Dry single-stage method of sodium tripolyphosphate production – technological and economic assessment

Open access

Abstract

The study presents a technology of sodium tripolyphosphate (STPP) production with the use of a dry, single-stage method. The reacting substrates (concentrated wet-process phosphoric acid - WPPA and solid Na2CO3 ) are mixed with a recycled final product (STPP) in a mixer, then a „quasi-dry” mixture is calcined in a rotary kiln. Thanks to that, some stages of a classic method of STPP production are eliminated: one of the two-stage neutralization of the phosphoric acid with sodium carbonate at temperature ~80°C, filtration of the neutralised solution and its evaporation, as well as the stage of drying a solution of mono- and di-sodium orthophosphate in a spray dryer. According to the presented technical and economical analysis, the costs of STPP production using a single-stage dry method can be 10% lower compared to the classic method.

References

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Polish Journal of Chemical Technology

The Journal of West Pomeranian University of Technology, Szczecin

Journal Information


IMPACT FACTOR 2016: 0.725
5-year IMPACT FACTOR: 0.774

CiteScore 2016: 0.76

SCImago Journal Rank (SJR) 2016: 0.262
Source Normalized Impact per Paper (SNIP) 2016: 0.462

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