Recovery method of dmf and inorganic salt in ceftazidime side chain ester wastewater
A ceftazidime and recovery method technology, applied in the field of waste water treatment and recovery, can solve the problems of harsh use conditions, low efficiency, high recovery cost, etc., and achieve the effects of high recovery rate, simple process, and shortened recovery time
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Embodiment 1
[0021] Take 1000mL of etherified wastewater, add 2000mL of chloroform for extraction, extract three times in total, the extraction time is 10min, and the standing time is 10min, and the chloroform phase and the water phase are combined for later use.
[0022] The combined chloroform phases were distilled under reduced pressure, and a small amount of CaCO was placed at the bottom of the distillation flask 3 , the pressure is not lower than -0.08MPa, the temperature range is 35 ± 25 ° C, until there is no liquid in the distillate phase, the collected distillate chloroform continues to be used as an extraction agent, and the remaining organic phase in the bottom flask is DMF ( About 131mL), the recovery rate is 87.3%, the purity is 99.2%, and the water content is 0.07%; the combined water phase is added to the scraper evaporator, the vacuum distillation pressure is -0.08MPa, and the jacket temperature is not lower than 75°C , until all the water is evaporated, the salt in the bot...
Embodiment 2
[0024] Take 1000mL of etherified wastewater, add 2500mL of chloroform for extraction, and extract four times in total. The extraction time is 15 minutes, and the resting time is 10 minutes. The chloroform phase and the water phase are combined for later use.
[0025] The combined chloroform phases were distilled under reduced pressure, and a small amount of CaCO was placed at the bottom of the distillation flask 3 , the pressure is not lower than -0.08MPa, the temperature range is 35 ± 25 ° C, until there is no liquid in the distillate phase, the collected distillate chloroform continues to be used as an extraction agent, and the remaining organic phase in the bottom flask is DMF ( About 132mL), the recovery rate is 88%, the purity is 99.5%, and the water content is 0.06%; the combined aqueous phase is added to the scraped evaporator, the vacuum distillation pressure is -0.08MPa, and the jacket temperature is not lower than 75°C , until all the water is evaporated, the salt in...
Embodiment 3
[0027] Take 1000mL of etherified wastewater, add 3000mL of chloroform for extraction, extract five times in total, the extraction time is 15min, and the standing time is 10min, and the chloroform phase and the water phase are combined for later use.
[0028] The combined chloroform phases were distilled under reduced pressure, and a small amount of CaCO was placed at the bottom of the distillation flask 3 , the pressure is not lower than -0.08MPa, the temperature range is 35 ± 25 ° C, until there is no liquid in the distillate phase, the collected distillate chloroform continues to be used as an extraction agent, and the remaining organic phase in the bottom flask is DMF ( about 134mL), the recovery rate was 89.3%, the purity was 99.1%, and the moisture content was 0.09%; the combined aqueous phase was added to a scraped evaporator, the vacuum distillation pressure was -0.08MPa, and the jacket temperature was not lower than 75°C , until all the water is evaporated, the salt in...
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Abstract
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