Temperature Control of Exothermic Reactions Using n-Octadecane@MF Resin microPCMs Based on Esterification Reactions
Abstract
:1. Introduction
2. Preparation and Characterization of the microPCMs
2.1. Experimental Materials
2.2. Preparation of Encapsulated n-Octadecane with MF Resin Shell
2.3. Chemical Characterization and Morphology of microPCMs
2.4. Thermal Properties and Thermal Stability of microPCMs
3. Temperature Control Experiments
3.1. Reaction Scheme
3.2. Experimental Materials
3.3. Experimental Procedures
3.3.1. Experimental Equipment
3.3.2. Experimental Process
4. Result and Discussion
4.1. Experimental Results
4.2. Effect of the Amount of microPCMs on Temperature Control
4.3. Effect of the Addition Temperature of microPCMs
5. Conclusions
- (1)
- The temperature control effect of microPCMs on exothermic reaction is related to the addition amount. Maximum temperature of the reaction system declined by 5.06 °C, 11.24 °C, 16.00 °C, and 22.01 °C when 2g, 4g, 5g, and 5.5g of microPCMs was added into the reactor at the temperature of 39 °C, respectively. Meanwhile, at the addition temperature of 46 °C, the maximum temperature declined by 6.40 °C, 10.52 °C, 13.70 °C, and 23.43 °C when the same amounts of microPCMs were added.
- (2)
- For an exothermic reaction, the temperature control effect of microPCMs becomes better with the increase of addition temperature. When 2 g, 4 g, 5 g, and 5.5 g of microPCMs was added at the temperature of 39 °C, the temperature of the reaction system continued to rise by 23.30 °C, 17.07 °C, 12.36 °C, and 6.35 °C, respectively, before it began to decline. In comparison, the temperature of the reaction system continued to rise by 14.96 °C, 10.84 °C, 7.66 °C, and 3.33 °C, respectively, while the addition temperature increased to 46 °C. At the temperature of 53 °C, even 2 g of microPCMs could effectively control the reaction temperature.
- (3)
- The effect mechanism of n-octadecane@MF resin microPCMs on the temperature control of a semi-batch esterification reaction system is the combination of both physical and chemical actions. The physical action is mainly reflected in the heat exchange between the microPCMs and the reaction system and the melting endothermic of the core material. The chemical reaction is caused by the anion exchange between the MF resin and anion in the reaction system, which could absorb the catalyst so as to suspend the reaction processes.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Experimental Materials | CAS No. | Molecular Formula | Weight (wt.%) | Source |
---|---|---|---|---|
n-octadecane | 593-45-3 | C18H38 | ≥99.0 wt.% | Aladdin Reagent (Shanghai, China) |
Melamine | 1058-78-1 | C3H6N6 | ≥99.0 wt.% | Aladdin Reagent (Shanghai, China) |
Ethanol | 64-47-5 | C2H6O | ≥99.7 wt.% | Ya Sheng Chemical (Wuxi, China) |
Formaldehyde solution | 50-00-0 | CH2O | 36 wt.%~38wt.% | Xi Long Scientific (Shantou, China) |
TA | --- | --- | ≈19 wt.% | Rui Gong Chemical Reagent (Shanghai, China) |
Triton X-100 | 9002-93-1 | C34H62O11 | ≥95.0 wt.% | Sinopharm Chemical Reagent (Shanghai, China) |
Sodium hydroxide | 1310-73-2 | NaOH | ≥99.0 wt.% | Sinopharm Chemical Reagent (Shanghai, China) |
Anhydrous Citric acid | 77-92-9 | C6H8O7 | ≥99.5 wt.% | Sinopharm Chemical Reagent (Shanghai, China) |
Distilled water | 7732-18-5 | H2O | --- | Wan Qing Glass & Instrument (Nanjing, China) |
Sequence Number | ① | ② | ③ | ④ | ⑤ | ⑥ | ⑦ | ⑧ | ⑨ | ⑩ | ⑪ |
Peak position (cm−1) | 717 | 1470 | 2849 | 2915 | 2960 | 810 | 1010 | 1160 | 1347 | 1568 | 3400 |
Sample | Tm (°C) | ΔHm (J/g) | Encapsulation Ratio (%) | Char Yield at 800 °C |
---|---|---|---|---|
n-octadecane | 27.28 | 230.2 | --- | 0.19% |
microPCMs | 27.47 | 159.3 | 69.2 | 4.88% |
Experimental Materials | CAS No. | Molecular Formula | Weight (wt.%) | Source |
---|---|---|---|---|
Propionic anhydride | 123-62-6 | C6H10O3 | ≥97.0 wt.% | Aladdin Reagent (Shanghai, China) |
2-Butanol | 78-92-2 | C4H10O | ≥95.0 wt.% | Sinopharm Chemical Reagent (Shanghai, China) |
Sulfuric acid | 7664-93-9 | H2SO4 | ≥98.0 wt.% | Ling Feng Chemical Reagent (Shanghai, China) |
microPCMs | --- | --- | --- | Laboratory made |
Test | Addition Temperature (°C) | Addition Amounts (g) | Maximum Temperature of Reactor (°C) |
---|---|---|---|
E0 | --- | 0 | 67.36 |
E1 | 39 | 2 | 62.30 |
E2 | 39 | 4 | 56.07 |
E3 | 39 | 5 | 51.36 |
E4 | 39 | 5.5 | 45.35 |
E5 | 39 | 6 | 41.59 |
E6 | 39 | 8 | 40.18 |
E7 | 46 | 2 | 60.96 |
E8 | 46 | 4 | 56.84 |
E9 | 46 | 5 | 53.66 |
E10 | 46 | 5.5 | 49.33 |
E11 | 46 | 6 | 47.22 |
E12 | 46 | 8 | 47.40 |
E13 | 53 | 2 | 53.51 |
E14 | 53 | 4 | 53.95 |
E15 | 53 | 6 | 54.03 |
E16 | 53 | 8 | 54.16 |
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Li, C.; Ni, L.; Chen, Q.; Jiang, J.; Zhou, K. Temperature Control of Exothermic Reactions Using n-Octadecane@MF Resin microPCMs Based on Esterification Reactions. Processes 2022, 10, 239. https://doi.org/10.3390/pr10020239
Li C, Ni L, Chen Q, Jiang J, Zhou K. Temperature Control of Exothermic Reactions Using n-Octadecane@MF Resin microPCMs Based on Esterification Reactions. Processes. 2022; 10(2):239. https://doi.org/10.3390/pr10020239
Chicago/Turabian StyleLi, Chenghao, Lei Ni, Qiang Chen, Juncheng Jiang, and Kuibin Zhou. 2022. "Temperature Control of Exothermic Reactions Using n-Octadecane@MF Resin microPCMs Based on Esterification Reactions" Processes 10, no. 2: 239. https://doi.org/10.3390/pr10020239
APA StyleLi, C., Ni, L., Chen, Q., Jiang, J., & Zhou, K. (2022). Temperature Control of Exothermic Reactions Using n-Octadecane@MF Resin microPCMs Based on Esterification Reactions. Processes, 10(2), 239. https://doi.org/10.3390/pr10020239