阅读说明：本技术 一种电渗析纯化二甲基砜的方法 (Method for purifying dimethyl sulfone by electrodialysis ) 是由 潘先群 方勤翔 刘俊生 陈俊 张勇 金杰 卫新来 叶劲松 于 2019-09-06 设计创作，主要内容包括：本发明提供了一种电渗析纯化二甲基砜的方法,构建电渗析系统,所述电渗析系统包括电源和依次排列的阴极板、电渗析模组、阳极板；所述电渗析膜组为依次排列的阴离子交换膜-(阳离子交换膜-阴离子交换膜)<Sub>N</Sub>,其中N为1-30的整数；所述阴极板与临近的阴离子交换膜之间形成阴极室,所述阳极板与临近的阴离子交换膜之间形成阳极室；将所述电源的阴极电性连接至阴极板,将所述电源的阳极电性连接至阳极板；向阴极室和阳极室循环供应电极溶液,向淡化室中循环供应含有电解质杂质的二甲基砜溶液,向浓缩室中循环供应电解质溶液；该方法绿色环保,节能高效,能够制备高纯度二甲基砜产品,具有重要的意义。(The invention provides a method for purifying dimethyl sulfone by electrodialysis, which comprises the steps of constructing an electrodialysis system, wherein the electrodialysis system comprises a power supply, and a cathode plate, an electrodialysis module and an anode plate which are sequentially arranged; the electrodialysis membrane group is an anion exchange membrane- (cation exchange membrane-anion exchange membrane) arranged in sequence N Wherein N is an integer of 1 to 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; electrically connecting the cathode of the power supply to the cathode plate and the anode of the power supply to the anode plate; circularly supplying electrode solution to the cathode chamber and the anode chamber, circularly supplying dimethyl sulfone solution containing electrolyte impurities to the desalting chamber, and circularly supplying electrolyte solution to the concentrating chamber; the method is environment-friendly and energy-savingHigh efficiency, can prepare high-purity dimethyl sulfone products and has important significance.)

1. A method for purifying dimethyl sulfone by electrodialysis, comprising: the method comprises the following steps:

(1) constructing electrodialysis systems

The electrodialysis system comprises a power supply, and a cathode plate, an electrodialysis module and an anode plate which are sequentially arranged; the electrodialysis membrane group is an anion exchange membrane- (cation exchange membrane-anion exchange membrane) arranged in sequence_NThe exchange membranes in the electrodialysis membrane group are formed in sequence from the cathode plate to the anode plate (concentration chamber-desalination chamber)_NWherein N is an integer of 1 to 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; electrically connecting the cathode of the power supply to the cathode plate and the anode of the power supply to the anode plate; circularly supplying electrode solution to the cathode chamber and the anode chamber, circularly supplying dimethyl sulfone solution containing electrolyte impurities to the desalting chamber, and circularly supplying electrolyte solution to the concentrating chamber;

(2) during the reaction, the voltage is maintained at 5-30V, the mass concentration of the dimethyl sulfone in the dimethyl sulfone solution is 5-30%, and the mass concentration of the electrolyte solution in the concentration chamber is not more than 12%;

(3) and (5) switching on the power supply, starting the electrodialysis system to work, and respectively recording time, current and voltage data.

2. A method of electrodialytic purification of dimethyl sulfone, according to claim 1, wherein: the voltage is maintained at 20V.

3. A method of electrodialytic purification of dimethyl sulfone, according to claim 1, wherein: the mass concentration of the dimethyl sulfone in the dimethyl sulfone solution is 10%.

4. A method of electrodialytic purification of dimethyl sulfone, according to claim 1, wherein: the mass concentration of the electrolyte solution in the concentration chamber is not more than 3%.

5. A method of electrodialytic purification of dimethyl sulfone, according to claim 1, wherein: the electrolyte in the concentration chamber is at least one selected from potassium nitrate, sodium nitrate, potassium sulfate and sodium sulfate.

6. A method of electrodialytic purification of dimethyl sulfone, according to claim 5, wherein: the electrolyte in the concentration chamber is sodium nitrate.

7. A method of electrodialytic purification of dimethyl sulfone, according to claim 1, wherein: the electrolyte contained in the electrode solution introduced into the cathode chamber and the anode chamber is selected from ammonium sulfate, sodium nitrate, potassium sulfate or potassium nitrate solution, and the concentration of the electrolyte is not less than 0.1 mol/L.

8. A method of electrodialytic purification of dimethyl sulfone, according to claim 7, wherein: the electrolyte in the electrode solution introduced into the cathode chamber and the anode chamber is sodium nitrate.

Technical Field

The invention relates to the field of compound purification, in particular to a method for purifying dimethyl sulfone by electrodialysis.

Background

Dimethyl sulfone (DMSO₂，MSM) is an organosulfide, also known as methylsulfonylmethane. It is used as high temperature solvent for organic and inorganic matter, pesticide and other medicine, food additive, fiber dyeing additive, etc. It is called "natural beautifying carbon substance" and is an important component for synthesizing collagen protein of human body. Because the dimethyl sulfone is a newly discovered nutrient substance and plays an indispensable role of attaching sulfur elements in the human body, the dimethyl sulfone plays a great role in the health of the human body, is a necessary medicine for human survival and health guarantee, and is a necessary substance for human collagen synthesis. The demand for dimethyl sulfone products is also increasing.

At present, a method for oxidizing dimethyl sulfoxide by nitric acid is mainly adopted for industrially producing dimethyl sulfone, in consideration of cost, a dimethyl sulfoxide crude product is usually adopted as a raw material, and sodium nitrate is a main impurity in the dimethyl sulfoxide crude product, so that a prepared dimethyl sulfone finished product contains sodium nitrate with a certain concentration, and the application of dimethyl sulfone is greatly limited, especially the application in the fields of food and pharmacy.

