초록 ▼

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 indire

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.

대표청구항 ▼

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

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.