Abrégé

The invention relates to a continuous process to make and isolate methylal by reacting formaldehyde and methanol with an acid catalyst under at least partial formation of methylal and water, to form a mixture M2 comprising formaldehyde, methanol, methylal, and water, separating the said mixture M2 in a distillation column B into three distinct product streams, one being a distillate taken from the column head BH which is rich in methylal, one taken from the column bottom stream BB being almost pure water, and one taken from the side of the column B below the reaction zone which stream is rich in methanol, characterised in that the ratio of the amount of substance of methanol to the amount of substance of formaldehyde in the mixture Ml is at least 3 mol/mol, and to an apparatus to be used with this process.

Classes IPC  ?

• C07C 41/56 - Préparation de composés comportant des groupes par des réactions donnant des groupes par condensation d'aldéhydes, de paraformaldéhyde ou de cétones
• C07C 43/30 - Composés comportant des groupes
• C07C 43/303 - Composés comportant des groupes les atomes de carbone de l'acétal étant liés à des atomes de carbone acycliques

Produits et services

(1) Paraformaldehyde.