METHOD OF PRODUCING FORMALIN (VERSIONS) Russian patent published in 2024 - IPC C07C47/45 C07C47/58 

FIELD: chemical industry.

SUBSTANCE: group of inventions relates to production of technical formalin. Method of producing formalin (versions) involves loading water, loading methanol, heating the obtained water-alcohol mixture and is characterized by that with respect to the total amount of the loaded components, water is charged in amount of 53.6–57.1 wt.%, methanol is loaded in amount of 4.1–5.6 wt.%, heating of the obtained water-alcohol mixture is carried out to temperature of 70 °C while stirring. Then paraformaldehyde is loaded in amount of 38.7–38.8 wt.%, obtained mixture is heated to temperature of 80–85 °C and held for 3–5 hours at temperature of 80–85 °C.

EFFECT: simplification and acceleration of the technological process while ensuring high quality of the obtained target product.

2 cl, 6 ex