A benzyl triethyl eutectic solvent, its preparation method and application in extracting iodine
By preparing benzyltriethyl eutectic solvent to form hydrogen bonds with iodine, the problem of efficient iodine extraction in nuclear energy production was solved, achieving efficient, low-cost, and environmentally friendly iodine extraction.
Patent Information
- Application Number
- CN202410065951.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2044-01-17
AI Technical Summary
Existing technologies are difficult to efficiently and economically capture and stably store easily sublimable radioactive nuclear waste iodine (129I and 131I) generated during nuclear energy production, and traditional extractants are costly and complex to operate.
Benzyltriethyl eutectic solvent was used as the extractant to form hydrogen bonds with iodine. Iodine was prepared by stirring and extracted under constant temperature conditions to form a homogeneous and transparent liquid, thus achieving efficient extraction of iodine.
It achieves high-efficiency iodine extraction and low cost, conforms to the concept of green environmental protection, simplifies the operation process, and reduces the production cost of the extractant.
Smart Images
Figure SMS_1 
Figure QLYQS_1 
Figure HDA0004668098610000011
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of deep eutectic solvents, in particular to a benzyl triethyl deep eutectic solvent and its application in extracting iodine. BACKGROUND
[0002] Nuclear energy is a new energy that can replace traditional energy because it has no carbon emissions in production and use. However, nuclear waste such as iodine (I) is produced in the production process of nuclear energy. 129 I and 131 I) is a radioactive nuclear waste that is easy to sublimate and has a long half-life, which directly harms the human immune system. Therefore, it is crucial to explore effective extractants to achieve rapid and efficient capture and stable storage of iodine.
[0003] Deep eutectic solvents are a kind of "ionic liquid-like" composed of hydrogen bond acceptors and hydrogen bond donors in different proportions. In addition to the characteristics of ionic liquids such as low vapor pressure, non-volatility, and good thermal stability, they also have the characteristics of simple synthesis operation, low raw material cost, and high atomic utilization rate. They can be applied to more fields and are also attracting more attention from researchers.
[0004] Deep eutectic solvents can form hydrogen bonds with iodine and successfully extract and separate iodine from organic solvents. Based on experience and experiments, the most cost-effective, simplest operation, and best extraction effect deep eutectic solvent can be designed to maximize economic benefits. SUMMARY
[0005] To solve the above problems, the present application provides a benzyl triethyl deep eutectic solvent and its application in extracting iodine. The method is simple to operate and has excellent results.
[0006] The technical solution adopted by the present application is: a benzyl triethyl deep eutectic solvent, which has a structural formula as shown in (I):
[0007]
[0008] (I)
[0009] A preparation method of a benzyl triethyl deep eutectic solvent, comprising the following steps: mixing benzyl triethyl ammonium chloride and acetic acid and then stirring to react until a uniform transparent liquid is formed, and then vacuum drying to obtain the target product.
[0010] Further, the molar ratio of benzyl triethyl ammonium chloride to acetic acid is 1:2.
[0011] Further, the stirring reaction time is 2-3 h.
[0012] The application provides application of a benzyl triethyl eutectic solvent in extraction of iodine.
[0013] Further, the method is as follows: the benzyl triethyl eutectic solvent is placed in an organic solvent solution containing iodine, and iodine is extracted under constant temperature and stirring conditions.
[0014] Further, the mass ratio of the benzyl triethyl eutectic solvent to the organic solvent solution containing iodine is 1:1-3.
[0015] Further, in the organic solvent solution containing iodine, the concentration of iodine is 0.1-0.3 g / L.
[0016] Further, the constant temperature is 60 DEG C.
[0017] The application has the following beneficial effects:
[0018] 1. The benzyl triethyl eutectic solvent is used as an extractant in extraction of iodine, the synthesis operation of the benzyl triethyl eutectic solvent is simple, and the benzyl triethyl eutectic solvent is low in price.
[0019] 2. The benzyl triethyl eutectic solvent is used as an extractant in extraction of iodine, the selected benzyl triethyl eutectic solvent can form a hydrogen bond with iodine, iodine can be successfully extracted from an organic solvent, and the extraction rate is high.
[0020] 3. The benzyl triethyl eutectic solvent is used as an extractant in extraction of iodine, which is conducive to the concept of green environmental protection, and is more conducive to the life and survival of humans, animals and plants. DRAWINGS
[0021] Figure 1 It is a nuclear magnetic resonance hydrogen spectrum diagram of the benzyl triethyl eutectic solvent of example 1.
