Potassium permanganate electrolyte evaporation concentration system

Abstract

The invention discloses a potassium permanganate electrolyte evaporation concentration system. The potassium permanganate electrolyte evaporation concentration system comprises a raw material tank, atubular heat exchanger, a falling film heat exchanger, a forced circulation heat exchanger, a crystallization separator, an MVR compression system and a distilled water system, wherein the lower partof the falling film heat exchanger is provided with a falling film separator; the MVR compression system comprises a scrubber tower and a noncondensable gas pipe, a gas outlet of the scrubber tower isconnected with a first centrifugal compressor, a steam outlet of the first centrifugal compressor is connected with a second centrifugal compressor, a steam outlet of the second centrifugal compressor is connected with a third centrifugal compressor, and a steam outlet of the second centrifugal compressor is also connected with a fresh steam pipe; and a steam inlet of the falling film heat exchanger is connected with a steam outlet of the second centrifugal compressor, a steam inlet of the forced circulation heat exchanger is connected with a steam outlet of the third centrifugal compressor,and the noncondensable gas outlet of the falling film separator and the noncondensable gas outlet of the forced circulation heat exchanger are connected with the noncondensable gas pipe.

Description

technical field [0001] The invention relates to an evaporation concentration system, in particular to an evaporation concentration system for potassium permanganate electrolytic feed solution. Background technique [0002] Because potassium permanganate is produced and electrolyzed, the mother liquor cooling liquid contains potassium hydroxide, potassium carbonate, potassium permanganate, potassium manganate, potassium chloride, potassium sulfate and other components, the components are relatively complex, and during the evaporation process Disproportionation reaction occurs: 4KOH+4KMnO 4 =4K 2 MnO 4 +2H 2 O+O 2 , a large amount of non-condensable gas is produced during the evaporation process, which seriously affects heat transfer and mass transfer. At the same time, a large amount of non-condensable gas produces a large amount of vapor film, and a slight excess of feed liquid will cause material run-out accidents during operation. Also, a reaction occurs during evapo...

AI Technical Summary

Problems solved by technology

A large amount of potassium manganate and potassium carbonate crystals will be produced during the evaporation and concentration process, which is also not conducive to pumping the material from one evaporator to another

Domestic potassium permanganate production enterprises have tried to use multi-effect evaporation without success or long-term operation. At present, domestic potassium permanganate manufacturers basically use single-effect evaporators to evaporate the electrolytic mother liquor to recover lye

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