IMPROVED METHOD FOR CONTINUOUS PRODUCTION OF ALKYL(METH)ACRYLATES WITH MULTIPLE RECYCLING OF CATALYST Russian patent published in 2010 - IPC C07C67/03 B01D1/22 B01D3/10 C07C69/54 B01J21/06 

FIELD: chemistry.

SUBSTANCE: invention relates to an improved method for continuous production of alkyl(meth)acrylates through re-esterification of methyl(meth)acrylate with alcohols having higher boiling point than methanol, and specifically to a method for continuous production of higher esters of (meth)acrylic acid of formula (C)

, where R¹ denotes a hydrogen atom or methyl, and R² denotes a straight, branched or cyclic alkyl or aryl residue with 2-12 carbon atoms, through re-esterification of methyl esters of (meth)acrylic acid of formula (A)

, where R¹ is as described above, with higher alcohols of formula (B) R²OH (B), where R² is as described above, in the presence of a catalyst or mixture of catalysts, in which a vacuum evaporator and/or film-type evaporator is used, designed for processing still residue of the distillation column in order to separate high-boiling components, in which the end product coming from a distillation column for extracting low-boiling components is purified through distillation, with separation of an ester of formula (C) from the said distillation column as an overhead product, and the stillage residue of the vacuum evaporator and/or film-type evaporator is divided into portions and a portion of the stillage residue is fed into the reactor. Owing to special processing technology, a product having quality characteristics not achievable until recently is obtained. Also, extremely high output of the product per unit volume of the reactor, as well a overall output can be provided.

EFFECT: possibility of recycling a homogeneous catalyst and low consumption of auxiliary materials.

16 cl, 5 dwg, 3 ex