Method for continuous co-production of glycine and hydantoin
A technology of glycine and hydantoin, applied in organic chemistry and other directions, can solve the problems of low-value inorganic salts, high production costs and high prices
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Embodiment 1
[0048] Hydroxyacetonitrile, ammonium bicarbonate, and water are mixed according to the ratio of 1:2:50, and transported by the metering pump to the tubular reactor at 143L / min for synthetic hydantoin reaction. The reaction temperature is 100°C, the pressure is 2.0MPa, The residence time is 20min, and then the feed liquid enters the flash tower to remove all CO 2 , some NH 3 and a small amount of water, 1 / 4 of the obtained synthetic hydantoin reaction liquid enters the evaporator, and the remaining 3 / 4 enters the tank reactor. The reaction liquid that enters the evaporator is evaporated and concentrated to 1 / 3 of the original volume, then enters the acidification reactor, adds 98wt% concentrated sulfuric acid equivalent to 15wt% of the concentrated solution, and reacts for 2 hours at 90°C for acidification (cyclization), and then enters the decolorization reactor 1, add 2wt% activated carbon, decolorize at 90°C for 0.5 hour, then filter, crystallize, centrifuge, and dry to obt...
Embodiment 2
[0050] Hydroxyacetonitrile, ammonium bicarbonate, and water are mixed according to the ratio of 1:3:55, and transported by the metering pump to the tubular reactor at 151L / min for synthetic hydantoin reaction. The reaction temperature is 110°C, the pressure is 2.5MPa, The residence time is 18min, and then the feed liquid enters the flash tower to remove all CO 2 , some NH 3 and a small amount of water, 1 / 4 of the obtained synthetic hydantoin reaction liquid enters the evaporator, and the remaining 3 / 4 enters the tank reactor. The reaction liquid that enters the evaporator is evaporated and concentrated to 1 / 3 of the original volume, then enters the acidification reaction tank, adds 98 wt% concentrated sulfuric acid equivalent to 15 wt% of the concentrated solution, and reacts for 2.5 hours at 90°C for acidification (cyclization), and then enters the decolorization tank 1, add 3wt% activated carbon, decolorize at 90 DEG C for 0.6 hours, then filter, crystallize, centrifuge, an...
Embodiment 3
[0052] Hydroxyacetonitrile, ammonium bicarbonate, and water are mixed according to the ratio of 1:3.5:60, and transported by the metering pump to the tubular reactor at 135L / min for synthetic hydantoin reaction. The reaction temperature is 90°C, the pressure is 2.0MPa, The residence time is 23min, and then the feed liquid enters the flash tower to remove all CO 2 , some NH 3 and a small amount of water, 1 / 2 of the resulting synthetic hydantoin reaction liquid enters the evaporator, and the remaining 1 / 2 enters the tank reactor. The reaction liquid that enters the evaporator is evaporated and concentrated to 1 / 4 of the original volume, then enters the acidification reactor, adds 98wt% concentrated sulfuric acid equivalent to 17wt% of the concentrated solution, and reacts for 3 hours at 90°C for acidification (cyclization), and then enters the decolorization reactor 1, add 2.5wt% activated carbon, decolorize at 90°C for 0.6 hours, then filter, crystallize, centrifuge, and dry t...
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