METHOD OF LOWERING FLASH POINT TEMPERATURE OF FIXED CATALYST BED DURING SYNTHESIS OF ACROLEIN OR ACRYLIC ACID OR MIXTURE THEREOF VIA HETEROGENEOUSLY CATALYSED GAS-PHASE PARTIAL OXIDATION Russian patent published in 2011 - IPC C07C45/35 C07C47/22 C07C51/25 C07C51/235 C07C57/05 C07C57/55 C07C51/16 

FIELD: chemistry.

SUBSTANCE: initial mixture 2 of the reaction gas which contains propylene and molecular oxygen, as well as molecular nitrogen and propane as inert gases - diluents, in which molar ratio of molecular oxygen to propylene O₂:C₃H₆≥1, at high temperature is passed through a fixed catalyst bed, the active mass of which is at least one polymetallic oxide containing Mo, Fe and Bi, in which the initial mixture 2 of the reaction gas, per total volume, contains 7-9 vol. % propylene, 9.8-15.5 vol. % molecular oxygen, 10.5-15.5 vol. % propane and 40-60 vol. % molecular nitrogen, provided that the molar ratio V₁ of propane contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.5 and 2.2, molar ratio V₂ of molecular nitrogen contained in the initial mixture 2 of the reaction gas to molecular oxygen contained in the initial mixture 2 of the reaction gas is between 3.5 and 4.5, and molar ratio V₃ of molecular oxygen contained in the initial mixture 2 of the reaction gas to propylene contained in the initial mixture 2 of the reaction gas is between 1.4 and 2.14.

EFFECT: improved method of lowering flash point temperature of a fixed catalyst bed during synthesis of acrolein or acrylic acid or mixture thereof through heterogeneously catalysed gas-phase partial oxidation of propene.

27 cl, 1 dwg, 3 tbl, 3 ex