Method for preparing piperidine and piperidine derivative
A technology for derivatives, piperidine, which is applied in the field of hydrogenation to prepare piperidine and piperidine derivatives, can solve the problem of high price of raw material pyridine, improve selectivity and production capacity, increase processing capacity, and reduce preheating and cooling. Effect
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Embodiment 1
[0018] The catalyst used is Pd-Ru / Al 2 o 3 . Catalyst weight composition is: Pd=0.5% and Ru=0.003%, the rest is carrier Al 2 o 3 . The carrier adopts commercial Al 2 o 3 , and the catalyst active component Pd and additive Ru were loaded on the carrier Al by the conventional impregnation method 2 o 3 (Al 2 o 3 The particle size is 20-40 mesh). 5.0 grams (about 8ml) of the catalyst was activated by hydrogen before the reaction, and the activation conditions were: GHSV=2500h -1 , Atmospheric pressure, 300°C, reduction time 5 hours. Choose a fixed bed reactor. The reaction temperature is 150°C, the hydrogen pressure is 8.0MPa, pyridine / H 2 The molar ratio is 1:150, and the liquid space velocity of pyridine is 0.5h -1 , H 2 The reaction time is 50 hours (h), and samples are taken for analysis. Samples were analyzed by gas chromatography, HP-15 capillary column, and FID detector.
Embodiment 2
[0020] The liquid space velocity of ethanolamine is 0.35h -1 , other conditions are identical with embodiment 1.
Embodiment 3
[0022] The liquid space velocity of ethanolamine is 0.65h -1 , other conditions are identical with embodiment 1.
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