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A kind of method of electrodialysis purifying dimethyl sulfone

A technology of dimethyl sulfone and electrodialysis, applied in electrodialysis, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of energy consumption in the separation process

Active Publication Date: 2021-08-17
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multiple chemical products are added to the process and the separation process is very energy-intensive

Method used

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  • A kind of method of electrodialysis purifying dimethyl sulfone
  • A kind of method of electrodialysis purifying dimethyl sulfone
  • A kind of method of electrodialysis purifying dimethyl sulfone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Dimethyl sulfone and sodium nitrate are configured as a mixture according to a mass ratio of 4:1, and then the mixture is mixed with water to form a crude dimethyl sulfone solution with a mass concentration of dimethyl sulfone of 20%. The dimethyl sulfone The concentration of the crude product solution is passed into the desalination chamber respectively, and the mass concentration of sodium nitrate in the concentration chamber is controlled to be 6%.

[0036] Under the above reaction conditions, as attached figure 2 As shown, the voltage is controlled at 5V, 10V, 20V and 30V respectively, and the attached figure 2 It can be clearly seen that the conductivity of the desalination chamber decreases with the passage of time, and it is even more obvious that the higher the voltage is, the greater the rate of conductivity change is in this case. In the case of the same other factors, the initial conductivity is not much different, but the root I=U / R shows that due to the ...

Embodiment 2

[0040] Referring to the operation of Example 1, the difference is that in this group of reaction process, the voltage of the control reaction is 20V, and the mass concentration of dimethyl sulfone in the desalination chamber in the reaction vessel is adjusted successively to be 5%, 10%, and 20% respectively and 30%. as attached Figure 5 As shown, it can be seen that the conductivity decreases with the passage of time, and at the beginning, the greater the concentration of dimethyl sulfone, the greater the conductivity. The greater the dimethyl sulfone concentration in the desalination chamber measured at the beginning, the greater the overall salt concentration of the desalination chamber, the greater the ion concentration, and the greater the conductivity. As the ions in the desalination chamber enter the concentration chamber through the ion exchange membrane, the desalination chamber The concentration of salt ions in it will decrease, so as to achieve the purpose of purif...

Embodiment 3

[0044] Referring to the operation of Example 1, the difference is that during this group of reactions, the voltage of the control reaction is 20V, and the mass concentration of the electrolyte sodium nitrate in the concentration chamber is sequentially adjusted to 3%, 6%, 9% and 12%. attached by Figure 8 It can be seen that at the beginning, the rate of decline of the conductivity under each salt concentration is basically the same, but after five minutes, the conductivity of the electrolytic system whose mass concentration of sodium nitrate in the concentration chamber is 3% changes the fastest and the final value is the smallest, which is Due to concentration osmosis diffusion, when the concentration of salt in the concentrating chamber is too high, it will quickly reach saturation during the electrodialysis process, resulting in a decrease in desalination efficiency. Therefore, in the reaction system, attention should be paid to maintaining the salt concentration in the co...

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Abstract

The invention provides a method for purifying dimethyl sulfone by electrodialysis, constructing an electrodialysis system, the electrodialysis system includes a power supply and sequentially arranged cathode plates, electrodialysis modules, and anode plates; the electrodialysis membrane group is Anion-exchange membranes in sequence‑ (cation-exchange membrane‑anion-exchange membrane) N , wherein N is an integer of 1-30; a cathode chamber is formed between the cathode plate and the adjacent anion exchange membrane, and an anode chamber is formed between the anode plate and the adjacent anion exchange membrane; Connect to the cathode plate, electrically connect the anode of the power supply to the anode plate; circulate the electrode solution to the cathode chamber and the anode chamber, circulate the dimethyl sulfone solution containing electrolyte impurities to the desalination chamber, and circulate to the concentration chamber Supplying electrolyte solution; the method is green and environmentally friendly, energy-saving and efficient, and can prepare high-purity dimethyl sulfone products, which is of great significance.

Description

technical field [0001] The invention relates to the field of compound purification, in particular to a method for electrodialysis purification of dimethyl sulfone. Background technique [0002] Dimethyl sulfone (DMSO 2 , MSM) is an organic sulfide, also known as methylsulfonylmethane. In the industry, it is used as a high-temperature solvent for organic and inorganic substances, pesticides and other medicines, food additives, fiber dyeing additives, etc. It is called "natural beautifying carbon substance" and is an important component of collagen synthesis in the human body. Since dimethyl sulfone is a newly discovered nutrient, and at the same time plays the role of an indispensable sulfur attachment in the human body, it has a considerable effect on human health and is a must for human survival and health protection Drugs are necessary substances for the synthesis of collagen in the human body. The demand for dimethyl sulfone products is also increasing accordingly. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C315/06C07C317/04B01D61/42
CPCB01D61/422C07C315/06C07C317/04Y02P20/10
Inventor 潘先群方勤翔刘俊生陈俊张勇金杰卫新来叶劲松
Owner HEFEI UNIV
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