Can acidic liquids be evaporated and concentrated using MVR?
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I have a material at moderate temperature (50–60 degrees Celsius) containing 20% phosphoric acid and 10% sulfuric acid, and it needs to be evaporated and concentrated to half its volume. I was wondering if MVR can be used for this purpose Can steam (theoretically, steam should not contain phosphoric acid or sulfuric acid, but droplets may carry small amounts of these) corrode steam compressors? Stainless steel ones should work, I guess.
Spumes don’t reach the compressor; they are separated in the separator. There is a device called a cyclone separator that can remove spumes. It’s feasible, but it’s necessary to check the relevant data and determine what materials to use. Look for other solutions as well; if concentration is to be used, we can provide some suggestions
Since the material has been diluted by adding water, we want to remove the water and concentrate it back to its original concentration. The current idea is vacuum concentration, but considering energy consumption and the lack of a steam source on site, I am thinking of using MVR or heat pumps as heat sources to concentrate the wastewater. I’m not sure what suggestions there are. Thank you in advance.
Even with MVR, a steam source is required; a small amount of steam still needs to be injected when starting up. Heat pumps are used in multi-effect systems, which demand large amounts of steam. The investment cost for MVR is high, but its operating cost is low – it depends on your investment decisions. In any case, a steam source is essential
Since it is vacuum evaporation, the evaporation temperature of the material is relatively low; therefore, a heat pump is used as the heat source. However, as it is an acidic solution, choosing an exchanger for multi-effect evaporation (low-pressure multi-effect) presents difficulties, and no suitable option has been found yet. Would a C-276 plate heat exchanger work? ). So I want to use MVR for concentration.
I still don’t know what your boiling point and boiling point elevation are; those need to be calculated. I’m not sure what kind of test plates would be suitable for this purpose. This is something that the technical department needs to look into by checking the relevant data. If necessary, you can provide some information so that we can discuss it with our technical department. It would be best if there are samples available
Sure, feel free to send me a private message with any design input requirements you have. Samples are available.
1 The acidic liquid can be evaporated and concentrated using MVR; 2 Installing a demister at the top interior can prevent droplets from carrying away the acidic liquid
Acidic liquids can be evaporated using MVR. At the temperatures you mentioned, acid mist vapor can be easily separated from water vapor. As for the steam needed for supplementation, an electric evaporator can be used for vaporization; even the water that is produced through evaporation can be utilized to generate steam.
1. MVR can be applied； 2. Graphite for concentration equipment should work! 3. The specific physical properties need to be determined for the material. You can message me privately.
Yes, PP or fluoroplastic foam catchers can be used in the gas-liquid separation chamber; the grade of the impeller material should be higher, and 2205 duplex steel, which is suitable for MVR systems, should work fine.