Method for synthesizing powdered nitric acid by using allantoin synthetic waste liquid
A technology of allantoin and nitric acid, applied in chemical instruments and methods, preparation of organic compounds, preparation of urea derivatives, etc., can solve problems such as environmental pollution and complicated recycling process, and achieve the goal of reducing environmental pollution and reducing production costs Effect
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Embodiment 1
[0023] In a 500 mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, 120 g (2.0 mol) of urea, 200 mL of deionized water and 183 g of 50% sulfuric acid were added. Heat to 60-70° C. in a water bath, add 92 g (0.5 mol) of 40.2% industrial glyoxylic acid within 0.5 hours, and stir for 4 hours to complete the reaction. Cool the reactant to 20°C, centrifuge and wash to obtain a wet product of allantoin. The allantoin synthesis mother liquor is about 500g, of which urea accounts for about 60g (1.0mol), sulfuric acid 92g, and diuretic acid by-product about 40g.
[0024] Concentrate the mother liquor in vacuum to about half volume, put it into a 500mL four-necked reaction bottle, cool it to below 5°C with ice water, slowly add 97g (1.0mol) of dilute nitric acid with a concentration of 65% by weight under stirring, and constantly have nitric acid Precipitation of white urea crystals, control the reaction temperatur...
Embodiment 2
[0026] In a 500mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add urea 120g (2.0mol), 31% concentrated hydrochloric acid 200mL and 40.2% industrial glyoxylic acid 92g (0.5mol), Heating in a water bath, stirring at 60-70°C for 4 hours, cooling the condensation reaction liquid to 20°C, centrifuging and washing to obtain the allantoin wet product. The allantoin synthesis mother liquor is about 350g, of which urea accounts for about 61g (1.0mol), hydrochloric acid 62g, and diuretoacetic acid by-product about 35g.
[0027] Concentrate the mother liquor in vacuum to about half volume, put it into a 500mL four-neck reaction bottle, cool it to below 5°C with ice water, slowly add 97g (1.0mol) of dilute nitric acid with a concentration of 65% by weight under stirring, and constantly have nitric acid White urea crystals are precipitated. Control the reaction temperature below 20°C during feeding, keep the tempe...
Embodiment 3
[0029] In a 500mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add urea 120g (2.0mol), deionized water 200mL, 50% nitric acid 50mL and 40.2% industrial glyoxylic acid 92g ( 0.5mol), heated in a water bath, stirred at 60-70°C for 4 hours, cooled the condensation reaction solution to 20°C, centrifuged, washed to obtain the wet product of allantoin. The allantoin synthesis mother liquor is about 400g, of which urea accounts for about 63g (1.05mol), nitric acid is 32g, and diuretoacetic acid by-product is about 30g.
[0030]Concentrate the mother liquor in vacuum to about half volume, put it into a 500mL four-neck reaction bottle, cool it to below 5°C with ice water, a small amount of white crystals of urea nitrate precipitates, slowly add 48.5% dilute nitric acid with a concentration of 65% by weight under stirring g (0.5mol), control the reaction temperature below 20°C during the feeding, keep the reacti...
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