Catalyst for hydrogenation of dimethyl oxalate to ethylene glycol, preparation method and application thereof
A technology of dimethyl oxalate and catalyst, which is applied in the field of catalysts, can solve the problems that the service life of catalysts is difficult to meet industrial applications, high reaction temperature and pressure, high heat and power consumption, and achieve easy industrial production, lower temperature and pressure, and use long life effect
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Embodiment 1
[0030] A kind of preparation method of the catalyst of dimethyl oxalate hydrogenation synthesis ethylene glycol, preparation steps are as follows: (1) take by weighing 9.5g Cu(NO 3 ) 2 ·3H 2 Dissolve O in 100ml of water, add an appropriate amount of nitric acid dropwise to adjust the pH value to 4, then add 7.5g of modified sodalite molecular sieve sieved through 400 mesh, stir evenly, and form a mixed solution A; (2) Weigh 5.2g of urea Add 8.74g of polyvinylpyrrolidone into 100ml of water, stir until dissolved to form a mixed solution B; (3) Add the mixed solution B to the mixed solution A dropwise, stir and mix evenly while adding, the stirring speed is 600r / min, and the dropwise addition is completed Finally, the mixed system was heated to 90°C, the reaction time was 10 hours, and the pH value at the end of the reaction was 7.0; (4) The mixed system after the above reaction was filtered and washed with water until the conductivity was lower than 500 μS / cm, and the obtained...
Embodiment 2
[0033] A kind of preparation method of the catalyst of dimethyl oxalate hydrogenation synthesis ethylene glycol, preparation steps are as follows: (1) take by weighing 11.4g of Cu(NO 3 ) 2 ·3H 2 Dissolve O in 100ml of water, add an appropriate amount of nitric acid dropwise to adjust the pH value to 4.3, then add 7.0g of modified sodalite molecular sieve sieved through 400 mesh, stir evenly, and form a mixed solution A; (2) Weigh 6.8g of urea Add 15.7g of polyvinylpyrrolidone into 100ml of water, stir until dissolved to form a mixed solution B; (3) Add the mixed solution B to the mixed solution A dropwise, stir and mix evenly while adding, the stirring speed is 700r / min, and the dropwise addition is completed Finally, the mixed system was heated to 92°C, the reaction time was 12 hours, and the pH value at the end of the reaction was 7.2; (4) The mixed system after the above reaction was filtered and washed with water until the conductivity was lower than 500 μS / cm. The body ...
Embodiment 3
[0036] A preparation method of a catalyst for hydrogenation of dimethyl oxalate to ethylene glycol, the preparation steps are as follows: (1) Weigh 9.4g of CuCl 2 2H 2 Dissolve O in 100ml of water, add an appropriate amount of nitric acid dropwise to adjust the pH value to 4.8, then add 6.5g of modified sodalite molecular sieve sieved through 400 mesh, stir evenly, and form a mixed solution A; (2) Weigh 8.6g of urea and 24.5g of polyvinylpyrrolidone into 100ml of water, stirred until dissolved to form a mixed solution B; (3) Add the mixed solution B to the mixed solution A dropwise, stir and mix evenly while adding, the stirring speed is 800r / min, and the dropwise addition is completed Finally, the mixed system was heated to 94°C, the reaction time was 14 hours, and the pH value at the end of the reaction was 7.3; (4) The mixed system after the above reaction was filtered and washed with water until the conductivity was lower than 500 μS / cm, and the obtained solid catalyst was...
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