Dimethylamine production method
A manufacturing method and technology of dimethylamine, applied in the direction of organic chemical methods, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of increased usage of modifiers, low activity, low production rate, etc.
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Embodiment 1
[0040] In 1000 ml of 2N hydrochloric acid solution, the natural mordenite with a crystallinity of 64% was immersed at 80° C. for 8 hours. After the treatment, it was washed with water, dried at 130° C. for 4 hours, and calcined at 570° C. for 4 hours to obtain H-type mordenite. The Na content at this time was 0.3% by mass. In addition, when the particle size distribution is calculated from the cumulative distribution curve, the catalyst with a particle size of 5 mm or more is 3.8% by mass, and the catalyst with a particle size of 2 mm or less is 1.0% by mass. Using this mordenite catalyst, a reaction for producing dimethylamine from ammonia and methanol was performed. The reaction results at 72 hours after the start of the reaction are as follows.
[0041] Methanol conversion rate: 93.1%
[0042] Monomethylamine selectivity: 27.3%
[0043] Dimethylamine selectivity: 62.9%
[0044] Trimethylamine selectivity: 9.9%
[0045] Reaction rate constant k: 0.21[1 / s]
Embodiment 2
[0047] In 1000 ml of 2N hydrochloric acid solution, 200 g of naturally occurring mordenite with a crystallinity of 57% was dipped at 80° C. for 8 hours. After the treatment, it was washed with water, dried at 130° C. for 4 hours, and calcined at 570° C. for 4 hours to obtain H-type mordenite. The Na content at this time was 0.2% by mass. In addition, when the particle size distribution is obtained from the cumulative distribution curve, the catalyst with a particle size of 5 mm or more is 4.0% by mass, and the catalyst with a particle size of 2 mm or less is 1.3% by mass. Using this mordenite catalyst, a reaction for producing dimethylamine from ammonia and methanol was performed. The reaction results at 72 hours after the start of the reaction are as follows.
[0048] Methanol conversion rate: 92.8%
[0049] Monomethylamine selectivity: 28.3%
[0050] Dimethylamine selectivity: 60.9%
[0051] Trimethylamine selectivity: 10.8%
[0052] Reaction rate constant k: 0.20[1 / s]...
Embodiment 3
[0054] In 1000 ml of 2N hydrochloric acid solution, 200 g of naturally occurring mordenite with a crystallinity of 46% was dipped at 80° C. for 8 hours. After the treatment, it was washed with water, dried at 130° C. for 4 hours, and calcined at 570° C. for 4 hours to obtain H-type mordenite. The Na content at this time was 0.2% by mass. In addition, when the particle size distribution is calculated from the cumulative distribution curve, the catalyst with a particle size of 5 mm or more is 4.1% by mass, and the catalyst with a particle size of 2 mm or less is 1.3% by mass. Using this mordenite catalyst, a reaction for producing dimethylamine from ammonia and methanol was performed. The reaction results at 72 hours after the start of the reaction are as follows.
[0055] Methanol conversion: 92.1%
[0056] Monomethylamine selectivity: 25.9%
[0057] Dimethylamine selectivity: 57.4%
[0058] Trimethylamine selectivity: 16.7%
[0059] Reaction rate constant k: 0.21[1 / s]
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