Corrosion resistance of glass-lined reactors
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There is a reaction in which concentrated sulfuric acid is used in the initial stage, followed by strong bases such as sodium methoxide and sodium hydroxide; water is added at the end. The entire reaction proceeds from a strongly acidic environment to a strongly alkaline one. I want to know whether a glass-lined reactor can withstand this
What’s the temperature? You can conduct a small experiment first. Additionally, both concentrated sulfuric acid and sodium hydroxide have strong oxidizing properties; they are strong acids and strong bases. Check online to see if there are materials that can resist strong oxidative corrosion
The temperature isn’t high; at room temperature, the concentration of sodium hydroxide is less than 1%. I’ve checked that sodium methoxide, although it is a strong base, does not cause corrosion to glass-lined surfaces, and the concentration of sodium hydroxide is also within an acceptable range. It’s just unclear whether this type of switching between acids and bases will work
How often should the acid-base balance be changed? I don’t know anything else either
Under normal temperature and pressure, with a stable pH value, and provided that temperature changes are not too frequent, an enamel-lined reactor can be used.
I don’t know. It feels a bit uncertain. Generally, there are few materials that are both acid-resistant and alkali-resistant.
The manufacturer of the glass-lined reactor should provide information on the range of media suitable for using in the equipment.
Glass-lined equipment represents one of the best options for corrosion protection in containers at the current stage; firstly, its price is relatively low, and secondly, it can handle most acids and bases without issues. The most common problem with enamel is chipping. The design institute should provide guidance on which products to choose; do not rely solely on the opinions of a single manufacturer. Thank you
Enameled glass is generally resistant to acids but less so to alkalis, and it is prone to cracking due to large temperature differences between hot and cold environments. Temperature and pressure also need to be taken into account. If at normal temperature and pressure. The long switching cycle is not a big problem
Enameled steel has better acid resistance than alkali resistance. Given the intended use as described by the poster, there will be considerable temperature, pressure, and shear forces, which can cause damage to the enameled surface
1% sodium hydroxide is fine at room temperature. .