Method for preparing 3-aminopropionitrile from waste liquid containing 3,3-iminodipropionitrile
A technology of iminodipropionitrile and aminopropionitrile, applied in the field of preparation of 3-aminopropionitrile, which can solve the problems of high risk, increased environmental treatment costs, waste of resources, etc.
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Embodiment 1
[0018] First take by weighing 40% 3,3-iminodipropionitrile waste liquid 260g and 30% ammoniacal liquor 600g for subsequent use, adjust the reaction pressure of microchannel flow reactor to be 4.0MPa, and reaction temperature is 168 ℃, then by metering pump Ammonia water with a volumetric flow rate of 10ml / min and 40% 3,3-iminodipropionitrile aqueous solution were poured into the microchannel flow reactor at a speed of 1.6ml / min, and reacted for 20min. Distilled to obtain 98.7g of rectified propionitrile, the molar yield was 82.2%.
[0019] GC detection conditions: chromatographic column Agilent DB-624-08, inlet temperature 250°C, carrier gas (nitrogen) flow rate 2ml / min, detector temperature 300°C, column temperature 70-240°C;
[0020] Use GC to sample the product, see figure 1 , the peak position of β-aminopropionitrile is at 5.635min, for figure 1 The analysis results are as follows: the mass content of β-aminopropionitrile in the rectified propionitrile is 98.6%, the mass...
Embodiment 2
[0023] According to the treatment method of Example 1, the difference is that the reaction temperature is 130°C.
[0024] The product was distilled with ammonia water, and then rectified to obtain 56.2 g of rectified propionitrile, with a molar yield of 46.8%.
[0025] The product was sampled and detected by GC, and the results were as follows: the mass content of β-aminopropionitrile in the rectified propionitrile was 98.5%, the mass content of iminodipropionitrile was 0.1%, and the mass content of water was 1.4%.
Embodiment 3
[0027] According to the treatment method of Example 1, the difference is that the ammonia concentration is 33.5%, and the reaction temperature is 175°C.
[0028] The product was distilled with ammonia water, and then rectified to obtain 110.7 g of rectified propionitrile, with a molar yield of 92.0%.
[0029] Using GC to sample and detect the product, the results are as follows: the mass content of β-aminopropionitrile in the rectified propionitrile is 98.4%, the mass content of iminodipropionitrile is 0.1%, and the mass content of water is 1.5%.
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