Method for preparing glyoxylate by oxidation of glycolic acid ester
A technology of glycolic acid ester and glyoxylic acid ester, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, etc., and can solve the problems of low yield of glyoxylic acid esters
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Embodiment 1
[0034] use figure 1 In the process shown, the mixed gas of oxygen and nitrogen containing 5% oxygen and methyl glycolate are used as raw materials, and the molar ratio of oxygen and glycolate in the raw materials is controlled to be 0.5.
[0035] Among them, the preheater 1 is preheated to 120°C; the condition of the first-stage reactor is 180°C, the contact time of the reaction gas and the catalyst is 2 seconds, and the pressure is 0.12MPa; the condition of the second-stage reactor is 240°C, the reaction gas and the catalyst The contact time is 2 seconds, and the pressure is 0.12MPa; the catalysts are 50% iron oxide and the rest are alumina catalysts.
[0036] The reaction result is: the conversion rate of methyl glycolate is 97%, and the selectivity of methyl glyoxylate is 96.4%.
Embodiment 2
[0038] use figure 1 In the process shown, the mixed gas of oxygen and nitrogen containing 0.5% oxygen and methyl glycolate are used as raw materials, and the molar ratio of oxygen and glycolate in the raw materials is controlled to be 0.25.
[0039] Among them, the preheater 1 is preheated to 150°C; the condition of the first-stage reactor is 180°C, the contact time of the reaction gas and the catalyst is 2 seconds, and the pressure is 0.12MPa; the condition of the second-stage reactor is 330°C, the reaction gas and the catalyst The contact time is 2 seconds, and the pressure is 0.12MPa; the catalysts are 50% iron oxide and the rest are alumina catalysts.
[0040] The reaction result is: the conversion rate of methyl glycolate is 98.1%, and the selectivity of methyl glyoxylate is 95.1%.
Embodiment 3
[0042] use figure 1 In the process shown, the mixed gas of oxygen and nitrogen containing 40% oxygen and methyl glycolate are used as raw materials, and the molar ratio of oxygen and glycolate in the raw materials is controlled to be 0.5.
[0043] Among them, the preheater 1 is preheated to 80°C; the condition of the first-stage reactor is 180°C, the contact time of the reaction gas and the catalyst is 2 seconds, and the pressure is 0.12MPa; the condition of the second-stage reactor is 230°C, the reaction gas and the catalyst The contact time is 2 seconds, and the pressure is 0.12MPa; the catalysts are 50% iron oxide and the rest are alumina catalysts.
[0044] The reaction result is: the conversion rate of methyl glycolate is 96.1%, and the selectivity of methyl glyoxylate is 93.4%.
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