A new green solvent of ethylene glycol and its preparation method

Abstract

The invention discloses a new green solvent of ethylene glycol and a preparation method thereof. The new green solvent of ethylene glycol includes the following raw materials in parts by weight: ethylene glycol: 50-80 parts; acetamide: 10-30 parts; ethylene glycol ether: 5-15 parts; water: 5-15 parts; The preparation method of the new green solvent of ethylene glycol comprises the following steps: S100, mixing ethylene glycol and acetamide, heating to 60-80°C, and stirring evenly; S200, adding ethylene glycol ether, and continuing to stir for 30 minutes; S300, cooling to room temperature, adding water, and continuing to stir for 15 minutes, that is, preparing the new green solvent of ethylene glycol. The invention provides a new green solvent with ethylene glycol as the main component and a preparation method thereof. The new green solvent of ethylene glycol is based on low-toxic and degradable ethylene glycol, and the addition of a cosolvent greatly improves the dissolving power, and can dissolve a variety of organic matter and inorganic salts. At the same time, it has excellent chemical stability, thermal stability and environmental friendliness.

Description

Technical Field

[0001] The invention relates to the technical field of green chemistry and environmentally friendly solvents, in particular to a novel green ethylene glycol solvent and a preparation method thereof. Background Art

[0002] Solvents are widely used in many fields such as chemical industry, pharmaceutical industry, coating, cleaning, etc. Traditional organic solvents such as toluene and dichloromethane have many defects such as high toxicity, flammability, and difficulty in degradation, which pose a serious threat to the environment and human health. Especially in large-scale industrial production, the use of these traditional solvents not only brings serious environmental pollution problems, but also increases the health risks of operators. Therefore, the development of environmentally friendly green solvents has attracted much attention.

[0003] Ethylene glycol is an important bulk chemical raw material with the advantages of low toxicity and easy biodegradability. It is widely used in food, medicine, cosmetics and other fields. However, ethylene glycol used alone as a solvent has problems such as poor volatility and limited solubility, which limits the application of ethylene glycol in a wider range of fields. Summary of the invention

[0004] The purpose of the present invention is to provide a new green solvent of ethylene glycol and a preparation method thereof, to develop a new green solvent with ethylene glycol as the main component, excellent dissolving power and environmental friendliness, and to overcome the shortcomings of the prior art.

[0005] The present invention is achieved in that:

[0006] According to one aspect of the present invention, the present invention provides a novel green solvent of ethylene glycol, comprising the following raw materials in parts by weight:

[0007] Ethylene glycol: 50-80 parts;

[0008] Acetamide: 10-30 parts;

[0009] Ethylene glycol ether: 5-15 parts;

[0010] Water: 5-15 parts.

[0011] According to the second aspect of the present invention, the present invention provides a method for preparing a novel green solvent of ethylene glycol, comprising the following steps:

[0012] S100, mix ethylene glycol and acetamide, heat to 60-80°C, and stir evenly;

[0013] S200, add ethylene glycol ether and continue stirring for 30 minutes;

[0014] S300, cool to room temperature, add water, and continue stirring for 15 minutes to obtain a new green solvent of ethylene glycol.

[0015] Furthermore, the total weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the new green ethylene glycol solvent are 65%, 20%, 10% and 5% respectively.

[0016] Furthermore, the total weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the new green ethylene glycol solvent are 75%, 15%, 5% and 5% respectively.

[0017] Furthermore, the total weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the new green ethylene glycol solvent are 55%, 25%, 15% and 5% respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a new green solvent with ethylene glycol as the main component and a preparation method thereof. The new green solvent of ethylene glycol is based on low-toxic and degradable ethylene glycol, and the addition of a co-solvent greatly improves the solubility, and can dissolve a variety of organic substances and inorganic salts. At the same time, it has excellent chemical stability, thermal stability and environmental friendliness. By adjusting the raw material ratio, the solubility, stability and cost can be balanced to meet the application requirements of different fields. The invention provides a green and environmentally friendly alternative to traditional toxic solvents and has broad application prospects. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Example 1

[0021] Formulate the new green solvent of ethylene glycol by weight percentage:

[0022] Ethylene glycol: 65%

[0023] Acetamide: 20%

[0024] Ethylene glycol ether: 10%

[0025] Water: 5%

[0026] The specific preparation steps of the new green solvent of ethylene glycol are as follows:

[0027] 1. Mix ethylene glycol and acetamide, heat to 70°C and stir evenly;

[0028] 2. Slowly add ethylene glycol ether and continue stirring for 30 minutes;

[0029] 3. Cool to room temperature, add water, and continue stirring for 15 minutes to obtain the green solvent.

[0030] The performance of the obtained solvent was tested and the results are as follows:

[0031] 1. It can dissolve a variety of organic compounds such as benzene, toluene, ethyl acetate, dichloromethane, etc., and its solubility is significantly better than that of water and ethylene glycol;

[0032] 2. It also has good solubility for inorganic salts such as sodium chloride, copper sulfate, etc.;

[0033] 3. Excellent thermal stability, heating at 120°C for 8 hours, the composition and properties are basically unchanged;

[0034] 4. Low toxicity, LD50 (rat oral)>5000mg / kg, which is a practically non-toxic level;

[0035] 5. Biodegradable, after 28 days of testing, the degradation rate is 78%.