[0022] Figure 2 It is an infrared spectrum diagram of the benzyl triethyl eutectic solvent of example 1. DETAILED DESCRIPTION
[0023] The application will be further described through specific examples. The application is not limited to example 1, and is also suitable for other eutectic solvents, and can have slight changes without departing from the scope.
[0024] Example 1: a benzyl triethyl eutectic solvent
[0025] (I) the preparation method is as follows:
[0026] Benzyl triethylammonium chloride (BETAC) with structural formula (II) was vacuum dried at 60 ℃ according to the molar ratio of benzyl triethylammonium chloride: acetic acid = 1:2. After mixing the dried benzyl triethylammonium chloride and acetic acid (AC) with structural formula (III), the mixture was stirred for 2-3 h until a uniform transparent liquid was formed. The obtained product was vacuum dried at 60 ℃ to obtain the target product benzyl triethyl eutectic solvent (BETAC-AC).
[0027]
[0028] (II) (III)
[0029] (II) (III)
[0030] (1) Nuclear magnetic resonance hydrogen spectrum: nuclear magnetic resonance hydrogen spectrum of benzyl triethyl eutectic solvent 1 H NMR characterization (300 MHz, solvent DMSO-d6) is shown in the following figure: Figure 1 The analysis of the nuclear magnetic resonance hydrogen spectrum shows that 1 The chemical shift and the number of resonance peaks and the integral area of H NMR are consistent with the chemical shift and the number of resonance peaks and the integral area of the target eutectic solvent, and no impurity peak is found.
[0031] (2) Infrared spectrum: infrared characterization of benzyl triethyl eutectic solvent is shown in the following figure: Figure 2 The analysis of the infrared spectrum shows that the infrared spectrum of the eutectic solvent contains both the characteristic peaks of the hydrogen bond acceptor (benzyl triethylammonium chloride) and the characteristic absorption peaks of the hydrogen bond donor (acetic acid), and no new characteristic peaks are produced, indicating that no new substances are produced by chemical reaction between benzyl triethylammonium chloride and acetic acid, but only by hydrogen bond interaction.
[0032] Example 2: Application of a benzyl triethyl eutectic solvent as an extractant in the extraction of iodine
[0033] (I) Extraction separation experiment
[0034] A certain amount of iodine was dissolved in cyclohexane to prepare an iodine-containing cyclohexane solution with an iodine concentration of 0.2 g / L, which was prepared for use.
[0035] 1 g of benzyl triethyl eutectic solvent was weighed into a 10 mL graduated test tube, and 2 g of iodine-containing cyclohexane solution was added. The extraction separation experiment of iodine was carried out at 60 ℃ under magnetic stirring.
[0036] After extraction for 60 min, the system was allowed to stand for 2 h. The concentration of iodine in the cyclohexane phase at a wavelength of 523 nm was measured using UV-visible spectrophotometry. The average of three measurements was taken, with a relative error controlled within 3% to ensure the accuracy of the data.
[0037] The extraction efficiency E (%) of iodine was calculated according to the following formula (1-1):
[0038] E (%) = [( C 0- C f ) / C 0] × 100 (1-1)
[0039] wherein, C 0 represents the initial concentration of iodine in the iodine-containing cyclohexane solution, C f and
[0040] After the extraction of benzyltriethyl eutectic solvent, it was calculated that the extraction efficiency of benzyltriethyl eutectic solvent for iodine was 95.1%.
Claims
1. Use of a benzyltriethyl deep eutectic solvent as an extractant in the extraction of iodine, characterized in that, The benzyl triethyl deep eutectic solvent has a structural formula as shown in (I). （Ⅰ）。 2. Use according to claim 1, characterized in that, The preparation method of the benzyl triethyl deep eutectic solvent comprises the following steps: mixing benzyl triethyl ammonium chloride and acetic acid and then stirring and reacting until a uniform transparent liquid is formed, and vacuum drying to obtain the target product.
3. Use according to claim 2, characterized in that, The molar ratio of benzyl triethyl ammonium chloride to acetic acid is 1:
2.
4. Use according to claim 2, characterized in that, The stirring reaction time is 2-3 h.
5. The use according to claim 1, characterized in that, The method is as follows: the benzyl triethyl deep eutectic solvent is placed in an iodine-containing organic solvent solution, and the iodine is extracted under constant temperature and stirring.
6. Use according to claim 5, characterized in that, The mass ratio of the benzyl triethyl deep eutectic solvent to the iodine-containing organic solvent solution is 1:1-3.
7. Use according to claim 5, characterized in that, The concentration of iodine in the iodine-containing organic solvent solution is 0.1-0.3 g / L.
8. Use according to claim 5, characterized in that, The constant temperature is 60 DEG C.