Catalyst system and method for preparing m-xylylenediamine
A technology of m-xylylenediamine and isophthalonitrile, which is applied in the field of catalytic hydrogenation, can solve the problems of high cost, lack of economic advantages, and difficulty in meeting the needs of long-term operation, and achieves the effect of high-efficiency operation.
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[0075] Example 1
[0076] Fill 10mL of commercially available 30%Co-3%Cr supported catalyst and 40mL of commercially available 35%Ni-5%Fe supported catalyst (both mass fractions) into the middle section of a 100mL fixed bed reaction tube, based on Co catalyst Located on top of Ni-based catalyst. Reducing with hydrogen to activate the catalyst, the reaction temperature is set to 60℃, the reaction pressure is set to 13MPa, the molar ratio of hydrogen to isophthalonitrile is 5:1, and the mass ratio of raw materials is isophthalonitrile:ethanol:liquid ammonia 2:15:10 after mixing at volumetric space velocity 2.5h -1 Pump into the reaction tube to react. The results of the reaction are shown in Table 2.
Example Embodiment
[0077] Example 2
[0078] Load 15mL of commercially available 30%Co-3%Cr supported catalyst and 35mL of commercially available 35%Ni-5%Fe supported catalyst (both mass fractions) into the middle section of a 100mL fixed bed reaction tube, based on Co catalyst Located on top of Ni-based catalyst. Reducing with hydrogen to activate the catalyst, the reaction temperature is set to 80℃, the reaction pressure is set to 12MPa, the molar ratio of hydrogen to isophthalonitrile is 8:1, and the raw materials are based on the mass ratio of isophthalonitrile: tetrahydrofuran: liquid ammonia 1:1:10 after mixing at a volumetric space velocity of 1.5h -1 Pump into the reaction tube to react. The results of the reaction are shown in Table 2.
Example Embodiment
[0079] Example 3
[0080] Fill 20mL of commercially available 30%Co-3%Cr supported catalyst and 30mL of commercially available 35%Ni-5%Fe supported catalyst (both mass fractions) into the middle section of a 100mL fixed bed reaction tube, based on Co. Located on top of Ni-based catalyst. Reducing with hydrogen to activate the catalyst, the reaction temperature is set to 50℃, the reaction pressure is set to 6MPa, the molar ratio of hydrogen to isophthalonitrile is 6:1, and the raw material is based on the mass ratio of isophthalonitrile: tetrahydrofuran: liquid ammonia 2:15:20 after mixing at volumetric space velocity for 1h -1 Pump into the reaction tube to react. The results of the reaction are shown in Table 2.
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