Does methanol corrode steel?
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This post was last edited by Rush2009 on 2009-9-27 at 10:57. My work involves methanol, and I would like to know whether methanol can cause corrosion of steel, as well as whether it is harmful if it comes into contact with human skin. Could some expert give me an answer? handshake
Pure methanol does not cause corrosion to steel! But skin contact does have an effect!
Methanol at room temperature probably doesn’t have this property. At high temperatures, methanol still has a slight acidity, so it may cause some corrosion
Reply: 1. Methanol has little corrosive effect on steel; its corrosiveness stems mainly from acidic impurities such as formic acid. However, thanks to the use of three-column distillation and proper process control, its corrosive impact on carbon steel can be disregarded. This is why methanol pipelines and storage tanks in industrial applications are usually made of carbon steel. 2. Methanol is considered a moderately harmful substance to the human body; there is no problem as long as it does not enter the body. In daily production, if hands come into contact with methanol, rinsing them promptly with water will prevent any harm to the body.
Methanol has virtually no corrosive effect on steel materials; if there are no requirements for cleanliness in the manufacturing process, ordinary carbon steel (20) seamless pipes can be used； If cleanliness requirements exist in the manufacturing process, seamless stainless steel tubes (0Cr18Ni9) can be used. Prolonged skin contact with liquid methanol can cause a feeling of warmth in the affected area, mild congestion or degreasing, itching, and even dermatitis and eczema.
Methanol is usually stored in carbon steel pipes, and it is certainly harmful to the human body. If it’s crude methanol, touching it with your hands will cause itching on the skin; refined methanol is slightly less harmful, but it’s still best to avoid direct contact with it
One more thing: to what extent does methanol vapor cause corrosion of steel, and what is its impact on human health?
At normal temperature and pressure, methanol has virtually no corrosive effect on steel, not even during the production process. When methanol comes into contact with the skin, it penetrates deep into the subcutaneous tissue, which is harmful to the skin and may also pose a risk to internal organs; therefore, caution is required.
It is of utmost importance that methanol not get into the eyes; if it does, rinse them immediately with saline solution. It’s best to go to the hospital for a check-up.
1; Methanol is a colorless and transparent liquid at room temperature, with a slight alcoholic aroma. Methanol is a neurotoxin that can be absorbed through the respiratory tract, gastrointestinal tract, and skin, and has significant **effects**. Ingesting 5–10 ml can cause severe poisoning; more than 10 ml poses a risk of blindness, while amounts over 30 ml can be fatal. The permitted concentration in the air is 0.05 mg/l. Skin contact leads to methanol poisoning primarily through penetration of the skin into the body; as long as the exposure is not prolonged, there are no wounds on the skin, and the affected area is rinsed thoroughly with water immediately after contact, then there is no serious problem. 2 ； Pure methanol has virtually no corrosive effect on carbon steel, while crude methanol contains methyl formate and ethyl acetate, which are acidic, and thus it is corrosive to carbon steel ； To prevent the trace acids in crude methanol from corroding pipes and equipment, caustic soda is added to the pre-distillation column to raise the pH value ； The acids and bases in methanol are below 30PPM, so it is non-corrosive or essentially non-corrosive. I’m not sure if everyone will be satisfied with my explanation This post was last edited by wamj6566 on 2008-12-15 20:49.]
Methanol is corrosive to pipes. In our pre-tower, after the amount of alkali used decreases, we often clean the filter screens of the reflux pump; from what can be seen after cleaning, it’s steel slag