Catalysts for the preparation of amines, synthesis processes and amines
A catalyst and ethylamine technology, which is applied in the catalytic application field of ethanol amination reaction, can solve the problems of difficult microstructure and affect the catalytic efficiency of the catalyst, and achieve the effect of improving the catalytic efficiency and improving the specific surface area.
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Embodiment 1
[0024] A catalyst for the preparation of amines, especially for the preparation of ethylamine by ethanol amination reaction, comprising granular or sintered granular zirconium oxide and an appropriate amount of silicon oxide, it is worth noting that, The particles of zirconium oxide may include individual particles or agglomerates obtained after sintering. The size of the particles is usually uniform, but particles of different sizes will also appear with different precipitations. In this embodiment The zirconium oxide usually refers to zirconium oxide, and its molecular formula is ZrO 2 , the zirconium oxide can be in the form of higher purity, and can also be used in the form of being doped with a part, a small part or a trace of other impurities, and usually does not change or greatly affect its catalytic performance; the zirconium oxide The granular surface of the substance forms a microporous structure generated by the silicon oxide, which refers to silicon dioxide, and i...
Embodiment 2
[0034] A synthesis process for preparing the catalyst described in Example 1 above, comprising the following specific steps: dissolving the above-mentioned appropriate amount of zirconium compound, or an appropriate amount of zirconium compound and transition metal salt in deionized water and stirring dropwise under vigorous stirring Add a precipitating agent, keep the dropping rate at 2-3 drops / second, and carry out precipitation under the action of the precipitating agent. After the dropwise addition, continue to stir for 0.5 hour to fully mix, and leave to stand for 24 hours to obtain a precipitate; the mixed solution obtained after the above precipitation is suction filtered, and the precipitate obtained after the suction filtration is put into an oven for drying, at 100 After drying at ℃ for 24 hours, the dried sample was moved into a muffle furnace and calcined at 600℃ for 6 hours to obtain the final product.
[0035] Further, the zirconium compound is any one or both of...
Embodiment 3
[0052] An amine, including ethylamine or other lower aliphatic amines, is prepared by using the catalyst described in Example 1 above. Further, the lower aliphatic amines also include n-butylamine, and by catalyzing the conversion of n-butanol into n-butylamine, the single-pass conversion rate can be increased to over 45%, and the selectivity can reach 95%.
[0053] Verification example 1
[0054] The following specific steps are used to verify the reaction results of the preparation of amines in the above-mentioned embodiment 3. The specific steps are: the zirconium-based composite metal oxide catalyst obtained in the above-mentioned embodiment 2 is used for the amination reaction of ethanol and n-butanol, and the reaction The pressure is 1.5MPa, the ethanol liquid space velocity is 0.8 / h, the reaction ammonia-alcohol ratio is 6:1, and the reaction temperature is 190°C. The reaction results are shown in Table 3 below:
[0055] table 3
[0056]
[0057] ① The serial numb...
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