Recovery method and application of alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water

A kind of recovery method, the technology of acetyl group

Pending Publication Date: 2022-03-15
江苏兄弟维生素有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, if the stratified water obtained here is treated as wastewater, it will enter the three-effect system of the company's environmental protection facilities for distillation and desalination. However, due to the α-chloro-α-acetyl-γ- The presence of butyrolactone will lead to more viscous residues in the distillation process, which seriously affects the normal operation of the company's environmental protection facilities and restricts the efficiency of the company's wastewater treatment
[0005] If the α-chloro-α-acetyl-γ-butyrolactone in the delaminated water is extracted and recovered with an organic solvent, it will cause difficulties in the recovery of the organic solvent and form new environmental pollution, and the tail gas VOC is too high and the treatment cost is large. Therefore should not adopt organic solvent extraction recovery α-chloro-α-acetyl-γ-butyrolactone

Method used

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  • Recovery method and application of alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water
  • Recovery method and application of alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water
  • Recovery method and application of alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water

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Experimental program
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Effect test

Embodiment 1

[0054] (a) 192g of α-acetyl-γ-butyrolactone, 125g of baking soda and 252g of water are put into the reaction equipment, the temperature is controlled within 18°C, and then 110g of chlorine gas is fed into the reaction, and the reaction is left to stand for stratification. Obtain product α-chloro-α-acetyl-γ-butyrolactone 231.2g and layered water 377.8g;

[0055] (b) After adjusting the obtained layered water to neutrality with 10g of baking soda, control the vacuum above -0.095Mpa and carry out steaming at a constant temperature of 50°C to obtain 11g of the product. The moisture detection is 70%, and the meteorological detection only has α-chlorine Dai-α-acetyl-γ-butyrolactone peak shape, thus recovering 3.3 g of α-chloro-α-acetyl-γ-butyrolactone.

Embodiment 2

[0057] (a) 192g of α-acetyl-γ-butyrolactone, 125g of baking soda and 252g of water are put into the reaction equipment, and the temperature is controlled within 18°C, and then 110g of chlorine gas is introduced to react, and after the reaction is finished, it is allowed to stand for stratification to obtain Product α-chloro-α-acetyl-γ-butyrolactone 231.6g and delamination water 377.1g;

[0058] (b) After adding 10 g of sodium thiosulfate to the obtained layered water, adjust it to neutral with 7.1 g of sodium bicarbonate, then control the vacuum to -0.095Mpa and distill water at a constant temperature of 50°C to obtain 20 g of the product, The moisture detection was 62%, and the meteorological detection only had the peak type of α-chloro-α-acetyl-γ-butyrolactone, thus recovering 7.6 g of α-chloro-α-acetyl-γ-butyrolactone.

Embodiment 3

[0060] (a) 192g of α-acetyl-γ-butyrolactone, 125g of baking soda and 252g of water are put into the reaction equipment, and the temperature is controlled within 18°C, and then 110g of chlorine gas is introduced to react, and after the reaction is finished, it is allowed to stand for stratification to obtain Product α-chloro-α-acetyl-γ-butyrolactone 231.5g and delamination water 377.2g;

[0061] (b) Seal the obtained layered water with ultraviolet light for 1 hour, then adjust it to neutral with 9.5g of baking soda, control the vacuum above -0.095Mpa and distill water at a constant temperature of 50°C to obtain 19g of the product, moisture detection It was 47%, and there was only α-chloro-α-acetyl-γ-butyrolactone peak type in meteorological detection, thus 10.07 g of α-chloro-α-acetyl-γ-butyrolactone was recovered.

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Abstract

The invention provides a recovery method and application of alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water, and relates to the technical field of chemical engineering. The recovery method comprises the following steps: neutralizing the alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water with alkali, and then evaporating water; and the recovered alpha-chloro-alpha-acetyl-gamma-butyrolactone is obtained by using the method disclosed by the invention. The method provided by the invention solves the technical problem of unsmooth operation of environmental protection facilities caused by viscous substances generated when the alpha-chloro-alpha-acetyl-gamma-butyrolactone layered water is used as wastewater for distillation desalination treatment, and achieves the purpose of recovering alpha-chloro-alpha-acetyl-gamma-butyrolactone from the layered water. The economic benefit is improved; and the operation efficiency of environmental protection facilities is improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for recovering alpha-chloro-alpha-acetyl-gamma-butyrolactone stratified water and its application. Background technique [0002] The existing α-chloro-α-acetyl-γ-butyrolactone synthesis process uses α-acetyl-γ-butyrolactone, baking soda and water as starting materials, and reacts with chlorine gas. After the reaction Static stratification can obtain product α-chloro-α-acetyl-γ-butyrolactone, while the yield of the stratification method is only 95%, and there are still about 5% products in the stratified water left. available and used. Based on the input of 5.76 tons of raw material α-acetyl-γ-butyrolactone per day, the lost product α-chloro-α-acetyl-γ-butyrolactone is about 0.365 tons, and every ton of α-chloro The unit price of Dai-α-acetyl-γ-butyrolactone products is about 55,000 yuan, which is equivalent to an annual loss (based on 300 days of production) ...

Claims

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Application Information

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IPC IPC(8): C07D307/33C07D415/00
CPCC07D307/33C07D415/00
Inventor 徐晓海陈英明严建斌袁龙英郭军军
Owner 江苏兄弟维生素有限公司
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