METHOD OF OBTAINING POLYMETHYLOLS Russian patent published in 2014 - IPC C07C29/141 C07C29/80 C07C31/18 C07C45/75 C07C45/82 

FIELD: chemistry.

SUBSTANCE: invention relates to method of recuperation of components of mixture of low-boiling compounds, which is formed in the process of distillation of products of the process of polymethylol synthesis and contains tertiary amine, water, methanol, polymethylol of formula , methylol alkanal of formula , alcohol of formula and alkanal with methylene group, located in α-position to carbonyl group. Recuperation is performed by multi-step distillation of said mixture, which is separated at the first step mainly into water-enriched high-boiling fraction and low-boiling water organic fraction, containing tertiary amine. At the second step of distillation water organic fraction of the first step of distillation is separated into fraction, which mainly contains amine, and the other amine-poor fraction. Tertiary amine is represented by trimethylamine or triethylamine, and boiler temperature at the second step of distillation constitutes 110°C and higher. In formulas (I)-(III) residues R independently on each other represent other methylol group, alkyl group with 1-22 carbon atoms or aryl or arylalkyl group with 6-22 carbon atoms.

EFFECT: method makes it possible to recuperate tertiary amine for its re-use in synthesis of polymetylols and considerably reduce methanol content in it.

15 cl, 4 ex