JOURNAL OF CRYSTAL GROWTH
·
2019
·
IF 1.573
Zheng Li,Dong-Liang Zhong,Wei-Yan Zheng,Jin Yan,Yi-Yu Lu,Da-Tong Yi
This work presents a morphological and kinetic investigation of tetra- n -butyl ammonium bromide (TBAB) or tetra- n -butyl phosphonium bromide (TBPB) semiclathrate hydrates formed with a CO 2 + CH 4 gas mixture at the stoichiometric concentration (2.57 mol%). A 3-stage procedure was proposed and employed in the experiments. All experiments were performed at 2.8 MPa and a subcooling of 12 K was used as driving force for hydrate nucleation and growth. It was found that the shapes of hydrate crystals formed in TBPB and TBAB solutions were quite different. Besides, the TBPB semiclathrate hydrate grew laterally at gas/liquid interface and quickly covered the interface while the TBAB semiclathrate hydrate initially formed around the gas/liquid interface and then sank to the reactor bottom. As a consequence, gas uptake and the rate of hydrate growth obtained in TBAB solutions were higher than that in TBPB solutions. It was also found that CO 2 content in hydrate phase, CO 2 recovery, and separation factor obtained in TBAB solutions were higher than those obtained in TBPB solutions. Therefore, TBAB semiclathrate hydrate formed at the stoichiometric concentration and quiescent conditions will be a promising approach to improve the hydrate based CO 2 separation from the CO 2 + CH 4 gas mixture.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2025
·
IF 1.6
Luping Gu,Cun Wang,Lei Ni,Zhiquan Chen,Danfeng Zhang,Juncheng Jiang,Yuanyuan Wang
To suppress thermal runaway during the synthesis process of tert -butyl peroxybenzoate (TBHB), phase change microcapsules (microPCMs) were prepared using paraffin as the core material and melamine-formaldehyde resin (MF) as the wall material via in situ polymerization. When the emulsification time was 20 min, the reaction temperature was 80 °C, and the paraffin mass was 10 g, the characterization of SEM, Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and x-ray photoelectron spectroscopy (XPS) confirmed that the microPCMs were successfully fabricated, with microcapsule encapsulation rate reaching 62.5 %. The investigation into the thermal runaway suppression effect of microPCMs during the synthesis of TBPB revealed that adding 5 g of microPCMs at 50 °C optimized overtemperature suppression, reducing the maximum temperature of the reaction system from 58.3 °C to 50.3 °C. This work expands the application of microPCMs in semi-batch reactions and has significant implications for the prevention of thermal runaway incidents.
研究领域:
材料科学
·
化学工程
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
Sustainability
·
2024
·Vol. 16
·期 19
·8568
·
IF 3.3
Yuan-Yuan Wang,Dan-Feng Zhang,Hong-Rui Zhang,Wen-Jun Liu,Zhi-Quan Chen,Jun-Cheng Jiang,Lei Ni
In this study, sodium dodecylbenzene sulfonate was used as a stabilizer, and NaOH, TBHP, and benzoyl chloride were used as reactants in the preparation of tert–butyl peroxybenzoate (TBPB) using a two–step process. The process conditions were optimized by a three–factor, three–level Box–Behnken design approach. The results showed that the yield of TBPB achieved 88.93% under the optimum conditions of temperature of 31.50 °C, feeding time of 22.00 min, and NaOH concentration of 15%. The exothermic properties of the synthesis of TBPB were investigated using reaction calorimetry. The thermal decomposition characteristics of reactants and products were analyzed by differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC), and the changes in substance types, characteristic peaks, and exothermic quantities during the reaction were analyzed before and after the reaction by FTIR. The reaction mechanism was proposed by combining EasyMax 102, RC1e, gas chromatography (GC), and Fourier transform infrared spectrometry (FTIR). A comprehensive study of the reaction mechanism and reaction exotherm was carried out using density functional theory (DFT) to predict the reaction energy change and the direction of the reaction and to determine whether the reaction was reversible or not. The risk level for the synthesis of TBPB in semi–batch mode was evaluated using a risk matrix and the Stoessel criticality diagram. The optimal conditions for the TBPB synthesis process in a plate microreactor were explored. Both microreactors and semi–batch modes were comparatively analyzed using the m–ITHI quantitative assessment method. The results indicated a hazard class 2 in semi–batch mode and a hazard class 1 in the microreactor. The results of the study may provide a reference for the further improvement of the intrinsically safe design of the synthetic TBPB process.
