Two-stage method of obtaining high bulk density sodium tripolyphosphate: Design and mechanism of process

Banach, Marcin; Gorazda, Katarzyna; Pulit, Jolanta

doi:10.1016/j.cherd.2013.10.016

Cited by 3 publications

(2 citation statements)

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“…Vibrational absorption spectra of compounds is characterized by the features inherent in the IR spectra of polyphosphates. In the IR spectrum of Na 5 The IR-spectrum of the isolated compound is inherent in chained polyphosphates with four tetrahedrons PO 4 in the identity period. This conclusion is confirmed by significantly widened bands of asymmetric and symmetric oscillations of PO 2 and РОР groups.…”

Section: Resultsmentioning

confidence: 99%

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Research of the Process for Thermal Dehydration of Orthophosphate is Sodium Phosphate from Central Kyzylkum

Khujamberdiev¹,

Tjprc²

2019

IJCPT

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This research is on the process for high-temperature dehydration of sodium orthophosphates with the ratio Na2 O:P 2 O 5 = 0.73 in pH = 6.3. Temperature parameters for the formation of sodium tripolyphosphates form I and form II using physico-chemical methods are established. It shows the synthesis possibility of sodium tripolyphosphate in the set form. Dried samples of a mixture of 1 mole of dihydrogen phosphate and 2 moles of sodium hydrogen phosphate was prepared and heated for 1 hour at temperatures of 360 to 560 о С. During dehydration at temperature 360°C, only phase II is formed, which is characterized by intense peaks 4,6911, 2,6898, 4,5091, 2,6215, 2,5843, 4,4572, 4,4181, 3,0612 Å. Similar peaks are characteristic in the form I of sodium tripolyphosphates. Difference in the x-ray peaks are 4,6911 and 2,6898 Å. Form II has a maximum value of the peaks at 4,6911 Å, and form I has a maximum value at 2,6902 Å. X-ray of sodium tripolyphosphates form II and form I are almost the same. In IR spectrum Na 5 P 3 O 10 four groups of absorption bands in the intervals 570-750, 890-1015, 1095-1215 and 1255-1285 cm -1 were identified, indicating the long-chain structure of the anion compound. Structure Na 5 P 3 O 10 consists of the continuous P-O-P chains arranged along the cleavage of the fiber, in which each phosphorus atom is in tetrahedral coordination. On derivatograms there are many exo and endoeffective. Endoeffect at 163 and 267 о С corresponds to the formation of Nа 2 H 2 P 2 O 7 . At 163 о С weight loss makes 12.00%, while 267 о С 17,15%. Theoretical losses are 11.96% and 17.1%. Thermo chemical transformations at temperature 300-400°C are accompanied by removal of 0.5 mol water and formation Na 5 P 3 O 10 II. At temperature 450-620°C, reactions transform the form II into form I. At temperature above 620°C sodium hexametaphosphates of amorphous structure is formed. CONCLUSIONSThus, the physic-chemical researches of a mixture of sodium orthophosphates from 2 mole Na 2 HPO 4 and 1 mole NaH 2 PO 4 at the ratio Na 2 O:P 2 O 5 = 0.73, is obtained at pH = 6.3 which is shown as a result of heat treatment of Na 2 H 2 P 2 O 7. The formation occur at temperatures close to 240°C. Na 4 P 2 O 7 occurs at temperatures 270°C and Na 5 P 3 O 10 form II is obtained at temperatures to 400°C and Na 5 P 3 O 10 form I is obtained at temperatures to 620°C. At temperature above 620 о С Na 6 P 6 O 18 is formed. The obtained results are confirmed using x-ray phase and IR -spectroscopy by analysis methods.The obtained results indicate the possibility of the direct synthesis of sodium tripolyphosphates with the necessary operational properties.

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Section: Resultsmentioning

confidence: 99%

“…Sodium tripolyphosphate is an active filler that provides the best characteristics and the minimum influence on environment. For manufacturing of washing-up liquids sodium tripolyphosphate with the required specific volume density, granulometric composition, crystal phase (form I and II) and moisture content [4][5][6] is used.…”

Section: Introductionmentioning

confidence: 99%