Catalyst for synthesis of 2-and 4-picolines, process for preparing 2- and 4-picoline and process for preparing the catalyst
A technology of picoline and catalyst, which is applied in the field of catalyst composites, can solve the problems of low product yield and environmental pollution, and achieve the effect of simple and economical method and avoiding environmental pollution
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Embodiment 1
[0030] Catalyst preparation: silica gel with a particle size of 6 to 14 meshes is used as a silicon-based carrier (silica support)
[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 homogeneous impregnation, dried in air at 200 to 250°C for 1 hour, then at 400°C for 1 hour, and finally cooled to room temperature in a desiccator. This catalyst is used for the reaction of acetaldehyde and ammonia.
[0032] The experiments were carried out in a downflow glass reactor with an inner diameter of 2 cm and sufficient length to remain inside a 32 cm long furnace. The catalyst formed (10 g) was placed in the middle of the reactor and heated to 380° C. by means of an electric tube furnace. Acetaldehyde was added at a rate of 9.5 ml / hour and ammonia at a rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weighed, and analyzed by gas chro...
Embodiment 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 homogeneous impregnation, dried in air at 225°C for 1 hour, then at 400°C for 1 hour, and finally cooled to room temperature in a desiccator. This catalyst is used for the reaction of acetaldehyde and ammonia.
[0036] The experiments were carried out in a downflow glass reactor with an inner diameter of 2 cm and sufficient length to remain inside a 32 cm long furnace. The catalyst formed (10 g) was placed in the middle of the reactor and heated to 400° C. by means of an electric tube furnace. Acetaldehyde was added at a rate of 9.5 ml / hour and ammonia at a rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weighed, and analyzed by gas chromatography (FID installed w...
Embodiment 3
[0037] Embodiment 3: the preparation of catalyst: particle size is that the silica gel of 6 to 14 mesh is used as silicon-based carrier
[0038] Vanadungstic 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 homogeneous 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. This catalyst is used for the reaction of acetaldehyde and ammonia.
[0039] The experiments were carried out in a downflow glass reactor with an inner diameter of 2 cm and sufficient length to remain inside a 32 cm long furnace. The catalyst formed (10 g) was placed in the middle of the reactor and heated to 370° C. by means of an electric tube furnace. Acetaldehyde was added at a rate of 9.5 ml / hour and ammonia at a rate of 60 ml / minute. The product formed within 2 hours was condensed in an ice-cooled receiver, weighed, and analyzed by gas chromatog...
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