphate: An experimental study
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NH4H2PO4, mono-ammonium phosphate (MAP) and (NH4)2HPO4, di-ammonium phosphate (DAP) have become leading phosphate fertiliser products worldwide. Ammonium phosphates are produced by reactions of ammonia and phosphoric acid resulting in the formation of the mono-basic, di-basic, or tri-basic salts. Inefficiencies in the MAP/DAP production process are due to the lack of a fundamental understanding of the crystallisation–reaction mechanisms. A semi-batch reactive crystalliser equipped with a cooling jacket, a dual feed system and a turbine type agitator has been used in this study. Effects of N/P ratio, seed crystals, feeding system, feed flow rate, initial supersaturation, feeding time and mixing intensity to the real-time supersaturation, crystal yield, crystal shape (aspect ratio) and final crystal size distribution (CSD) were studied in order to understand the kinetics. This study aims to provide new insights into the MAP/DAP reaction–crystallisation mechanisms.
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Utomo, Johan (2009)This thesis has made two significant contributions to the field of reactive crystallisation. First, new data from batch cooling crystallisation and semi-batch reactive crystallisation experiments of mono-ammonium phosphate ...
Utomo, Johan; Maynard, Nicoleta; Asakuma, Y.; Maeda, K.; Fukui, K.; Tade, Moses (2010)A seeded batch cooling crystalliser in a laboratory setup was utilised to produce mono-ammonium phosphate (NH4H2PO4) crystals. The effects of different initial saturation, seed size and seed loading ratio on crystal size ...
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