Will formaldehyde crystallize?
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I have a cylindrical tank with a volume of 0.5 cubic meters, used to store 37% formaldehyde. At the bottom is a conical tube, connected using stainless steel fittings; a regular plastic gasket is used in the middle, which is typically used to hold formaldehyde. The problem is that after long-term use, crystals form at the connection points, blocking the pipes. There is no crystallization in the entire tank and pipes; only a large amount of crystallization is present at the flange connections. I wonder if this is related to the plastic gasket Does formaldehyde still form crystals?
Does formaldehyde react with rubber asbestos gaskets? There are still other impurities inside.
When stored at low temperatures or left for an extended period of time, formalin solutions will precipitate white flocculent deposits – polyformaldehyde. The formation of these polymers is related to the concentration of the formalin solution; the higher the concentration, the faster this formation occurs. To prevent the creation of such polymers, certain amounts of methanol or polymerization inhibitors can be added to the formalin solution.
Formaldehyde can polymerize to form polyformaldehyde, especially in cold weather; therefore, it is necessary to add solvents that prevent polymerization, and the formaldehyde manufacturer can be asked to include such solvents
Theoretically, all solutes will crystallize; when a solution reaches saturation, the solute will precipitate and form crystals. Since the solubility of formaldehyde seems to be quite low, crystallization is a normal phenomenon
There are no other magazines inside; it’s just ordinary formaldehyde.
But the question is, why doesn’t crystallization occur in the tank and other areas? Why does it happen only around this joint?
Crystallization occurs in July, and why does polymerization take place at the joints to form crystals? There’s nothing at all in other places
But mine is clearly feces-yellow; the white crystals look more like those around the flange, and the ones in the middle don’t seem to be formaldehyde polymers. Moreover, why is it present only in this connector and not in others?
Type \"formaldehyde\" in the website’s search bar; there are many old posts discussing the same issue – see if that can help you