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

作者：Gorazda Katarzyna^*; Kowalski Zygmunt; Kijkowska Regina; Pawlowska Kozinska Danuta; Wzorek Zbigniew; Banach Marcin; Nowak Anna K

来源：Polish Journal of Chemical Technology, 2014, 16(1): 41-44.

DOI：10.2478/pjct-2014-0007

• sodium tripolyphosphate production
• dry method
• classic method
• technical and economic analysis

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 similar to 80 degrees C, fi ltration 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.

• 出版日期2014