Method for increasing selectivity of glycollic acid ester
A glycolate and selectivity technology, which is applied in the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problem of low selectivity of glycolate
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Embodiment 1
[0015] Weigh 500 grams of a silicon oxide carrier with a specific surface area of 400 square meters per gram, and configure the catalyst according to the content of 35 parts of active copper oxide. After soaking in the solution for 24 hours, vacuum-dry at room temperature for 12 hours to obtain a solid. The solid was then dried at 120°C for 12 hours and calcined at 450°C for 4 hours to obtain the desired CuO / SiO 2 catalyst.
[0016] Weigh the prepared CuO / SiO 2 200 grams of catalyst is loaded into a tubular reactor with a diameter of 24 mm, using dimethyl oxalate as a raw material, at a reaction temperature of 180 ° C, and a weight space velocity of 0.4 hours -1 , the hydrogen / ester molar ratio is 60: 1, and the reaction pressure is under the condition of 3.0MPa, the raw material is contacted with the copper-containing oxide catalyst to react, and the reaction result is: the conversion rate of dimethyl oxalate is 82%, methyl glycolate The selectivity to ester was 86.4%. ...
Embodiment 2
[0018] The copper-containing oxide catalyst prepared according to the various steps and conditions of [Example 1] has 28 parts by weight of the copper oxide component.
[0019] Weigh the prepared CuO / SiO 2 200 grams of catalyst is loaded into a tubular reactor with a diameter of 24 mm, using dimethyl oxalate as a raw material, at a reaction temperature of 140 ° C, and a weight space velocity of 0.8 hours -1 , the hydrogen / ester molar ratio is 50:1, and the reaction pressure is under the condition of 5.0MPa, the raw material is contacted with the copper-containing oxide catalyst to react, and the reaction result is: the conversion rate of dimethyl oxalate is 80.1%, and the conversion rate of glycolic acid ester is 80.1%. The selectivity is 82.3%.
Embodiment 3
[0021] The copper-containing oxide catalyst prepared according to the various steps and conditions of [Example 1] has 25 parts by weight of the copper oxide component.
[0022] Weigh the prepared CuO / SiO 2 200 grams of catalyst is loaded into a tubular reactor with a diameter of 24 mm, using dimethyl oxalate as a raw material, at a reaction temperature of 190 ° C, and a weight space velocity of 0.5 hours -1 , the hydrogen / ester molar ratio is 60:1, and the reaction pressure is under the condition of 4.0MPa, the raw material is contacted with the copper-containing oxide catalyst to react, and the reaction result is: the conversion rate of dimethyl oxalate is 90.8%, and the conversion rate of glycolic acid ester The selectivity is 91.8%.
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