Method for preparing glyoxylic acid by oxidizing glyoxal with N2O
A technology of glyoxylic acid and glyoxal, applied in chemical instruments and methods, catalyst activation/preparation, preparation of organic compounds, etc., can solve problems such as pollution and achieve high selectivity
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Embodiment 1
[0027] Preparation of catalyst:
[0028] Catalyst A:
[0029] A certain amount of SAPO-11 molecular sieve was immersed in ferric nitrate solution, in which iron accounted for 0.5% of the mass of the molecular sieve; stirred at room temperature for 6 hours, dried at 110 °C for 9 hours, and then calcined at 400 °C for 4 hours in an air atmosphere to obtain Fe / SAPO-11 molecular sieve;
[0030] Take a certain amount of manganese acetylacetonate and TS-1 molecular sieve (silicon to titanium ratio is 30), the content of manganese element accounts for 3% of the TS-1 molecular sieve, heat the manganese acetylacetonate to sublimation, and the steam after sublimation is mixed with TS-1 molecular sieve. Mn / TS-1 molecular sieve was obtained by reacting at 350℃ for 8h;
[0031] Catalyst A was obtained by mixing Fe / SAPO-11 molecular sieve and Mn / TS-1 molecular sieve in a mass ratio of 4:1.
[0032] Catalyst B:
[0033] A certain amount of SAPO-34 molecular sieve was immersed in a ferri...
Embodiment 2
[0053] 10 g of catalyst A was placed in a fixed bed under N 2 Pretreatment at 300 °C for 2 h in an atmosphere. Glyoxal space velocity is 1.5h -1 , the glyoxal concentration is 10wt%, N 2 The molar ratio of O and glyoxal was 8, and the reaction was carried out under the condition of normal pressure of 200°C. After the reaction was stabilized for 5 h, the product was analyzed by gas chromatography.
Embodiment 3
[0055] 10 g of catalyst B was placed in a fixed bed under N 2 Pretreatment at 300 °C for 2 h in an atmosphere. Glyoxal space velocity is 0.8h -1 , 20% glyoxal concentration, N 2 The molar ratio of O and glyoxal was 18, and the reaction was carried out under the condition of normal pressure of 280°C. After the reaction was stabilized for 5 h, the product was analyzed by gas chromatography.
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