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Method for recycling ethylene glycol monomethyl ether

A technology of ethylene glycol monomethyl ether and salting out, which is applied in the recovery field of ethylene glycol monomethyl ether, can solve the problems of poor treatment effect, pollute the environment and high recovery cost, achieve broad application prospects, flexible and simple operation, low cost effect

Inactive Publication Date: 2015-06-17
HUNAN HAILI ZHUZHOU FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also the dehydration method of desiccant (such as calcium chloride, etc.) used in industrial production, but the regeneration of the slurry produced after dehydration is difficult, and a small amount of MOE is still entrained in the slurry, which is easy to cause certain problems to the environment.
Moreover, the above methods are only applicable to MOE with a low water content. For MOE with a water content higher than 40%, the above methods require a lot of energy consumption, which greatly increases the treatment cost, and the treatment effect is not good.
Especially for MOE wastewater with a moisture content of more than 80%, the recycling cost is extremely high, and the recycling effect cannot be achieved
Therefore, at present, most of the ethylene glycol monomethyl ether industrial wastewater with high water content is treated by incineration, which is not economical and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 500.0 g of industrial wastewater with a water content of 80% and a mass concentration of ethylene glycol monomethyl ether of 20% and 300.0 g of potassium fluoride into the three-necked reaction flask, stir until the potassium fluoride is completely dissolved, and transfer it to a separatory funnel for static Placed to the layered interface no longer changes, the water content of the upper organic phase organic phase is 14%.

[0013] Transfer the upper organic phase into a rectification kettle, add 10.0 g of benzene therein as an entrainer, and carry out rectification and azeotropic water separation until the amount of water in the water separator no longer changes, and the residual liquid in the kettle is obtained by rectification. The finished product of alcohol monomethyl ether is 90.1 g, the measured water content is 0.1%, and the recovery rate is 90.0%.

Embodiment 2

[0015] Add 500.0 g of industrial wastewater with a water content of 80% and a mass concentration of ethylene glycol monomethyl ether of 20% into the three-necked reaction flask, and 300.0 g of potassium fluoride, stir until the potassium fluoride is completely dissolved, and transfer it to a separatory funnel for static Place until the layered interface does not change, and the upper organic phase is transferred to the kettle, and the water content of the organic phase is 14%.

[0016] Add 10.0 g of toluene therein as an entrainer, rectify and azeotropically separate water until the water content in the water separator no longer changes, and the residual liquid in the kettle obtains 90.2 g of ethylene glycol monomethyl ether finished product through rectification, and the water content is measured. The rate was 0.1%, and the recovery rate was 90.1%.

Embodiment 3

[0018] Add 500.0 g of industrial wastewater with a water content of 80% and a mass concentration of ethylene glycol monomethyl ether of 20% into the three-necked reaction flask, and 300.0 g of potassium fluoride, stir until the potassium fluoride is completely dissolved, and transfer it to a separatory funnel for static Place until the layered interface does not change, and the upper organic phase is transferred to the kettle, and the water content of the organic phase is 14%.

[0019] Add 10.0 g of cyclohexane therein as an entrainer, rectify and azeotropically separate water until the amount of water in the water separator no longer changes, and obtain 89.6 g of ethylene glycol monomethyl ether product by rectifying the residual liquid in the kettle. The moisture content is 0.2%, and the recovery rate is 89.4%.

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PUM

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Abstract

The invention relates to a method for recycling ethylene glycol monomethyl ether. The method disclosed by the invention comprises the following steps: recycling an ethylene glycol monomethyl ether solution with the moisture content of being less than 20% from ethylene glycol monomethyl ether industrial waste water with the moisture content of being more than or equal to 40% by using a salting-out layering method at first, and then, rectifying to remove water in an azeotropic manner or dehydrating through a drying agent so as to obtain an ethylene glycol monomethyl ether finished product with the moisture content of being less than or equal to 0.2%. According to the invention, the methods, such as the salting-out layering method and the method for rectifying to remove water in an azeotropic manner or dehydrating through the drying agent, are combined; therefore, the method for recycling ethylene glycol monomethyl ether from industrial waste water can be realized with low cost; particularly, recovery of ethylene glycol monomethyl ether from ethylene glycol monomethyl ether industrial waste water having high moisture content can be realized with low cost; and the method disclosed by the invention has the characteristics of being low in cost, flexible, simple and convenient to operate, free from limitation of industrial raw waste water composition fluctuation and the like.

Description

technical field [0001] The invention relates to a method for recovering ethylene glycol monomethyl ether, in particular to a method for recovering ethylene glycol monomethyl ether from ethylene glycol monomethyl ether industrial waste water with high water content. Background technique [0002] Ethylene glycol monomethyl ether (abbreviated as MOE), also known as ethylene glycol methyl ether, is a colorless and transparent liquid with a boiling point of 124.6°C (101.3KPa) and a melting point of -85°C. , Acetone and DMF are miscible. As an important solvent, MOE is widely used as a solvent for various oils, cellulose acetate, nitrocellulose, alcohol-soluble dyes and synthetic resins. Quick-drying solvent for enamel and varnish, coating thinner, penetrating agent and leveling agent in dye industry, also used in printing ink and formulating sealant, making plasticizer. In recent years, MOE has been more and more used in pharmaceuticals Industry, aviation jet fuel anti-icing ag...

Claims

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Application Information

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IPC IPC(8): C07C43/13C07C41/34
CPCC07C41/34
Inventor 胡志彬杜升华黄超群王小舟陈良孔晓红王艳丽刘慧明肖雄奇
Owner HUNAN HAILI ZHUZHOU FINE CHEM
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