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Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 2. Отображено 2.
13-06-2023 дата публикации

Method for recovering acetone and acetylacetone in sulfamethazine condensation reaction

Номер: CN116253629A
Автор: QIU WEIJIE, LI XIAOXIONG, WU YONGXIN, YUAN LILI, BAI AILIAN, LIU MINGWEI, HE SIMIN, SHUYAO JUNZI
Принадлежит:

The invention discloses a method for recovering acetone and acetylacetone in a sulfamethazine condensation reaction, which comprises the following steps: after the condensation reaction, firstly, carrying out pressure regulation and pressure relief distillation to obtain a mixed solution of acetylacetone and acetone containing a large amount of water, then carrying out conventional distillation to obtain a mixed solution of acetylacetone and acetone with a low boiling point, and finally, recovering acetone and acetylacetone from sulfamethazine. The method comprises the following steps: separating most of water from sulfadimidine, fractionating at a lower temperature to obtain high-purity acetone, and finally carrying out azeotropic distillation and rectification to obtain high-purity acetylacetone, so that the residual organic solvent in the condensation reaction of sulfadimidine is recovered, the acetone and acetylacetone are prevented from entering the sulfadimidine condensation mother ...

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Номер записи: 1
05-05-2023 дата публикации

Production process for removing impurities from sulfamethazine

Номер: CN116063236A
Автор: QIU WEIJIE, LI XIAOXIONG, WU YONGXIN, YUAN LILI, BAI AILIAN, LIU MINGWEI, HE SIMIN, SHUYAO JUNZI
Принадлежит:

The invention discloses a production process for removing impurities from sulfamethazine. The method comprises the following steps: firstly, dropwise adding liquid caustic soda to completely dissolve a sulfadimidine crude product, then separating out most impurities in the sulfadimidine crude product through activated carbon and sulfurous acid salt, and then carrying out heating and pressurizing, decolorizing and filtering, activated carbon filtering and neutralization reaction to obtain the high-purity sulfadimidine. Most impurities of sulfadimidine are removed, the product quality is improved, the sulfadimidine meets the regulations of the current European pharmacopoeia, the higher standard requirements of European customers are met, the competitiveness of the product is improved, and export is facilitated.

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Номер записи: 2