How to address corrosion issues in metal storage tanks for organic alcohols?
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How to address corrosion issues in metal storage tanks for organic alcohols? We know that alcohols are compounds whose molecules contain hydroxyl groups bonded to carbon atoms on hydrocarbon chains or side chains of benzene rings. Its functional group is -OH (hydroxyl group). Important alcohols include: methanol, ethanol, benzyl alcohol, ethylene glycol, etc. Generally, alcohols are colorless liquids or solids. Monohydric aliphatic alcohols with fewer than 12 carbon atoms are liquids, while those with 12 or more carbon atoms are solids. Polyols such as glycerin are syrupy substances. Monohydric alcohols dissolve in organic solvents, while alcohols with three or fewer carbon atoms dissolve in water. The melting and boiling points of lower alcohols are much higher than those of hydrocarbons with the same number of carbon atoms, due to the presence of hydrogen bonds in alcohol molecules that lead to association. Saturated alcohols cannot decolorize bromine water. When various alcohol liquids with a carbon atom count of less than 12 are stored in metal tanks, these solvents can cause corrosion on the metal surface; not only does this occur with carbon steel, but it also leads to severe corrosion in stainless steel. Therefore, anti-corrosion treatment is applied to the inner walls of these storage tanks. However, what kind of anti-corrosion technology should be used to solve this problem?
To address the corrosion issue of metal storage tanks for organic alcohols, the following anti-corrosion techniques can be employed: 1. Select appropriate materials: Use materials with good corrosion resistance for manufacturing the tanks, such as stainless steel and fiberglass-reinforced plastic. These materials can effectively resist corrosion when in contact with organic alcohol liquids. 2. Corrosion-resistant coating: A corrosion-resistant coating is applied to the surface of the storage tank to provide a protective layer that reduces direct contact with organic alcohol liquids. Common anti-corrosion coatings include epoxy resin, polyurethane, etc. 3. Fill with inert gas: Fill the interior of the storage tank with an inert gas, such as nitrogen or argon. This reduces oxygen exposure and lowers the likelihood of corrosion. 4. Regular maintenance inspections: Periodically inspect and maintain the storage tanks to detect and repair any corrosion issues promptly, thereby preventing further corrosion damage. It is necessary to select the appropriate corrosion prevention technology based on specific circumstances, to ensure that the storage tank can effectively resist the corrosion caused by organic alcohol liquids over a long period of use. .
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In practical use, epoxy and furan resin coatings provide poor corrosion protection for metal tanks used for storing alcohols, while phenolic coatings offer slightly better corrosion resistance; however, these coatings are brittle and have a short service life.
Direct PTFE lining for corrosion resistance