REMOVAL OF PERMANGANATE-REDUCING COMPOUNDS FROM CONTINUOUS METHANOL CARBONYLATION PROCESS Russian patent published in 2010 - IPC C07C51/44 C07C51/48 C07C53/08 C07C51/42 

FIELD: explosives.

SUBSTANCE: method is described for reducing amount and/or removing permanganate-reducing compounds for methanol carbonylation process to produce acetic acid, where the method involves a stage for separating the said carbonylation product, resulting in a volatile fraction containing acetic acid, organic iodide, water and at least one permanganate-reducing compound, and a less volatile fraction; distillation of the said volatile fraction, resulting in a purified acetic acid product and a first overhead fraction containing organic iodide, water, acetic acid and at least one permanganate-reducing compound; distillation of at least part of the first overhead fraction in a first distillation apparatus to form a second overhead fraction rich in permanganate-reducing compound; addition of dimethyl ether to the second overhead fraction, extraction of the second overhead fraction with water to form a second overhead extraction stream and a water stream containing at least one permanganate-reducing compound and separation from the water stream, containing at least one permanganate-reducing compound; and returning at least the first part of the extracted second overhead fraction to the said distillation apparatus, method of producing acetic acid and method of separating a mixture obtained during carbonylation of methanol.

EFFECT: more efficient removal of permanganate-reducing compound from a system by returning part of the stream of purified product, reduced loss during waste removal.

34 cl, 2 dwg