METHOD AND INSTALLATION FOR MONOMER PURIFICATION Russian patent published in 2014 - IPC C07C67/54 C07C69/54 C07C51/573 C07C57/04 B01D3/12 B01D3/42 B01D1/00 B01D1/08 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of purifying (meth)acrylates, methacrylic acid anhydrides or acrylic acid anhydrides as monomers, in which, at least, part of monomers, contained in the initial composition, is evaporated and then condensed. At least, part of the initial composition is evaporated in short-path evaporator, with density of mass flow of flash steam $$\dot{m}$$ being selected in accordance with ratio (I), in which $$\tilde{M}$$ stands for average molecular weight of flash steam in short-passage evaporator, kg/kmol; T stands for temperature of evaporations, K; p_i stands for pressure in short-path evaporator, mbar; $$\dot{m}$$ stands for density of mass flow of evaporations, kg/m²·h); components with low boiling point are discharged before said evaporation and condensation of present in the initial composition monomers from it by evaporation in short-path evaporator.

EFFECT: method makes it possible to purify, in particular, high-boiling monomers in simple and reliable way

$$\dot{m}\le 1800\frac{kg\cdot \sqrt{K}}{mbar\cdot m^2\cdot h\cdot \sqrt{\frac{kg}{kmol}}}\cdot p_i\cdot {\left(\frac{\tilde{M}}{T}\right)}^{\mathrm{0,5}}.\left(1\right)$$

13 cl, 3 ex