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Method for recycling butyl acetate from antibiotic production wastewater

A technology for butyl acetate and waste water production, which is applied in the preparation of carboxylate, chemical instruments and methods, natural water treatment and other directions to achieve the effects of saving heating energy consumption, reducing treatment temperature and avoiding losses

Active Publication Date: 2019-07-05
浙江普洛生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can significantly reduce the energy consumption of the wastewater recycling process, and improve the problem of equipment blockage caused by the polymerization of macromolecules in the wastewater recycling process

Method used

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  • Method for recycling butyl acetate from antibiotic production wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Kitamycin production wastewater with 0.83% butyl acetate and a flow rate of 1.5m 3 / h, the steam is directly mixed and heated to about 65°C and then enters the scraped film evaporator. The vacuum degree of the scraped film evaporator is controlled to be -0.091MPa for vacuum distillation. The overhead steam was condensed with water at 15°C and collected and separated to obtain recovered butyl acetate. The discharge temperature of the liquid at the bottom of the tower is 54°C, and it is discharged after being cooled to below 40°C by a heat exchanger. The content of butyl acetate in the tower bottom liquid was detected to be 0.03%, and the theoretical recovery rate was 96.4%. Since the vacuum pump circulating cooling water is applied to the recovery system in the actual production system, the actual recovery rate of butyl acetate will be close to the theoretical recovery rate. After recycling, the COD of wastewater dropped from the original 16675mg / L to 10592mg / L.

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Embodiment 2

[0035] Kitamycin production wastewater, butyl acetate content is 0.79%, flow rate is 1.0m 3 / h, the steam is directly mixed and heated to about 70°C and then enters the scraped film evaporator. The vacuum degree of the scraped film evaporator is controlled to be -0.085MPa for vacuum distillation. The overhead steam was condensed with water at 15°C and collected and separated to obtain recovered butyl acetate. The discharge temperature of the liquid at the bottom of the tower is 59°C, and it is discharged after being cooled to below 40°C by a heat exchanger. The content of butyl acetate in the bottom liquid was detected to be 0.05%, and the theoretical recovery rate was 93.7%. Since the vacuum pump circulating cooling water is applied to the recovery system in the actual production system, the actual recovery rate of butyl acetate will be close to the theoretical recovery rate. After recycling, the COD of wastewater dropped from 17136mg / L to 11547mg / L.

Embodiment 3

[0037] Kitamycin production wastewater, butyl acetate content is 0.86%, flow rate is 1.0m 3 / h, the steam is directly mixed and heated to about 80°C and then enters the scraped film evaporator. The vacuum degree of the scraped film evaporator is controlled to be -0.074MPa for vacuum distillation. The overhead steam was condensed with water at 15°C and collected and separated to obtain recovered butyl acetate. The discharge temperature of the liquid at the bottom of the tower is 71°C, and it is cooled to below 40°C by a heat exchanger and discharged. The content of butyl acetate in the bottom liquid was detected to be 0.07%, and the theoretical recovery rate was 91.8%. Since the vacuum pump circulating cooling water is applied to the recovery system in the actual production system, the actual recovery rate of butyl acetate will be close to the theoretical recovery rate. After recovery, the COD of wastewater dropped from the original 18316mg / L to 12547mg / L.

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Abstract

The invention discloses a method for recycling butyl acetate from antibiotic production wastewater. The method includes the following steps that antibiotic production wastewater containing butyl acetate is mixed and heated directly by steam to 55-85 DEG C and then enters a scraper film evaporator for vacuum distillation and separation, and in the recycling process, the vacuum degree of the scraperfilm evaporator is controlled to be -0.05 to -0.095 MPa. After the method is adopted for recycling, the content of butyl acetate in wastewater can be reduced to 0.05% or below, and the recycling rateof butyl acetate can reach 90% or above. Compared with a recycling method with a traditional rectifying tower, the method adopts decompression recycling, energy consumption of the recycling process can be significantly reduced, and the scaling and tower blocking problems caused by feed liquid in the recycling process can be well solved by adopting steam direct heating and a scraper system.

Description

technical field [0001] The invention belongs to the field of antibiotic drug production, in particular to a method for recovering butyl acetate from antibiotic production wastewater. Background technique [0002] Butyl acetate is an excellent extraction solvent. During the production of antibiotics, butyl acetate is often used to extract active ingredients from antibiotic fermentation filtrates. However, because butyl acetate and water have a certain mutual solubility, the raffinate waste liquid will contain about 1% (wt%, the butyl acetate concentration mentioned below is all mass percent) residual butyl acetate. Although the content of butyl acetate in the production wastewater is very low, due to the large amount of wastewater, up to hundreds of tons per day, serious waste will be caused if recovery is not considered. On the other hand, butyl acetate will increase the COD value of wastewater. According to theoretical calculations, 1% butyl acetate contributes up to 22,00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/08C07C69/14C07C67/54C02F103/34
CPCC02F1/08C02F2103/343C07C67/54C07C69/14
Inventor 许永兴胡跃龙张凯吴兴胡露华纪春华陆险峰卢立者
Owner 浙江普洛生物科技有限公司