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

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 i...

Full description

Saved in:
Bibliographic Details
Published in:Polish journal of chemical technology 2014-01, Vol.16 (1), p.41-44
Main Authors: Gorazda, Katarzyna, Kowalski, Zygmunt, Kijkowska, Regina, Pawłowska-Kozińska, Danuta, Wzorek, Zbigniew, Banach, Marcin, Nowak, Anna K.
Format: Article
Language:English
Subjects:
Assessments
classic method
dry method
Drying
Economics
Mixers
Phosphoric acid
Roasting
Sodium
Sodium carbonate
sodium tripolyphosphate production
technical and economic analysis
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1509-8117
1899-4741
DOI:10.2478/pjct-2014-0007