PROCESS FOR ACETIC ACID PRODUCTION Russian patent published in 2016 - IPC C07C51/235 C07C51/50 C07C53/08 C07C51/12 C07C51/42 C07C51/48 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining acetic acid, which includes stages: (a) methanol carbonylation in presence of catalyst in reaction zone with obtaining reaction mixture (A), which contains acetic acid, methylacetate, methyliodide, catalyst and water; (b) separation of , at least, part of reaction mixture (A) in stripping zone to obtain catalyst-containing liquid flow (BL) and steam flow (BV), which contains acetic acid, methylacetate, methyliodide and water, and output of steam flow (BV) from stripping zone; (c) separation of steam flow in fractioning zone to obtain product flow (CP), which contains acetic acid and insignificant quantity of water, and main distillate (CO), which contains acetic acid, methylacetate, methyliodide and water; (d) condensation of main distillate (CO) and formation of liquid mixture (D) with content of water not higher than 10 wt %, content of acetic acid, at least, 10 wt %, which also contains methyliodide, at least 20 wt %, and methylacetate, at least, 5 wt %, (e) separation of liquid mixture (D) in separation zone to obtain acetic acid and water of light water phase (DA) and heavy organic phase (DO), which contains methyliodide and methylacetate. Reduction of separation time at reduction of liquid mixture temperature to level from 0 to 35°C is realized, and at correction of weight ratio of methyliodide to methylacetate to weight ratio of methyliodide and methylacetate, at least, 1.5:1. Invention also relates to acceleration of separation of liquid mixture phases, which contains, at least, 10 wt % of acetic acid, at least 5 wt % of methylacetate, at least, 20 wt % of methyliodide and not more than 10 wt % of water, where said acceleration is realised due to the following stages: (a) reduction of temperate of liquid mixture to level from 0 to 35°C and (b) correction of weight ratio of methyliodide to methylacetate in liquid mixture to weight ratio of methyliodide to methylacetate, at least, 1.5:1.

EFFECT: expenditure reduction.

18 cl, 3 dwg