A kind of method for co-production of biurea and hydroxylamine sulfate
A technology of hydroxylamine sulfate and biuret, applied in chemical instruments and methods, hydroxylamine, nitrogen and non-metallic compounds, etc., can solve the problems of easy thermal decomposition, difficult separation, and difficult comprehensive utilization of hydroxylamine, and achieve the effect of maximizing benefits
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Embodiment 1
[0025] Add 10.5g of nitrourea, 20mL of water, 10mL of sulfuric acid with a concentration of 60% and 0.1g of a Pt / C catalyst with a loading capacity of 5% into the hydrogenation reactor in sequence, and start stirring. Raise the reaction temperature to 20°C and keep the pressure at 0.5Mpa. After the reaction is over, release the pressure, centrifuge and separate the catalyst, neutralize to a sulfuric acid concentration of 10%, and then slowly add sodium cyanate solution dropwise, wherein the sodium cyanate The content was 6.6g, and the resulting white precipitate was filtered, washed, dried and weighed. The filtrate was concentrated and crystallized, and the resulting white crystalline substance was filtered, washed, dried and weighed.
Embodiment 2
[0027] Add 10.5g of nitrourea, 20mL of water, 10mL of 80% sulfuric acid and 0.1g of Pd / C catalyst with a loading capacity of 5% into the hydrogenation reactor in sequence, and start stirring. Raise the reaction temperature to 50°C and keep the pressure at 0.5Mpa. After the reaction is over, release the pressure, centrifuge and separate the catalyst, neutralize to a sulfuric acid concentration of 10%, and then slowly add the sodium cyanate solution dropwise, wherein the sodium cyanate The content was 7.92g, and the resulting white precipitate was filtered, washed, dried and weighed. The filtrate was concentrated and crystallized, and the resulting white crystalline substance was filtered, washed, dried and weighed.
Embodiment 3
[0029] Add 10.5g of nitrourea, 20mL of water, 20mL of sulfuric acid with a concentration of 80% and 0.1g of Pd / Al with a loading capacity of 10% in the hydrogenation reactor 2 o 3 Catalyst, start stirring. Raise the reaction temperature to 50°C and keep the pressure at 1.0Mpa. After the reaction is over, release the pressure, centrifuge and separate the catalyst, neutralize to a sulfuric acid concentration of 10%, and then slowly add the sodium cyanate solution dropwise, wherein the sodium cyanate The content was 7.92g, and the resulting white precipitate was filtered, washed, dried, and its melting point was measured and weighed. The filtrate was concentrated and crystallized, and the resulting white crystalline substance was filtered, washed, dried, and its melting point was measured and weighed.
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