Process and installation for concentrating dilute solutions of corrosive products
AssigneeSociete Nationale des Poudres et Expolsifs, Antar Petroles de l'Atlantique: Antargaz
InventorsRoger M. Rat, Francois A. Pollozec, Jean J. Patouillet
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Abstract
Dilute solutions of corrosive products, such as sulphuric or phosphoric acid, are concentrated by pre-concentrating the dilute solution and then introducing the pre-concentrated solution into a tunnel in which it flows in a thin layer over successive cascades while being heated, preferably by indirect radiant heating. An installation for carrying out the process is also described.
Claims19
A process for concentrating a dilute solution of a corrosive product by heating, which comprises the steps of
- 1. pre-concentrating the dilute solution, and
- 2. introducing the pre-concentrated solution into a tunnel in which it flows in a thin layer over successive cascades while being heated whereby the desired final degree of concentration is obtained, and generating the required heat by burning a combustible gas mixture inside a burner material with a high radiating power located sufficiently close to said tunnel in which the solution flows to heat said solution and volatile materials are vaporized while being isolated from the combustion gases.
An apparatus for concentrating a dilute solution of a corrosive product by heating, which comprises
- 1. first means for pre-concentration of said solution
- 2. second means for completing the concentration of the pre-concentrated solution, connected in series with said first means, which second means comprises a tunnel made from a material which is a good conductor of heat and is resistant to corrosion, third means in said tunnel for providing successive cascades over which the said solution can flow in a thin layer, fourth means for heating said solution flowing through said tunnel, said fourth means comprising a row of juxtaposed radiant gas burners made from a refractory material with a high radiating power, means for supplying a combustible gas to said burners;
- said burners being located sufficiently close to said tunnel and said solution so that the heat generated is sufficient to heat and vaporize said pre-concentrated solution by radiation, said burners being associated with means for adjusting the rate of flow of gas therethrough.
Dependencies are inferred from the claim text.