Process and apparatus for concentrating a liquid which...

Details Process and apparatus for concentrating a liquid which... Process and apparatus for concentrating a liquid which...

C - Chemistry, Metallurgy

01

B

23/116, 23/387

C01B 17/88 (2006.01) B01D 1/26 (2006.01) C01G 23/053 (2006.01)

Patent

CA 2024547

-16- ABSTRACT Two heated processing stages and a flashing stage for obtaining the final concentration are used to concentrate a salt-containing dilute sul- furic acid. The first processing stage consists of evaporating means which comprise a circuit for ciru- lating a liquid, an indirect heat exchanger and an evaporating vessel. The second processing stage con- sists of one or two of such evaporating means. The li- quid to be processed is first fed to the first heated processing stage, in which the highest temperatures are between 50 and 70 °C. The highest temperatures in the second processing stage are between 130 to 160 °C. The second processing steam is heated with live steam and the first processing stage with vapors from the second stage. The liquid which is withdrawn from the flashing zone has an H2SO4 concentration from 60 to 80 % by weight, calculated without solids.

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