Assertion: phosphoric acid's p | /r/HasProperty | 2 o
Facets:
Source sentences:
text: Typical phosphorylating agents are polyphosphoric acid, POCl 3 , P 2 O 5 , phosphoric acid salts, and water-free H 3 PO 4 in combination with P 2 O 5 .447
text: The cake is washed against the current with hot water, with three passages, which will give a low flow of washing acid between 30 and 40% of P 2 O-
text: It produces phosphoric anhydride (phosphorus pentoxide), which has an empirical formula P 2 O 5 , although an actual molecule has a chemical formula of P 4 O 10 .
text: It produces phosphoric anhydride, which has an empirical formula P 2 O 5 , although an actual molecule has a chemical formula of P 4 O 10 .
text: It produces phosphoric anhydride (phosphorus pentoxide), which has an empirical formula P 2 O 5 , although an actual molecule has a chemical formula of P 4 O 10 .
text: Yet another object of this invention is to provide a process for obtaining phosphoric acid and/or dicalcium phosphate in which the sulfuric acid requirement for its production is very much less than that for the production of an equivalent amount of available P 2 O 5 by other known processes.
text: It is evident that major savings in sulfuric acid consumption would be achieved from production of available P 2 O 5 by Reactions (1) and (2).
text: The combined process of DCP manufacture and phosphoric acid production minimizes any losses of P 2 O 5 normally encountered in the attack on rock phosphate by a mineral acid in the DCP manufacture since, according to the present invention, the reaction system for the manufacture of DCP implies an excess of phosphate rock in which almost the entire P 2 O 5 content is solubilized in step (d).
text: The back end of the kiln has a gaseous product manifold 29 to collect the gaseous product which is discharged through the product at off gas of vent 30 to be treated to recover the product, in this case P 2 O 5 , and a feeder 28 for feeding feed balls into the kiln.
text: It produces phosphoric anhydride (phosphorus pentoxide), which has an empirical formula P 2 O 5 , although an actual molecule has a chemical formula of P 4 O 10 .
text: Thus, it is observed that a change of one variable may favorably affect the recovery of P 2 O 5 from phosphate rock employing one of the wet process methods and it may be detrimental to the recovery of P 2 O 5 employing a different process.
text: It produces phosphoric anhydride which has an empirical formula P 2 O 5 , although an actual molecule has a chemical formula of P 4 O 10 .
text: percent P 2 O 5 , at which concentration the method becomes useful.
text: 4,046,860 discloses a method of defluorinating and concentrating wet process phosphoric acid which comprises the addition of about 2 percent by weight colloidal silica to a fluorine-containing phosphoric acid (28-32 percent P 2 O 5 ), heating under vacuum (50-180 mm Hg absolute) to a temperature of about 190° F., removing the concentrated phosphoric acid stream low in fluorine content, and separately removing a vapor stream containing silicon tetrafluoride (SiF 4 ).
text: Acid solutions comprising at least about 50 wt. percent P 2 O 5 typically are called concentrated acids.
text: Therefore, one may prefer to concentrate the acid to about 40 percent P 2 O 5 by sparging with superheated steam before utilizing the method of the invention.
text: Therefore, it is preferred to introduce at least about a stoichiometric quantity of silica to ensure that the fluoride concentration is reduced to an acceptable level, e.g., to a P/F weight ratio of at least about 100 in concentrated (50-60 wt. percent P 2 O 5 ) acid.
text: (a) mixing the organic solvent with the starting product in a ratio by volume of more than 4:1, preferably 6:1 to 10:1, and thereby effecting in a single process step the extraction--from the crude wet-processed phosphoric acid--of a quantity of phosphoric acid necessary for 40 to 70 weight %, preferably 50 to 55 weight %, of the P 2 O 5 used to go into the organic phase, and for the resulting aqueous phosphoric acid raffinate to contain at most 28-32 weight %, preferably 30-32 weight %, P 2 O 5 , and separating the organic phosphoric acid solution from the phosphoric acid raffinate;
text: The central feature of the present invention is that a method has now been provided by which impurities, especially metal ion impurities, can be precipitated from wet process phosphoric acid at lower N/P 2 O 5 weight ratios than shown effective in prior art processes, at relatively short processing time, and which can be separated from the product phosphoric acid at acceptable rates and P 2 O 5 yields.
text: The combined process of DCP manufacture and phosphoric acid production minimizes any losses of P 2 O 5 normally encountered in the attack on rock phosphate by a mineral acid in the DCP manufacture since, according to the present invention, the reaction system for the manufacture of DCP implies an excess of phosphate rock in which almost the entire P 2 O 5 content is solubilized in step (d).
text: With general circulation back to 35/1, circulation through flash cooler is increased from 35/1 to 40/1, cake remains stabilized at 70 mm, and P 2 O 5 at 0.62%.