METHOD FOR PREPARING MIXTURES OF ORTHO-XYLENE WITH AIR FOR PREPARING PHTHALIC ANHYDRIDE Russian patent published in 2007 - IPC C07D307/89 C07D307/00 

FIELD: chemical technology.

SUBSTANCE: invention relates to an improved method for preparing o-xylene-air mixture used in synthesis of phthalic anhydride. Method involves complete evaporation of o-xylene in vaporizer in the absence of oxygen. Then vapor is superheated in superheater to prevent its condensation followed by mixing with technological air, and this mixture is fed into reactor for synthesis of phthalic anhydride. Method provides the charge value of the parent reaction mixture by o-xylene in the limits from 80 g of o-xylene per 1 nm³ of air to 120 g of o-xylene to 1 nm³ of air.

EFFECT: improved method for preparing mixtures, increased yield of end product.

5 cl, 3 dwg, 1 ex