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Method for recycling residual solutions comprising phosphorus and device for such a method

a technology of phosphoric acid and residual solution, which is applied in the direction of phosphorus oxyacids, chemical/physical/physico-chemical processes, chemical apparatus and processes, etc., can solve the problems of inability to use such residual solution in the purification process of phosphoric acid or ppa as described, and achieve the effect of ep2411325 b1

Inactive Publication Date: 2021-05-06
PRAYON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The present invention relates to a process for purifying an aqueous residual solution containing phosphorus molecules and undesirable volatilizable materials. The process involves introducing a feed solution containing phosphorus molecules and a recirculated phosphoric acid solution into a gas-acid contactor, where they are contacted with combustion gases. The resulting solution is then separated from the combustion gases and evaporated to concentrate the phosphorus content and remove the volatilizable impurities. The process provides a purified phosphoric acid solution with a higher phosphorus concentration and lower volatilizable impurity content.

Problems solved by technology

However, the use of such residual solutions in a process for producing purified phosphoric acid or PPA as described in EP2411325 B1 is impossible on account of the presence of undesirable volatilizable compounds in such solutions.

Method used

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  • Method for recycling residual solutions comprising phosphorus and device for such a method
  • Method for recycling residual solutions comprising phosphorus and device for such a method
  • Method for recycling residual solutions comprising phosphorus and device for such a method

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Embodiment Construction

[0079]FIGS. 2 to 5 illustrate the process and nonexhaustive variants of devices for forming said process. Hereinbelow, the term “stream” represented by the letter “F” is used in its commonly accepted interpretation as simply a flow of a fluid. Only FIG. 3 indicates the streams by the letter “F”. The other figures illustrating devices indicate flow rates “Q” corresponding to the streams “F” of FIG. 3. The term “flow rate” represented by the letter “Q” characterizes the mass of the stream per unit time and is expressed in [kg / s] or [kg / h]). The term “flow rate”, even used alone, thus defines a mass flow rate. In order to express the flow rates as a function of the nominal power of the combustion chamber, the mass flow rates of the various streams will be reported hereinbelow in units of [kg / (h MW)], which represents a flow rate per unit of nominal power [MW−1] of the combustion chamber.

[0080]Since the combustion solution P3 derived from the combustion of the mixing solution Pm obtaine...

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Abstract

A method and device for the purification of phosphoric acid contained in a residual solution is provided that includes undesirable volatilizable materials. The residual solution is mixed with a solution of enriched phosphoric acid and is sprayed into a flame of a combustion chamber in order to form a combustion solution P3 of phosphoric acid purified of the undesirable volatilizable materials. The combustion gases resulting from the combustion chamber are contacted with a feed solution in a gas-acid contactor in order to increase the temperature and concentration of P2O5 and thus to form the solution of enriched phosphoric acid. A portion of this solution is conveyed at a flow rate Qp into the combustion chamber. The remainder of the solution is conveyed into a recycle loop in order to be reintroduced into the gas / acid contactor at a flow rate Q2. The ratio of the flow rates, Qp / (Qp+Q2) is controlled at a predefined value.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a process and a device for purifying residual phosphoric acid solutions derived, for example, from industrial or agro-industrial processes and comprising phosphorus in the form of species such as orthophosphate and / or polyphosphate, and also to undesirable volatilizable materials which make their subsequent use difficult, or even impossible. The process of the present invention is particularly efficient and makes it possible to purify residual phosphoric acid solutions of their undesirable volatilizable materials and, where appropriate, to produce phosphoric acid solutions in high concentrations while at the same time limiting the energy consumption required for the production of purified phosphoric acid or polyphosphoric acid solutions. The present invention allows better management of the combustion gases produced by the process before they are discharged into the atmosphere.TECHNOLOGICAL BACKGROUND[0002]Many industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B25/24B01J19/00
CPCC01B25/24B01J2219/00157B01J19/0013C08G79/04B01J8/02B01J19/30B01J10/00B01J19/24B01J19/26B01J6/00
Inventor HEPTIA, BERNARDSZÖCS, CARLLERUTH, DENISGABRIEL, B-
Owner PRAYON SA
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