TECHNOLOGY OF INDUSTRIAL SYNTHESIS OF GLYOXAL FROM MONOETHYLENE GLYCOL USING INDUSTRIAL SILVER CATALYST DEPOSITED ON ALUMINOSILICATE, CONTAINING 32-36 WT % SILVER Russian patent published in 2010 - IPC C07C47/127 C07C45/38 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method for synthesis of glyoxal in form of an aqueous solution containing 40 ± 1.5 or 30 ± 0.8 wt % glyoxal which can be used as an emulsifier, bacterial inhibitor, flocculant, preservative, solvent etc. The method involves oxidative dehydrogenation of monoethylene glycol on a domestically produced industrial silver catalyst deposited on aluminosilicate, containing 32-36 wt % silver of the D-53M type, and involves the following successive steps: preparation of a 40-50 wt % aqueous solution of monoethylene glycol on distilled water or steam condensate; preparation of initial reaction mixture by mixing air or nitrogen-air mass, heated in an electrical heater to 260°C or above, and a water-glycol vapour phase obtained in an evaporator and superheated in a "hardening" apparatus using heat of the oxidation reaction mass, taken in respective molar ratios: monoethylene glycol O2=1.0:1.0-1.1; monoethylene glycol: N2=1.0:4.36-7.0; - synthesis of glyoxal in a single- or multiple-shell reactor operating in adiabatic mode, on a catalyst layer at temperature 540-620°C, atmospheric pressure and specific input of ethylene glycol of 1.70-2.3 g/cm³ cat·h; - strengthening of the oxidate (synthesis reaction mass) which is raw glyoxal through vacuum stripping at temperature not above 52°C and residual pressure of 100 mm Hg to obtain commercial grade product containing 40 ± 1.5 or 30 ± 0.8 wt % glyoxal.

EFFECT: proposed method can be used in industrial production.

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