DMF distillation problem
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Our company’s distillation tower for DMF recovery. However, DMF tends to decompose in conditions of acidic or overly alkaline pH. To this end, mild additives are chosen for water removal, but it is unclear whether GaO or GaCO3 is a better choice. Or it could be calcium hydroxide. Since a skilled worker was brought in from afar to carry out the recycling, he simply said that they use lime powder over there. But it is said to be calcium hydroxide. Since we are a pharmaceutical factory, we have clear requirements regarding the materials used for solvent recovery; therefore, it is necessary to know the main components, select the key materials, and establish standards. For this, those who have experience with DMF recovery are needed to provide some guidance
Our factory is a tannery that has used NaOH in its processes. You might think that a high alkalinity level is difficult to control, but the presence of calcium ions leads to scaling, which increases the frequency of high-pressure cleaning – another challenge common in this industry. As for the method of adding NaOH, it can be diluted first in a alkali preparation tank before being added to the raw material tank for neutralization
We haven’t added anything here; it’s just that the heater is severely corroded and needs to be replaced frequently. It is said to be due to formic acid decomposing at high temperatures. I’m not sure what material should be chosen instead
316 stainless steel can be used; generally, calcium carbonate is not added, as the reaction is difficult and involves certain technical challenges
Reply to 3# eric20070104: Using 304 stainless steel will suffice.
304 material won’t work; the corrosion is too severe, with small holes all over the outer wall of the tube. .
Our factory is a tannery; they use NaOH, and the results are quite good! You can give it a try……
Sodium hydroxide can be used; 316 material will work fine
Our company specializes in DMF recovery towers; adding alkali is not an effective solution to your problem. There is now a new process that can address your issue.