Hydantoin precursor solution and method for preparing glycine by using hydantoin precursor solution
A technology of precursor solution and glycine, which is applied in the preparation of cyanide reaction, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problem that it is difficult to fully convert hydantoin into glycine products, and achieve good industrial application promotion value and high yield , the effect of low synthetic energy consumption
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Embodiment 1
[0029] Example 1 (preparation of hydantoin precursor solution, 10min, 80°C)
[0030] 23w% ammonium bicarbonate aqueous solution is pumped into the primary tubular reactor at 33L / min and preheated to 80°C and continues to enter the secondary tubular reactor, 45w% hydroxyacetonitrile material (pH=3, solvent is water) with 5L / min enters the secondary tubular reactor, the temperature of the secondary tubular reactor is controlled at 80°C, the material ratio in the reactor is hydroxyacetonitrile: carbon dioxide: ammonia: water = 1:2:4:39.6, and the reaction stays for 10 minutes. A light yellow hydantoin precursor was obtained at the outlet of the first-stage reactor. According to HPLC analysis, hydantoin amide accounted for 72.54% of the precursor liquid components, hydantoin accounted for 24.23%, and the remaining hydantoinic acid, glycine amide, and glycine accounted for about 3.23% in total.
Embodiment 2
[0031] Example 2 (preparation of hydantoin precursor solution, 5min, 90°C)
[0032] 23w% ammonium bicarbonate aqueous solution is pumped into the primary tubular reactor at 33L / min and preheated to 80°C and continues to enter the secondary tubular reactor, 45w% hydroxyacetonitrile material (pH=5, solvent is water) with 5L / min enters the secondary tubular reactor, the temperature of the secondary tubular reactor is controlled at 90°C, the material ratio in the reactor is hydroxyacetonitrile: carbon dioxide: ammonia: water = 1:2:4:39.6, and the reaction stays for 5 minutes. A light yellow hydantoin precursor solution was obtained at the outlet of the first-stage reactor. According to HPLC analysis, hydantoin amide accounted for 77.54%, hydantoin accounted for 18.42%, and the remaining hydantoinic acid, glycine amide, and glycine accounted for about 4.04% in total.
Embodiment 3
[0035] Example 3 (hydantoin precursor solution, 2min, 100°C)
[0036] 23w% ammonium bicarbonate aqueous solution is pumped into the primary tubular reactor at 33L / min and preheated to 100°C and continues to enter the secondary tubular reactor, 45w% hydroxyacetonitrile material (pH=2, solvent is water) with 5L / min enters the secondary tubular reactor, the temperature of the secondary tubular reactor is controlled at 100°C, the material ratio in the reactor is hydroxyacetonitrile: carbon dioxide: ammonia: water = 1:2:4:39.6, and the reaction stays for 2 minutes. A light yellow hydantoin precursor was obtained at the outlet of the first-stage reactor. According to HPLC analysis, hydantoin amide accounted for 80.54%, hydantoin accounted for 13.79%, and the remaining hydantoin acid, glycine amide, and glycine accounted for about 5.67%.
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