Method for producing isopropanolamine and 1, 2-propane diamine by cracking 2, 6-dimethyl piperazine

[0043] The method for producing isopropanolamine and 1,2-propylenediamine by cracking 2,6-dimethylpiperazine described in Example 1 consists of the following steps:

[0044] (1) Pass 2,6-dimethylpiperazine into the vaporizer of the reaction system, heat and vaporize the mixed gas of ammonia and water, and then mix with Co-Mo-Pd / Al in the reactor 2 o 3 The catalyst carries out the contact cracking reaction;

[0045] (2) After condensing the reaction product obtained in step (1), enter the distillation separation system to obtain pure isopropanolamine and 1,2-propanediamine.

[0046] in:

[0047] The Co-Mo-Pd / Al 2 o 3 For the catalyst, based on the weight of the metal oxide, CoO is 2% of the weight of the catalyst, MoO is 2% of the weight of the catalyst, and PdO is 2% of the weight of the catalyst.

[0048]The Co-Mo-Pd / Al 2 o 3 The catalyst has a pore volume of 0.5ml / g and a specific surface area of ​​280m 2 / g.

[0049] The temperature of the mixed gas of ammon

[0071] The method for producing isopropanolamine and 1,2-propylenediamine by cracking 2,6-dimethylpiperazine described in Example 2 consists of the following steps:

[0072] (1) Pass 2,6-dimethylpiperazine into the vaporizer of the reaction system, heat and vaporize the mixed gas of ammonia and water, and then mix with Co-Mo-Pd / Al in the reactor 2 o 3 The catalyst carries out the contact cracking reaction;

[0073] (2) After condensing the reaction product obtained in step (1), enter the distillation separation system to obtain pure isopropanolamine and 1,2-propanediamine.

[0074] in:

[0075] The Co-Mo-Pd / Al 2 o 3 For the catalyst, based on the weight of the metal oxide, CoO is 3% of the weight of the catalyst, MoO is 2% of the weight of the catalyst, and PdO is 3% of the weight of the catalyst.

[0076] The Co-Mo-Pd / Al 2 o 3 The catalyst has a pore volume of 0.8ml / g and a specific surface area of ​​350m 2 / g.

[0077] The temperature of the mixed gas of ammo

[0099] The method for producing isopropanolamine and 1,2-propylenediamine by cracking 2,6-dimethylpiperazine described in Example 3 consists of the following steps:

[0100] (1) Pass 2,6-dimethylpiperazine into the vaporizer of the reaction system, heat and vaporize the mixed gas of ammonia and water, and then mix with Co-Mo-Pd / Al in the reactor 2 o 3 The catalyst carries out the contact cracking reaction;

[0101] (2) After condensing the reaction product obtained in step (1), enter the distillation separation system to obtain pure isopropanolamine and 1,2-propanediamine.

[0102] in:

[0103] The Co-Mo-Pd / Al 2 o 3 As for the catalyst, based on the weight of the metal oxide, CoO is 3% of the weight of the catalyst, MoO is 1% of the weight of the catalyst, and PdO is 4% of the weight of the catalyst.

[0104] The Co-Mo-Pd / Al 2 o 3 The catalyst has a pore volume of 0.3ml / g and a specific surface area of ​​200m 2 / g.

[0105] The temperature of the mixed gas of a