초록 ▼

Acrylic acid or methacrylic acid is prepared by vapor-phase catalytic oxidation of acrolein or methacrolein, with molecular oxygen at a temperature of from 240°to 450°C in the presence of a catalyst represented by the formula: Mo12PaMgbQbRcTdOe WHEREIN Mo is molybdenum, P is phosphorus, Mg magnesium

Acrylic acid or methacrylic acid is prepared by vapor-phase catalytic oxidation of acrolein or methacrolein, with molecular oxygen at a temperature of from 240°to 450°C in the presence of a catalyst represented by the formula: Mo12PaMgbQbRcTdOe WHEREIN Mo is molybdenum, P is phosphorus, Mg magnesium, O is oxygen, Q is at least one of calcium, strontium, and barium, R is at least one of potassium, rubidium, cesium and thallium, T is at least one of vanadium, tungsten and nickel, and a, b, c, d, and e are atomic ratios of the respective elements, where a=0.5-6, b=0.2-6, b+b′=0.2-6, b′ranges from 0 to a value determined by the magnesium content of the catalyst and the limits of b+b′, c=0.2-6, d=0-6, and e is a value dependent upon the oxidation state of the catalyst.

대표청구항 ▼

In a process for preparing acrylic acid or methacrylic acid by the vapor-phase catalytic oxidation of the corresponding unsaturated aldehyde with molecular oxygen at a temperature of from 240°C. -450°C., the improvement comprising: reacting said unsaturated aldehyde over a catalyst consisting essent

In a process for preparing acrylic acid or methacrylic acid by the vapor-phase catalytic oxidation of the corresponding unsaturated aldehyde with molecular oxygen at a temperature of from 240°C. -450°C., the improvement comprising: reacting said unsaturated aldehyde over a catalyst consisting essentially of molybdenum, phosphorus, magnesium, element Q, element R, element T and oxygen represented by the formula: Mo12 Pa Mgb QbRc Td Oe wherein Mo is molybdenum, P is phosphorus, Mg is magnesium, O is oxygen, Q is at least one metal selected from the group consisting of calcium, strontium and barium, R is at least one metal selected from the group consisting of potassium, rubidium, cesium and thallium, T is at least one metal Selected from the group consisting of vanadium, tungsten and nickel, a, b, b′, c, d and e are atomic ratios of the respective elements, wherein a =0.5-6, b=0.2-6, b +b′=0.2-6, b′ranges from 0 to a value determined by the magnesium content of the catalyst and the limits of b +b′, c =0.2-6, d =0-6, and e is a value dependent upon the oxidation state of the catalyst.