METHOD OF RECTIFICATION SEPARATION OF FLUID CONTAINING ACRYLIC ACID Russian patent published in 2010 - IPC C07C51/44 B01D3/14 C07C57/04 

FIELD: process engineering.

SUBSTANCE: invention relates to rectification separation of fluid containing acrylic acid whereat said fluid is fed through loading point to rectification column and mass flow is discharged there through at discharge point arranged above said loading point. Content of acrylic acid in said mass flow in terms of mass flow weight makes ≥90 % by weight and exceeds acrylic acid content in fluid in rectification column zone located at least two theoretical separation stages above said loading point. Content of di-acrylic acid in reflux in terms of reflux weight in at least partial zones, makes ≥550 ppm by weight. Note here that said content of di-acrylic acid in reflux is defined from the presence of Bronsted acid with pKa ≤ 16 in fluid containing acrylic acid, or at least one Bronsted base with pKb ≤ 10, and/or adding to reflux of at least one compound from the group comprising aforesaid Bronsted acid with pKa ≤ 16, Bronsted base with pKa ≤ 10, di-acrylic acid and acrylic acid that contains acrylic acid. That is, mass flow enriched with acrylic acid is discharged from rectification column at the point above loading point while radial polymerisation is inhibited by di-acrylic acid at rectification column top.

EFFECT: efficient separation of fluids.

23 cl, 3 ex