Selection of materials for acetic anhydride containers and pipelines
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I would like to ask the experts: 1. The process system is a mixture of toluene and acetic anhydride, with a maximum temperature of 115°C. What type of materials are suitable for use in containers and pipes? 2. For aqueous dichloromethane, what type of containers and pipes are suitable?
I’m initially thinking of using 304 as well
Pressure vessels are required, but it is still in the design phase at present
During the planning stage of a new factory, many things need to be explored in depth. In corrosive operating conditions, graphite heat exchangers might be used, right?
No, we use glass heat exchangers
https://bbs.hcbbs.com/thread-2038280-1-1.html Those who are interested in process design should take a look at this post
For the first operating condition, if it is at atmospheric pressure and in a sealed environment~~~ the corrosivity isn’t as strong as expected~~~ What are the specific corrosion conditions (is there any coupling?) ) It is recommended to conduct simulations under the same conditions ； In the second operating condition, where corrosion is minimal – for example, when the water is grade-1 deionized water – carbon steel can be used~~~
Is acetic anhydride the anhydride of acetic acid? Are there chloride and bromide ions? For glacial acetic acid at room temperature, 316L is used. The acetate dehydration tower in my previous company, which operated at around 100 degrees, was made of TA2 and 16MnR composite plates. 304L definitely won’t work here; 2205DSS can be used if the level is below 20 ppm. If the levels of chloride and bromide ions are high, then titanium materials are the only option.
It’s acetic anhydride – it contains no halide ions and no water (the absence of water means there is no acetic acid), so 304 material can be used