C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/114
C01B 17/90 (2006.01) B01D 1/26 (2006.01) C01B 17/88 (2006.01)
Patent
CA 1048737
ABSTRACT It is known to concentrate sulphuric acid utilizing a two step evaporative process. However, such processes are limited to relatively low temperatures which results in a relatively low concentration of sulphuric acid. The present invention provides a higher temperature process which results in a higher degree of concentration of the sulphuric acid. Furthermore, as a higher temperature is used in accordance with the present process it is possible to recover heat used in the second stage of evaporation and thus improve the overall efficiency of the process. Accordingly, the present invention provides a process for concentrating and desalt m g dilute sulphuric acid including two heating steps, which process comprises first heating and concentrating a 10 to 30% dilute sulfuric acid at a pressure of 50 to 150 mm Hg by indirectly counter- currently contacting said acid with steam at a temperature of 100° to 150°C from a second step, removing water vapor from the heated acid and with- drawing up to about 50% concentrated sulfuric acid, further concentrating the acid in a second heating step by directly countercurrently contacting and heating the concentrated acid with a superheated steam at a temperature of 350° to 450°C, separating steam and additional water vapor from the heated acid, said steam being used in the first heating step, withdrawing acid of a higher and up to about 80% concentration, cooling said acid to crystallize salts therefrom, separating the salts and recovering the more highly concentrated sulfuric acid.
211770
Bodenbenner Kurt
Muller Gerhard
Muller Heinrich
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