METHOD FOR PREPARING METHACRYLIC ACID ESTERS Russian patent published in 2003 - IPC

FIELD: organic chemistry, chemical technology. SUBSTANCE: invention relates to the improved method for preparing methacrylic acid esters, in part, methylmethacrylate by safety method that involves the following stages: (a) selective removal of propadiene from mixture comprising propyne and propadiene, dissolved in polar organic solvent to form concentrated mixture of propyne in solvent; (b) steaming propyne in distillation column from flow steam of concentrated solvent mixture containing propyne to form flow of gaseous propyne; (c) condensation of gaseous propyne flow to form condensed propyne flow; (d) interaction of condensed propyne flow with carbon monoxide and alcohol in the presence of the carbonylation reaction catalyst. Steaming propyne is carried out in distillation column fitted with internal condenser arranged for condensation of part of steam flow for spraying feeding. Method provides continuous process working overcoming shortcomings of the prior art - storage of large amounts of easily combustible fuel. EFFECT: improved preparing method. 8 cl, 2 dwg