Process for producing oxygen methyl isourea acetate
A technology of oxymethylisourea bisulfate and oxymethylisourea, which is applied in the field of preparation of oxymethylisourea acetate, can solve problems such as poor yield, difficult removal, and difficult separation and removal, and achieves The effect of high purity, high yield and simple process
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Embodiment 1
[0017] Put 292.4Kg (1.7Kmol) oxymethylisourea bisulfate (95.5%), 150Kg (1.83Kmol) sodium acetate and 68Kg (1.7Kmol) sodium hydroxide in 446Kg (14Kmol) methanol, and at 30°C After stirring for 5 hours, filter, rinse the filter residue with a small amount of methanol, and put the filtrate into the concentration kettle, and concentrate it in vacuum at 60°C. The concentrated solution enters the crystallization kettle to crystallize. Finally, 165 Kg (75.9%) of oxymethylisourea acetate with a purity of 98% was obtained.
Embodiment 2
[0019] Put 292.4Kg (1.7Kmol) oxymethylisourea bisulfate (95.5%), 145Kg (1.77Kmol) sodium acetate and 70Kg (1.75Kmol) sodium hydroxide in 446Kg (17Kmol) methanol, and at 40°C Stir for 8 hours and then filter, rinse the filter residue with a small amount of methanol, put the filtrate into the concentration kettle, and concentrate in vacuum at 70°C, the concentrated solution enters the crystallization kettle for crystallization, filter after crystallization, and dry the product in vacuum at 50°C Finally, 160 Kg (73.6%) of oxymethylisourea acetate with a purity of 98% was obtained.
Embodiment 3
[0021] Put 292.4Kg (1.7Kmol) oxymethylisourea bisulfate (95.5%), 140Kg (1.7Kmol) sodium acetate and 70Kg (1.75Kmol) sodium hydroxide in 446Kg (14Kmol) methanol, and at 20°C After stirring for 4 hours, filter, rinse the filter residue with a small amount of methanol, and put the filtrate into the concentration tank, and concentrate it in vacuum at 65°C. The concentrated solution enters the crystallization tank for crystallization. Finally, 155 Kg (71.3%) of oxymethylisourea acetate with a purity of 98% was obtained.
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