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Analysis of sodium tripolyphosphate production processes with a cumulative calculation method

100%
Kowalski Z., Kijkowska R., Gorazda K., Wzorek Z., Nowak A.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 4
22-25
EN
Sodium tripolyphosphate - one of the condensed phosphates is an important ingredient in various types of cleaning substances and a food additive. The paper presents a comparison of different variants of STPP production with the application of the cumulative calculation method. The material balances of the processes were taken as the basis of the analysis. The method of the process analysis as shown in the cumulative calculation determines the influence of the emissions of dust and gas pollutions originating from a particular production process, as well as wastewater and solid wastes resulting from it, upon the natural environment. It was proved that the solution of the production STPP with the dry one-step method has the lowest impact on the environment among the three assessed solutions.
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Dry single-stage method of sodium tripolyphosphate production – technological and economic assessment

86%
Gorazda K., Kowalski Z., Kijkowska R., Pawłowska-Kozińska D., Wzorek Z., Banach M., Nowak A. K.
Polish Journal of Chemical Technology
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2014
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vol. 16
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issue 1
41-44
EN
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.
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