Sulfamethoxazole decoloring and refining process with sulfur dioxide and carbamide
A technology of thiourea dioxide and sulfamethoxazole, applied in the direction of organic chemistry, etc., can solve the problems of low sulfamethoxazole specification, lack of competitive advantage, backward decolorization and refining process, etc.
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[0005] Example: In the decolorization pot, add 200 kg of sulfamethoxazole crude product, add 1000 kg of pure water, gradually increase the temperature, add 30 kg of activated carbon, raise the temperature to 85±5°C, keep the temperature for 0.5 to 1 hour for decolorization, and then put the mother liquor while it is hot Filtrate, press filter mother liquor into the crystallization pot, add charcoal washing water to the decolorization at the same time, after heating to 85-90°C, press filter, wash charcoal in stages, and press dry. Heat the filtrate to 85±1°C, add 0.6 kg of thiourea dioxide, acidify with dilute hydrochloric acid, measure the pH value with precision test paper between 4.1 and 4.6, keep unchanged for ten minutes, raise the temperature to 90±2°C, cool to 25°C, Keep the temperature and PH value constant for a period of time (as the PH value increases, it is necessary to continuously retest and add hydrochloric acid to 25 degrees Celsius to keep the PH value constant)...
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