Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Polish Journal of Chemical Technology

1 2002

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: trójpolifosforan

Sortuj według:

Ogranicz wyniki do:

Sodium tripolyphosphate and others condensed sodium phosphates production methods

Kowalski Z., Kijkowska R., Pawłowska-Kozińska D., Wzorek Z.

Polish Journal of Chemical Technology

2002

Vol. 4, nr 3

27-33

The paper presents production methods and functions of sodium tripolyphosphate STPP and other phosphates, which can remain a significant activity for chemical industry for the foreseeable future. Raw materials, among them wet-process phosphoric acid (WAPP), for condensed sodium phosphates manufacturing and the STPP production in Poland are discussed. Some effects of ionic impurities, present in WAPP, on the quality of the STPP are considered. Our implemented method allowed replacing part of the expensive thermal phosphoric acid used for STPP production with pre-treated concentrated WAPP. 10,000 tons of pre-treated 75% H3PO4 acid, with sulphate concentration lower than 0.1% of SO4 was produced in 1998. It was used mostly for STPP manufacturing; the waste obtained in the pre-treatment process could be utilised in the feed phosphate production. The use of pre-treated concentrated WAPP results in a decrease of STPP production costs at about 20% (in comparison to the use of thermal phosphoric acid).