Title:
IMPROVED METHOD FOR MAKING PHOSPHORIC ACID
Document Type and Number:
WIPO Patent Application WO2006016079
Kind Code:
A3
Abstract:
The invention concerns a method for making phosphoric acid comprising, in at least two successive pairs of solid/liquid reactor-separator: in the first reactor, attacking between 60 and 80 % the proportion of tricalcic phosphate with sulphuric acid in a reaction medium, wherein the water is supplied by the whole amount of water for washing the mixture of the slurry from the first reactor and the cake extracted from the second liquid/solid separator; reacting in the second reactor, the complement at 100 % of the proportion of tricalcic phosphate and the amount of sulphuric acid required for the attack, in the presence of all or part of the intermediate phosphoric acid produced and collected by liquid/solid separation of the slurry from the first reactor; finally, by solid/liquid separation of the slurry derived from the second reactor, collecting the final phosphoric acid produced; in parallel, extracting the cake formed on the second separator and dispersing same in the slurry derived from the first reactor before liquid/solid separation.
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Inventors:
NINEUIL GUY (FR)
SIRBA THIERRY (FR)
SIRBA THIERRY (FR)
Application Number:
PCT/FR2005/050451
Publication Date:
August 10, 2006
Filing Date:
June 16, 2005
Export Citation:
Assignee:
VICHEM (FR)
NINEUIL GUY (FR)
SIRBA THIERRY (FR)
NINEUIL GUY (FR)
SIRBA THIERRY (FR)
International Classes:
C01B25/225
Foreign References:
| EP0181029A2 | 1986-05-14 | |||
| FR2468548A1 | 1981-05-08 | |||
| FR2130847A5 | 1972-11-10 | |||
| FR1212825A | 1960-03-25 | |||
| US4220630A | 1980-09-02 |
Other References:
DATABASE CA [online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; BESPALOV, A. V. ET AL: "Manufacture of wet - process phosphoric acid by dihydrate process with separate feed of apatite concentrate", XP002320022, retrieved from STN Database accession no. 133:254491
DATABASE CA [online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; YAKUBOV, R. YA. ET AL: "Effect of seed crystals on the decomposition and crystallization of calcium sulfate dihydrate in production of wet - process phosphoric acid from the phosphorites of Karatau", XP002320023, retrieved from STN Database accession no. 101:57165
DATABASE CA [online] CHEMICAL ABSTRACTS SERVICE, COLUMBUS, OHIO, US; YAKUBOV, R. YA. ET AL: "Effect of seed crystals on the decomposition and crystallization of calcium sulfate dihydrate in production of wet - process phosphoric acid from the phosphorites of Karatau", XP002320023, retrieved from STN Database accession no. 101:57165
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