Is it appropriate to use MVR to concentrate 15% dilute sulfuric acid to 35%?
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The unit installed a new device, and the 15% dilute sulfuric acid (less than 60°C, 20m3/h, containing a small amount of bromine) produced in the process needs to be concentrated to 35% and then recycled. I consulted the manufacturer and said to use MVR, but there are no similar engineering examples. I am also worried about the reliability of the high-speed centrifugal compressor and I don’t know whether the titanium impeller can resist corrosion. Does anyone know of any companies or manufacturers with actual application cases? Cooperation is also possible
This post was last edited by caojiapei on 2017-1-17 13:28. What technical route is more appropriate? The manufacturer says that MVR has low steam consumption and low overall operating costs.
In the case of MVR, will the secondary steam corrode the MVR's high-speed centrifuge impeller?
It is not difficult to increase the acid concentration to 35% (provided that a suitable concentration process is selected).
Titanium should be able to withstand it, and sulfuric acid should not evaporate. A falling film evaporator should be used.
However, sulfuric acid is an acid with a high boiling point. As the concentration increases, the boiling point rises. At a concentration of 5%, its boiling point is 101 ℃； The concentration is 50% and its boiling point is 124°C. Using MVR, the temperature rise of the compressor is very high and the operating power is high.
It is feasible to concentrate the acid to 35% with this concentration. I have done it at a dye intermediate manufacturer.
There are some problems with using titanium for heat exchangers. It is best to use graphite. The waste acid MVR we are using now is a heat exchanger made of graphite. The acid concentration is concentrated from 12% to 50%.
Definitely use a diffusion dialysis membrane stack for concentration, forget about evaporation.