METHODS OF OBTAINING ACETIC ACID Russian patent published in 2014 - IPC C07C51/12 B01J23/46 C07C51/42 C07C53/08 C07C51/44 

FIELD: chemistry.

SUBSTANCE: method includes the following stages: a) bringing methanol and/or its reaction-capable derivative and carbon momoxide into first reaction zone, containing liquid reaction composition, which includes carbonylation catalyst, optionally, promoter of carbonylation catalyst, methyl iodide, methyl acetate, acetic acid and water; b) removal of, at least, part of liquid reaction composition together with dissolved and caught carbon monoxide and other gases from first reaction zone; c) supply of, at least, part of removed liquid reaction composition into second reaction zone, in which, at least, part of dissolved and/or caught carbon monoxide is consumed; d) supply of, at least, part of liquid reaction composition from second reaction zone into zone of evaporative separation with formation of: vapour fraction, which includes acetic acid, methyl iodide, methyl acetate and low-pressure waste gas, including carbon monoxide; and liquid fraction, which includes carbonylation catalyst and, optionally, carbonylation catalyst promoter; e) supply of vapour fraction from zone of evaporative separation into one or more distillation zones for removal of final acetic acid, with temperature of liquid reaction composition, removed from first reaction zone, constituting from 170 to 195°C; and temperature of liquid reaction composition, supplied from second reaction zone into zone of evaporative separation, is, at least, 8°C higher than temperature of liquid reaction composition, removed from first reaction zone.

EFFECT: improvement of method of acetic acid obtaining with improved output.

21 cl, 1 dwg, 1 tbl, 5 ex