Potassium permanganate electrolyte evaporation concentration system

Abstract

The invention discloses a potassium permanganate electrolytic feed solution evaporation concentration system, comprising: a raw material tank; a tubular heat exchanger; a falling film heat exchanger, the lower part of which is provided with a falling film separator; forced circulation Heat exchanger; crystallization separator; MVR compression system, the MVR compression system includes a scrubber and a non-condensable gas pipe, the gaseous outlet of the scrubber is connected to a first centrifugal compressor, and the steam outlet of the first centrifugal compressor is connected to A second centrifugal compressor is provided, the steam outlet of the second centrifugal compressor is connected with a third centrifugal compressor, and the steam outlet of the second centrifugal compressor is also connected with a fresh steam pipe; the falling film heat exchanger The steam inlet is connected to the steam outlet of the second centrifugal compressor, the steam inlet of the forced circulation heat exchanger is connected to the steam outlet of the third centrifugal compressor, the non-condensable gas outlet of the falling film separator and the non-condensable gas of the forced circulation heat exchanger The gas outlets are all connected with non-condensable gas pipes; distilled water system.

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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