[0036] Example 2

[0037] Formulate the new green solvent of ethylene glycol by weight percentage:

[0038] Ethylene glycol: 75%

[0039] Acetamide: 15%

[0040] Ethylene glycol ether: 5%

[0041] Water: 5%

[0042] The preparation method is the same as that of Example 1. The obtained solvent is tested and has good performance, but its dissolving power is slightly lower than that of Example 1.

[0043] Example 3

[0044] Formulate the new green solvent of ethylene glycol by weight percentage:

[0045] Ethylene glycol: 55%

[0046] Acetamide: 25%

[0047] Ethylene glycol ether: 15%

[0048] Water: 5%

[0049] The preparation method is the same as that of Example 1. The obtained solvent is tested, and the dissolving power is better than that of Example 1, but the stability is slightly worse.

[0050] The above examples illustrate the performance of the green solvent provided by the present invention at different ratios. By adjusting the amount of each component, the dissolving ability, stability and cost can be effectively balanced to meet the specific needs of different fields.

[0051] To further verify the effect of the present invention, more specific embodiments and performance test data are provided below.

[0052] Example 4

[0053] Formulate the new green solvent of ethylene glycol by weight percentage:

[0054] Ethylene glycol: 60%

[0055] Acetamide: 25%

[0056] Ethylene glycol ether: 10%

[0057] Water: 5%

[0058] The preparation method is the same as that in Example 1. The obtained solvent was tested and the results are as follows:

[0059] 1. Solubility test: The solubility in organic compounds such as benzene, toluene, ethyl acetate, and dichloromethane is significantly better than that of pure ethylene glycol;

[0060] 2. Thermal stability test: After heating at 150°C for 4 hours, the composition and properties of the solvent did not change significantly;

[0061] 3. Biodegradability test: within 28 days, the degradability rate reaches 82%.

[0062] Example 5

[0063] Formulate the new green solvent of ethylene glycol by weight percentage:

[0064] Ethylene glycol: 70%

[0065] Acetamide: 15%

[0066] Ethylene glycol ether: 10%

[0067] Water: 5%

[0068] The preparation method is the same as that in Example 1. The obtained solvent was tested and the results are as follows:

[0069] 1. Solubility test: Good solubility for inorganic salts such as sodium chloride and copper sulfate;

[0070] 2. Thermal stability test: After heating at 120°C for 6 hours, the composition and properties of the solvent did not change significantly;

[0071] 3. Toxicity test: LD50 (rat oral)>4500mg / kg, meeting the low toxicity requirements.

[0072] Extended application analysis

[0073] The new green ethylene glycol solvent provided by the present invention has broad application prospects in the fields of chemical industry, pharmaceuticals, coatings, cleaning, etc. By adjusting the formula of the new green ethylene glycol solvent, the solubility and stability can be optimized according to different application requirements. For example, in the pharmaceutical field, it can be used to dissolve active ingredients of drugs and improve the solubility and bioavailability of drugs; in the coating field, it can be used to prepare environmentally friendly coatings and reduce the emission of volatile organic compounds; in the cleaning field, it can be used to prepare environmentally friendly detergents to reduce harm to the environment and human body.

[0074] In summary, the present invention provides a new green solvent with ethylene glycol as the main component and a preparation method thereof. The new green solvent of ethylene glycol is based on low-toxic and degradable ethylene glycol, and the addition of a co-solvent greatly improves the solubility, and can dissolve a variety of organic substances and inorganic salts. At the same time, it has excellent chemical stability, thermal stability and environmental friendliness. By adjusting the raw material ratio, solubility, stability and cost can be balanced to meet the application requirements of different fields. The invention provides a green and environmentally friendly alternative to traditional toxic solvents and has broad application prospects.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A new green solvent of ethylene glycol, characterized in that: The invention comprises the following raw materials in parts by weight: Ethylene glycol: 50-80 parts; Acetamide: 10-30 parts; Ethylene glycol ether: 5-15 parts; Water: 5-15 parts.

2. A method for preparing a new green solvent of ethylene glycol, characterized in that: The following steps are involved: S100, mix ethylene glycol and acetamide, heat to 60-80°C, and stir evenly; S200, add ethylene glycol ether and continue stirring for 30 minutes; S300, cool to room temperature, add water, and continue stirring for 15 minutes to obtain a new green solvent of ethylene glycol.

3. The method for preparing the new green solvent of ethylene glycol according to claim 2, characterized in that: The weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the total weight of the new green ethylene glycol solvent are 65%, 20%, 10% and 5% respectively.

4. The method for preparing the new green solvent of ethylene glycol according to claim 2, characterized in that: The weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the total weight of the new green ethylene glycol solvent are 75%, 15%, 5% and 5% respectively.

5. The method for preparing the new green solvent of ethylene glycol according to claim 2, characterized in that: The weight percentages of ethylene glycol, acetamide, ethylene glycol ethyl ether and water in the total weight of the new green ethylene glycol solvent are 55%, 25%, 15% and 5% respectively.