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Method for recovering diethylamino ethanethiol from taimulin production waste water

A technology for the production of ethylaminoethanethiol and waste water, which is applied in the field of medicine and chemical industry, can solve the problems of no extraction and recovery of diethylaminoethanethiol, etc., and achieve the effect of good recovery effect, high purity and reasonable design

Active Publication Date: 2009-04-29
浙江拜克生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is no technical record of extracting and recovering diethylaminoethanethiol from tiamulin production wastewater in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take the tiamulin production wastewater from the workshop, slowly heat it to 60°C at a vacuum degree of 0.095MPa, then stop heating and concentrate, and measure the content of diethylaminoethanethiol to 15%. Take 1000g of this wastewater, adjust the pH to 10; then extract it with dichloromethane, and then separate it; take the lower layer liquid, then heat and concentrate the lower layer liquid at normal pressure, and after the temperature rises to 60°C, stop heating and concentration; concentrate The liquid is subjected to vacuum rectification, the vacuum degree is above 0.09MPa, the top of the tower before 70°C is the front fraction, 70-100°C is the middle fraction, and above 100°C is the back fraction. Collect 70-100 ℃ gained cut, obtain diethylaminoethanethiol 120g, its productive rate 80%, boiling point is 160-162 ℃, refractive index n 20 D = 1.460-1.470.

Embodiment 2

[0019] Chloroform was adopted during extraction, and other process steps were all the same as in Example 1, finally obtained 113 grams of diethylaminoethanethiol, with a yield of 75%, a boiling point of 160-163°C, and a refractive index of n 20 D = 1.460-1.474.

Embodiment 3

[0021] Take the tiamulin production wastewater from the workshop, slowly heat it to 65° C. at a vacuum degree of 0.096 MPa, then stop heating and concentrate, and measure the content of diethylaminoethanethiol to 13%. Take 1000g of this waste water, adjust the pH to 9; then extract and stratify it with chloroform; then heat and concentrate the lower layer under normal pressure until the temperature rises to 60°C, then stop heating and concentrating; then depressurize the concentrated solution Rectification, the vacuum degree is above 0.09MPa, and the fraction obtained at the top of the tower at 70-100°C is collected to obtain 94g of diethylaminoethanethiol with a yield of 72%, a boiling point of 159-162°C, and a refractive index of n 20 D = 1.458-1.470.

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Abstract

The invention discloses a method for reclaiming diethylaminoethanethiol from tiamulin production wastewater, which belongs to the technical field of medical and chemical industries. The method comprises the following steps: the tiamulin production wastewater is subjected to pressure reduction concentration and the pH value of the wastewater is adjusted; then the extraction is performed; then the heating concentration is performed; and finally the rectification is performed, and fractions obtained at a temperature of between 70 and 100 DEG C are taken. The method ensures that the diethylaminoethanethiol in wastewater is dissociated out from the wastewater by adjusting the pH value, then uses an organic solvent with good intermiscibility for extraction and layering, and then performs heating concentration and rectification to obtain the diethylaminoethanethiol with higher purity. The reclaiming method has reasonable design and simple operation; and the obtained product has higher purity and good reclaiming effect.

Description

technical field [0001] The invention belongs to the technical field of medicine and chemical industry, and in particular relates to a method for recovering diethylaminoethanethiol from tiamulin production wastewater. Background technique [0002] Tiamulin is one of the top ten veterinary antibiotics in the world. It can be used to prevent and treat diseases caused by mycoplasma infection, Escherichia coli, Salmonella, spirochete and other infections. It has special effects on endemic pneumonia, endemic pneumonia and dysentery. It has a wide range of applications in the farming industry, especially in the chicken farming and pig farming industries. As a key intermediate in the production of tiamulin, diethylaminoethanethiol is in great demand in the pharmaceutical industry. [0003] There is no technical record of extracting and recovering diethylaminoethanethiol from tiamulin production wastewater in the prior art. Contents of the invention [0004] Aiming at the above-...

Claims

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Application Information

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IPC IPC(8): C07C323/25C07C319/28C07C323/52
Inventor 陈建华费月明黄琴
Owner 浙江拜克生物科技有限公司
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