研究领域:
化学工程
·
过程安全
·
热分析
·
反应工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2017
·
IF 7.182
Zheng Li,Dong-Liang Zhong,Yi-Yu Lu,Jin Yan,Zhen-Lin Zou
This work presents an investigation of using tetra- n -butyl phosphonium bromide (TBPB) semiclathrate hydrate for CO 2 capture from simulated shale gas that is composed of 40% CO 2 and 60% CH 4 in mole fraction. The experiments were performed in a stirred tank reactor with the mass fraction of TBPB ( w TBPB ) varying from 5.0% to 33.2%. The phase equilibrium data of TBPB semiclathrate hydrate formed in the presence of the 40% CO 2 /CH 4 gas mixture were measured and reported. The effects of TBPB concentration on gas solubility, hydrate formation kinetics, and CO 2 separation efficiency were investigated in the temperature range of 278.1–284.2 K with the initial pressure fixed at 2.8 MPa. The results indicated that at a fixed driving force (overpressure), the gas uptake obtained at the induction time was nearly constant, despite the variation in TBPB concentration, while the rate of hydrate formation increased with the increase in TBPB concentration. Compared to the results obtained at a mole fraction of 1% THF, it was found that enhanced hydrate formation kinetics, a higher CO 2 separation factor (31.7 ± 3.3), and a higher operating temperature (284.2 K) were obtained at the stoichiometric TBPB concentration ( w TBPB = 33.2%). Therefore, TBPB may be used as a promising promoter for hydrate-based CO 2 capture from the simulated shale gas (CO 2 /CH 4 gas mixture).
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2018
·
IF 2.189
Jun-Cheng Jiang,Li Li,Jia-Jia Jiang,Yan Wang,Siu-Ming Lo,Yong Pan,Xu-Hai Pan,Lei Ni
Tert-butyl peroxybenzoate (TBPB) is thermally unstable organic peroxide, which may cause disasters such as fire or explosion when excessive heat released due to thermal decomposition. Ionic liquid is often used as a catalyst and inhibitor in engineering applications recently. This study investigated the thermal decomposition characteristics of TBPB when added two different ionic liquids which are 1-Propyl-3-methylimidazolium iodide ([PMIM][I]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]) respectively with different mass ratio under DSC tests. Characteristic parameters such as the onset exothermic temperature (T 0 ) and heat of decomposition (ΔH d ) of samples were compared. Kinetic parameters such as activation energy E a were computed using two isoconversional methods which were Ozawa method and Friedman method respectively. The model based (zeroth order reaction) estimation method was used to estimate TMR ad at T 0 from non-isothermal DSC measurements to assess the thermal hazard of five samples. The paper aims to study the effect of ionic liquids (ILs) on the thermal decomposition of TBPB and analysis the influence of two ionic liquids on the decomposition mechanism of TBPB.
研究领域:
化学工程
·
安全科学
✓ 已验证
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2026
·
IF 3.3
Andong Yu,Xuhai Pan,Funao Sang,Min Hua,Juncheng Jiang,Chi-Min Shu
Styrene polymerization is highly vulnerable to thermal runaway because of its strong exothermicity, viscosity increase, and deterioration of heat transfer during reaction. The thermal hazards of tert-butyl peroxybenzoate (TBPB) and TBPB-initiated styrene polymerization were investigated by differential scanning calorimetry (DSC), accelerating rate calorimetry (ARC), kinetic analysis, and Thermal Safety Software (TSS). The effects of TBPB dosage on runaway triggering, acceleration, and storage safety were evaluated using styrene/TBPB systems with mass ratios of 100:1, 100:2, and 100:10. Results showed that the addition of TBPB significantly increased the triggering sensitivity of styrene polymerization. Under adiabatic conditions, the exothermic onset temperature decreased from 105 °C for pure styrene to 75 °C for all TBPB-initiated systems. With increasing TBPB dosage, the time to maximum rate under adiabatic conditions (TMRad) decreased markedly, indicating a shorter intervention window during runaway development. Although the total heat release of the initiated systems changed only slightly, the high-dosage system exhibited more complex exothermic behavior, suggesting stronger coupling between initiator decomposition and styrene polymerization. TSS simulation further indicated that overheating could lead to severe runaway risk during storage and transportation. These results show that TBPB mainly reduces the thermal safety margin of styrene polymerization by lowering the runaway onset temperature and accelerating the runaway process.
✓ 已验证
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2018
·
IF 3.584
Juncheng Jiang,Fusheng Cui,Saili Shen,Xiuxia Guo,Lei Ni,Yong Pan
In this study, in order to assess thermal runaway risk of two step synthesis reactions, two new risk assessment methods were proposed by combining the new assessment procedure with the risk matrix and the Stoessel criticality diagram. The thermal runaway risks of the tert-butyl peroxybenzoate (TBPB) synthesis process and the tert-butyl peracetate (TBPA) synthesis process, and the influence of the use of the pure target products on the assessment results were also studied by the new methods. The results showed that the new methods could obtain more accurate assessment results of two step synthesis reactions. Some measures should be taken to reduce the thermal runaway risks of the two synthesis processes. Furthermore, the use of the pure target products in the new methods would exaggerate the thermal runaway risks of the two step synthesis reactions.
研究领域:
化学工程
·
安全科学
·
过程安全
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）