Why is NaOH added before the distillation of crude methanol?
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Why is NaOH added to crude methanol before it enters the pre-distillation tower?
To promote the decomposition of amines and carbonyl compounds, and to prevent organic acids in the crude alcohol from causing corrosion to the equipment!
Adding an alkaline solution serves to neutralize the acidic substances in crude methanol, preventing acid from corroding the equipment; it can also break down hydroxyl compounds present in crude methanol. Moreover, amine substances contained in crude methanol produced via certain glycol synthesis processes can also be decomposed.
Neutralize the acids in crude methanol
Neutralizing a small amount of organic acid in crude methanol promotes the hydrolysis of carbonyl compounds.
Prevents equipment corrosion, neutralizes free acids, promotes the decomposition of dimethyl ether, and ensures product quality!
Adding an alkaline solution serves to neutralize the acidic substances in crude methanol, thereby preventing acid from corroding the equipment; amine substances are adsorbed using resins, after the purification of methanol through distillation.
The person on the 7th floor said that \"amine substances are adsorbed using resins, and then methamphetamine is distilled.\" May I ask where exactly this takes place? How is it regenerated after the resin becomes saturated?
Adding an alkaline solution serves to neutralize the acidic substances in crude methanol, preventing acid from corroding the equipment. It can also break down hydroxyl compounds present in crude methanol; in the production of dihydroxy methane, it can likewise decompose the amine substances contained in crude methanol.
Neutralize the organic acids in crude methanol, adjust the pH value to 6–7 to prevent equipment corrosion, break down the carbonyl compounds in crude methanol, and facilitate the decomposition of ammonia-based substances
It is not sufficient to neutralize the organic acids in crude methanol by adjusting the pH value to 6–7; generally, to neutralize the organic acids in crude methanol, the pH value should be adjusted to around 8–9.
Since the waste liquid at the bottom of the tower has a high water content, to prevent corrosion, a small amount of alkali is added through a pump in an alkali tank
Prevents organic acid corrosion of equipment, promotes the decomposition of amines and carbonyl compounds, and regulates the pH value of crude alcohols
Neutralizes organic acids to prevent equipment corrosion, promotes the decomposition of amines, and regulates the pH value between 7 and 9
NaOH is added to neutralize the organic acids, adjust the pH value to 8-9, prevent acid corrosion of equipment and process pipelines, and promote the decomposition of amines and carbonyl compounds in crude methanol, so that they can be separated out during the distillation process
1) In methanol production, the process media contain CO2, crude methanol contains organic acids, and the presence of water all contribute to severe corrosion of the equipment and pipelines. Add NaOH to neutralize the organic acids and control the pH at 8–8.5 to protect the equipment from corrosion. 2) Facilitates the decomposition of amines and carbonyl compounds in crude methanol.
It neutralizes organic acids in crude methanol and can also promote the decomposition of amines and carbonyl compounds
The purpose is to neutralize the organic acids in crude methanol to prevent it from corroding the pipes
It primarily serves to neutralize the organic acids in crude methanol, ensuring that the acid value of the final product is within acceptable limits. At the same time, it keeps the methanol solution slightly alkaline, which facilitates the decomposition of organic amines and helps to eliminate any unpleasant odors in the final product. It also serves to prevent acid from corroding the equipment.
Its main function is to regulate the pH value, neutralize organic acids, and prevent corrosion of equipment pipes.
It primarily serves to neutralize the organic acids in crude methanol, ensuring that the acid value of the final methanol product is within acceptable limits. It also keeps the methanol solution slightly alkaline, thereby facilitating the decomposition of organic amines and eliminating any unpleasant odors in the final product. It also serves to prevent acid from corroding the equipment. :handshake