Disclosure of Invention

The invention aims to provide a method for purifying dimethyl sulfone, which removes salt impurities in the dimethyl sulfone by means of electrodialysis, can avoid the defects of high energy consumption and more generated chemical wastes in the traditional purification process by an environment-friendly electrodialysis process, and has no literature report similar to the technical scheme of the application at present after retrieval, so that the method for purifying dimethyl sulfone by electrodialysis has important significance.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for purifying dimethyl sulfone by electrodialysis, comprising: the method comprises the following steps:

(1) constructing electrodialysis systems

The electrodialysis system comprises a power supply, and a cathode plate, an electrodialysis module and an anode plate which are sequentially arranged; the electrodialysis membrane group is an anion exchange membrane- (cation exchange membrane-anion exchange membrane) arranged in sequence_NThe exchange membranes in the electrodialysis membrane group are formed in sequence from the cathode plate to the anode plate (concentration chamber-desalination chamber)_NWherein N is an integer of 1 to 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; electrically connecting the cathode of the power supply to the cathode plate and the anode of the power supply to the anode plate; circularly supplying electrode solution to the cathode chamber and the anode chamber, circularly supplying dimethyl sulfone solution containing electrolyte impurities to the desalting chamber, and circularly supplying electrolyte solution to the concentrating chamber;

(2) during the reaction, the voltage is maintained at 5-30V, the mass concentration of the dimethyl sulfone in the dimethyl sulfone solution is 5-30%, and the mass concentration of the electrolyte solution in the concentration chamber is not more than 12%;

(3) and (5) switching on the power supply, starting the electrodialysis system to work, and respectively recording time, current and voltage data.

Further, the voltage is maintained at 20V.

Further, the mass concentration of the dimethyl sulfone in the dimethyl sulfone solution is 10%.

Further, the mass concentration of the electrolyte solution in the concentration chamber is not more than 3%.

Further, the electrolyte in the concentrating chamber is selected from at least one of potassium nitrate, sodium nitrate, potassium sulfate and sodium sulfate.

Further, the electrolyte in the concentration chamber is sodium nitrate.

Further, the electrolyte introduced into the cathode chamber and the anode chamber is selected from a solution of ammonium sulfate, sodium nitrate, potassium sulfate or potassium nitrate, and the concentration of the electrolyte is not less than 0.1 mol/L. When the electrolyte solution introduced into the concentration chamber and the electrode solution introduced into the electrode chamber contain sodium nitrate, the by-product generated in the concentration chamber is also sodium nitrate, namely, high-value-added high-purity dimethyl sulfone is obtained, and simultaneously, high-purity sodium nitrate by-product is also obtained.

Further, the electrolyte in the electrode solution introduced into the cathode chamber and the anode chamber is sodium nitrate.

The invention has the beneficial effects that:

(1) the process route for purifying the dimethyl sulfone by the electrodialysis process is explored, and the defects that the energy consumption is high due to the fact that the traditional dimethyl sulfone purification process is pure and pollution waste is caused by the need of using other chemicals can be overcome. The by-product produced by the process disclosed by the invention is high in purity, and can be used as a high-quality by-product to increase the additional value of the process.

(2) The technological parameters of the dimethyl sulfone purification by using xylose as raw material and adopting an electroosmosis process are determined through single factor control.

(3) The dimethyl sulfone product produced by the traditional process has low purity, is difficult to meet the application requirement of the market on the high-purity dimethyl sulfone, and can be obtained by an electrodialysis method.

Drawings

FIG. 1 is a schematic diagram of the purification of dimethyl sulfone by electrodialysis.

FIG. 2 is a schematic diagram of conductivity change in the desalination chamber at different voltages.

Fig. 3 is a schematic diagram of the current change of the electrodialysis system under different voltages.

FIG. 4 is a graph showing the change of desalination rate and recovery rate at different voltages.

FIG. 5 is a schematic diagram of the conductivity change of the desalting chamber under different dimethyl sulfone concentrations.

FIG. 6 is a graph of power consumption for different dimethyl sulfone concentrations.

FIG. 7 is a graph showing the change in salt rejection and recovery for different dimethyl sulfone concentrations.

FIG. 8 is a schematic diagram of the conductivity change of the desalting chamber under different initial concentration of the concentrating chamber.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in the attached figure 1, an electrodialysis system is constructed, and a cathode plate, an electrodialysis module and an anode plate are sequentially arranged in a reaction vessel; the electrodialysis membrane group is an anion exchange membrane- (cation exchange membrane-anion exchange membrane) arranged in sequence_NThe exchange membranes in the electrodialysis membrane group are formed in sequence from the cathode plate to the anode plate (concentration chamber-desalination chamber)_NWherein N is an integer of 1 to 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; electrically connecting the cathode of the power supply to the cathode plate and the anode of the power supply to the anode plate; electrode solution is circularly supplied to the cathode chamber and the anode chamber, dimethyl sulfone solution containing electrolyte impurities is circularly supplied to the desalting chamber, and electrolyte solution is circularly supplied to the concentrating chamber.

After the power is switched on, the concentration chamber is a sodium nitrate solution with a certain concentration, or other electrolyte solutions, and the desalination chamber is a mixed solution of dimethyl sulfone and sodium nitrate. And (3) monitoring the conductivity in the desalting chamber at any time by a conductivity meter in the reaction process, recording the voltage displayed by the voltage stabilizing and current stabilizing power supply, and recording the desalting rate = (measured concentration-initial concentration) × 100%.