For multi-effect evaporation of aluminum sulfate solutions, what material should be chosen for equipment that is resistant to corrosion and high temperatures?

This post was last edited by Wang Genrong on 2015-9-25 at 13:34. An aluminum sulfate solution is an acidic medium, so there should be no problem using impregnated graphite material; the corrosion rate is 0. Graphite material is commonly used in various acidic media (except for some strongly oxidizing acids).

Compared to titanium-lined materials, what are the performance in terms of corrosion resistance and high-temperature tolerance, as well as the cost, of 316L?

With graphite, the heat exchange area can’t be that large, right? My material intake and output volumes are quite high, several hundred tons per hour.

This post was last edited by Wang Genrong on 2015-9-25 at 13:40. The size of graphite heat exchangers is determined by the process requirements; those with a size of 3 m2–5 m2 can be manufactured, while larger ones of 300 m2–500 m2 or even larger are also possible to produce.

Graphite is great; it’s best if it’s impregnated with PTFE. Resin-impregnated graphite isn’t as good. PTFE-impregnated graphite is more expensive, so do some research. Does graphite have excellent thermal conductivity? Then go with graphite

DuPont raw material Teflon anti-corrosion coating – resistant to high temperatures, corrosion, and wear. Polytetrafluoroethylene.

The Monel400 alloy exhibits excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid, and their derivatives. It also exhibits better corrosion resistance in seawater than copper-based alloys. Acidic medium: Monel400 is corrosion-resistant in sulfuric acid with concentrations below 85%. Monel400 is one of the very few important materials that can resist hydrofluoric acid. Water corrosion: In most cases of water corrosion, the Monel400 alloy exhibits excellent corrosion resistance; pitting and stress corrosion are also rare occurrences, with a corrosion rate of less than 0.025 mm/year. High-temperature corrosion: The maximum temperature at which Monel400 can operate continuously in air is generally around 600°C; in high-temperature steam, the corrosion rate is less than 0.026 mm/year. Ammonia: Due to its high nickel content, the Monel400 alloy can resist corrosion in anhydrous ammonia and under ammoniation conditions at temperatures below 585°C.

The last edit to this post was made by ._Ｔragedyˊ on 2015-10-8 at 09:00. If everyone recommends graphite, will its cost be too high? As long as it can meet the production needs, that’s fine

So, will the price of graphite be higher? Which is better, 316L or titanium-lined materials? A comparison considering both corrosion resistance and cost.

Graphite heat exchangers have good corrosion resistance, excellent heat transfer performance, and low costs, making them the preferred chemical processing equipment in environments with corrosive conditions. Its price is higher than that of carbon steel and lower than that of copper, and it is roughly the same as the price of stainless steel.