Discussion on equipment corrosion during the glyphosate production process
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Our company produces glyphosate using the glycine method. During the production process, the enamel-lined reaction tanks suffer severe damage; in many cases the enamel cracks, requiring frequent repairs due to heavy corrosion. The contents of these tanks consist of 30% salt acid along with synthetic substances such as methanol, dimethyl phosphite, triethylamine, polymethanol, and glycine. Glyphosate is generated by heating this mixture to 115°C. We are considering using a titanium lining for the tanks to address the corrosion issue, but we have not yet implemented this solution. We are not sure if it will work, so we would appreciate any advice from experts and professionals in this field； Please suggest any better methods for corrosion prevention. Using enamel equipment is too troublesome; how can it be modified?
Materials resistant to salt and acid are generally coated with spray-on enamel due to its low cost, but the enamel is prone to damage； Higher-end materials such as titanium are used to manufacture reaction vessels and other equipment, but the price is higher. I hope this helps you.
Recommendation: PTFE spraying for corrosion protection, PFA, imported DuPont polytetrafluoroethylene
30% hydrochloric acid, 115 degrees! ! Be careful with titanium materials. Tetrafluoro is actually a good choice
Our company now uses PTFE-lined kettle lids, which are far superior to those made of enamel; enamel-lined lids only last a few months, and they require frequent repairs
Enameled ones are fine. There’s no problem; the steel-lined F4 has slow heat transfer. It is recommended to replace the imported glaze.
The ceramic tiles often crack during the production process! It might be due to the harsh conditions in your production process, as well as frequent changes in temperature. In fact, better-quality enamel reactors can handle such conditions without any problems. Given that the scale of glyphosate production is quite large, it would be advisable to consider continuous production; this way, the temperature remains stable, avoiding sudden drops or rises in temperature, and the risk of equipment damage is reduced as well! ! !
How long do you use the PTFE reactor lids?
The absence of a PTFE lining results in a low heat transfer rate.