Catalyst for synthesis of 2-and 4-picolines, process for preparing 2- and 4-picoline and process for preparing the catalyst
A technology for methylpyridine and catalyst, which is applied in the field of preparation of 2-methylpyridine and 4-methylpyridine and catalyst, can solve the problems of low product yield, environmental pollution and the like, achieves simple and economical method, and avoids environmental problems. The effect of pollution
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[0029] Example 1
[0030] Preparation of catalyst: silica gel with a particle size of 6 to 14 mesh is used as a silica support (silicasupport)
[0031] Phosphotungstic acid (10 g) was dissolved in water (25 ml), and the solution was mixed with silica gel (100 g). The slurry was stirred to obtain a uniform impregnation, dried in air at 200 to 250°C for 1 hour, followed by drying at 400°C for 1 hour, and finally cooled to room temperature in a desiccator. The catalyst is used for the reaction of acetaldehyde and ammonia.
[0032] The experiment was carried out in a downflow glass reactor with an inner diameter of 2 cm and a length sufficient to stay in a 32 cm long furnace. The formed catalyst (10 g) was placed in the middle of the reactor and heated to 380°C by means of a tubular electric furnace. Acetaldehyde was added at a feed rate of 9.5 ml / hour and ammonia was added at a feed rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weigh...
Example Embodiment
[0033] Example 2
[0034] Catalyst preparation: silica gel with a particle size of 6 to 14 mesh is used as a silicon-based carrier
[0035] Silicotungstic acid (10 g) was dissolved in water (25 ml), and the solution was mixed with silica gel (100 g). The slurry was stirred to obtain a uniform impregnation, dried in air at 225°C for 1 hour, followed by drying at 400°C for 1 hour, and finally cooled to room temperature in a desiccator. The catalyst is used for the reaction of acetaldehyde and ammonia.
[0036] The experiment was carried out in a downflow glass reactor with an inner diameter of 2 cm and a length sufficient to remain in a 32 cm long furnace. The formed catalyst (10 g) was placed in the middle of the reactor and heated to 400°C by means of a tubular electric furnace. Acetaldehyde was added at a feed rate of 9.5 ml / hour and ammonia was added at a feed rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weighed, and analyzed b...
Example Embodiment
[0037] Example 3: Preparation of catalyst: silica gel with a particle size of 6 to 14 mesh is used as a silicon-based carrier
[0038] Vanadate tungstic acid (10 g) was dissolved in water (25 ml), and the solution was mixed with silica gel (100 g). The slurry was stirred to obtain a uniform impregnation, dried in air at 210°C for 1 hour, then at 400°C for 1 hour, and finally cooled to room temperature in a desiccator. The catalyst is used for the reaction of acetaldehyde and ammonia.
[0039] The experiment was carried out in a downflow glass reactor with an inner diameter of 2 cm and a length sufficient to remain in a 32 cm long furnace. The formed catalyst (10 g) was placed in the middle of the reactor and heated to 370°C by means of a tubular electric furnace. Acetaldehyde was added at a feed rate of 9.5 ml / hour and ammonia was added at a feed rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weighed, and analyzed by gas chromatogr...
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