Catalyst for production of hydroxyacetic acid ester by oxalate through hydrogenation
A technology of glycolate and oxalate, applied in physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, preparation of carboxylate, etc., can solve the problem of low selectivity of glycolate
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Embodiment 1
[0023] Weigh 100 grams of alumina composite carrier with a weight ratio of alumina to silica of 4:1. The catalyst is prepared according to the content of 20 parts Cu, 5 parts Ba and 2 parts Fe. The steps are as follows: select copper nitrate, prepare an impregnation solution according to the Cu loading amount, immerse the silica carrier in the solution for 20 hours, and then vacuum dry for 6 hours Obtained solid I. Select barium nitrate and ferric nitrate, and prepare the impregnation solution according to the load of barium and iron. In order to prevent the hydrolysis of metal ions to form hydroxides or oxide precipitation, a small amount of nitric acid is added to the impregnation solution to make the pH of the impregnation solution = 4-6 , Then the above solid substance I was soaked in the dipping solution for 12 hours, dried into a solid after being fully absorbed, and pulverized to obtain a solid substance II; Add the solid substance II to an appropriate amount of Tianqing...
Embodiment 2
[0026] According to the various steps and conditions of Example 1, except that the carrier of the catalyst is a composite carrier with a weight ratio of alumina and silica of 1:1, and the composition of the catalyst is 21 parts Cu and 4 parts Cu 2 O, 0.5 parts of Zn / SiO 2 , Using dimethyl oxalate as raw material, at a reaction temperature of 170℃, and a weight space velocity of 0.5 hours -1 , The hydrogen / ester molar ratio is 80:1, and the reaction pressure is 2.8MPa. The raw materials are contacted with the catalyst to react to produce an effluent containing methyl glycolate. The reaction result is: the conversion rate of dimethyl oxalate is 82 %, the selectivity of glycolate is 83%.
Embodiment 3
[0028] According to the various steps and conditions of Example 1, except that the carrier of the catalyst is a composite carrier with a weight ratio of alumina and silica of 0.1:1, the composition of the catalyst is 15 parts Cu, 10 parts Cr, and 1 part Cu. 2 O, using dimethyl oxalate as raw material, at a reaction temperature of 150°C, and a weight space velocity of 0.4 hours -1 When the hydrogen / ester molar ratio is 60:1 and the reaction pressure is 1.0 MPa, the conversion rate of dimethyl oxalate is 75%, and the selectivity of methyl glycolate is 73%.
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