Methylal is a colorless clear volatile volatile flammable liquid, with chloroform odor and irritation. Dissolved in 3 times the water (20 ℃ water solubility of 32% (mass)). This product is irritating to the mucous membrane, anesthetic effect. Inhalation of vapor can cause nasal and laryngeal stimulation; high concentrations of inhalation dizziness. Damage to the eye, damage sustainable for several days. Long-term skin contact can cause dry skin.
The chromoxanes catalyze the reaction of methanol and formaldehyde in the synthesis column. The generated methylal is distilled from the top of the tower and the temperature of the top of the tower is controlled at 41.5-42 DEG C, and the unreacted methanol is separated from the product for recycling, so that the content of methylal in the content is above 85% can reach 99.9% (Process different). Per ton of product consumption of methanol 1100kg, 37% formaldehyde 1300kg. Products methylal impurities in the main methanol and formaldehyde, when the requirements of higher purity, available alkaline hydrogen peroxide oxidation to remove formaldehyde, sodium metal distillation can remove methanol.