METHOD OF METHANOL RECUPERATION Russian patent published in 2010 - IPC C07C29/74 C07C31/04 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of methanol recuperation from mixtures which contain it and water. Method lies in the following: a) carried out is multi-step evaporation in at least two steps of evaporation, each of which includes evaporator, with consecutive reduction of pressure with transition from each previous step of evaporation to each further step of evaporation and with heating of evaporators of second step of evaporation and each further step of evaporation with vapour-like main product from corresponding previous step of evaporation, and also b) carried out is multi-step distillation in at least two steps of distillation, in each of which distillation column and evaporator are included, with supply into each following distillation step of bottom product from corresponding previous distillation step and with consecutive pressure increase with transition from each previous distillation step to further distillation step, as well as with heating of evaporator at each distillation step, excluding last distillation step, with vapour-like main product from distillation column corresponding to following distillation step, obtained during evaporation at last step of multi-step evaporation (a) product is supplied for distillation into first step of multi-step distillation (b).

EFFECT: method allows to reduce consumption of energy used for methanol recuperation.

8 cl, 1 dwg, 1 ex