Method for the manufacture of defluorinated phosphatic products

Details Method for the manufacture of defluorinated phosphatic products Method for the manufacture of defluorinated phosphatic products

1980-07-17

1982-04-13

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423264, 423308, C01B 2516

Patent

active

043247741

ABSTRACT:
The present invention relates to a method for the manufacture of phosphatic products having a very low fluorine content from wet process phosphoric acid.
According to the invention the fluorine in the wet process phosphoric acid is removed in the form of potassium fluosilicate, by the reaction of its fluoride components with KH.sub.2 PO.sub.4 formed insitu from KCl or K.sub.2 SO.sub.4 and an amine phosphate salt, the latter resulting from phosphoric acid and an amine selected from the group consisting of a primary--secondary--or tertiary aliphatic amine, a quaternary ammonium base or mixtures thereof. Examples of suitable amines and quaternary ammonium bases are: tri-n-octylamine, ethyl di-n-octylamine, di-n-dodecylamine, di-n-decylamine, tricaprylamine, tri-iso-octylamine etc. The amine constituent appears in the form of a water-immiscible liquid, preferably in conjunction with an organic solvent in which the aliphatic amines and their salts are soluble.
The method is very flexible and enables the production of a range of upgraded phosphatic products of different purity grades according to the specific requirement, at yields which are substantially theoretical.

REFERENCES:
patent: 3328118 (1967-06-01), Sasakura
patent: 3661513 (1972-05-01), Barker
patent: 4160657 (1979-07-01), Drechsel
Slack, Phosphoric Acid, vol. 1, Part I, (1968), Marcel Dekker, Inc., New York, pp. 48-50.
Kirk-Othmer, Encyclopedia of Chemical Technology, Second Edition, vol. 15, copyright 1968 by John Wily & Sons, Inc., pp. 239 and 240.

Affiliated with

Also associated with

Rating

Method for the manufacture of defluorinated phosphatic products does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the manufacture of defluorinated phosphatic products, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the manufacture of defluorinated phosphatic products will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1417274