Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Reexamination Certificate
2006-01-24
2006-01-24
Langel, Wayne A. (Department: 1754)
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
C423S157300
Reexamination Certificate
active
06989136
ABSTRACT:
The invention concerns a method for producing phosphoric acid, which consists in: at least an attack of phosphate ore with an attacking liquid containing soluble phosphate ions, forming of an attacking product, separating in the attacking product between an insoluble solid phase containing impurities and a liquid phase having soluble phosphate ions and calcium ions, introducing in the separated liquid phase an acid stronger than phosphoric acid and which forms, with said calcium ions, a soluble calcium salt, and isolating a solution of said calcium salt, not contaminated by the impurities, thereby obtaining a phosphoric acid solution.
REFERENCES:
patent: 995894 (1911-06-01), Palmaer
patent: 2152364 (1939-03-01), Seyfried
patent: 3323864 (1967-06-01), Lapple
patent: 3387930 (1968-06-01), Schertzer et al.
patent: 3401014 (1968-09-01), Saeman
patent: 3425837 (1969-02-01), Conte et al.
patent: 3556724 (1971-01-01), Fuchs et al.
patent: 3843767 (1974-10-01), Faust et al.
patent: 3988420 (1976-10-01), Loewy et al.
patent: 4088738 (1978-05-01), Hauge
patent: 4108957 (1978-08-01), Michel
patent: 4222990 (1980-09-01), Drechsel
patent: 4387077 (1983-06-01), Weterings et al.
patent: 4393030 (1983-07-01), Sardisco et al.
patent: 4393032 (1983-07-01), Drechsel et al.
patent: 4435370 (1984-03-01), Holcomb et al.
patent: 3438655 (1986-04-01), None
patent: 0087323 (1983-08-01), None
patent: 1082404 (1954-12-01), None
patent: 2343698 (1977-10-01), None
Database Chemabs, Chemical Abstracts Service, Columbus, Ohio, U.S., E. Diaz Nogueira et al., “Wet Process for Manufacture of Phosphoric Acid from Phosphate Rock Using Hydrochloric Acid” from ES 2013211A (Ercros S.A. Spain), Apr. 16, 1990.
Dykema Gossett PLLC
ECOPHOS
Langel Wayne A.
LandOfFree
Method for producing phosphoric acid 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 producing phosphoric acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing phosphoric acid will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3592612