CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Fen Liu,Jingcong Zhang,Wenxuan Bai,Jinxiang Chen,Zhiping Gu,Jiang Yu
To reduce the energy consumption of regeneration for HCl absorption, and to recover HCl to high-value products, a sustainable phase-change system was constructed with N-methyldiethanolamine (MDEA) and polyethylene glycol dimethyl ether (NHD) in this paper. The MDEA/NHD phase change absorbent for HCl absorption is optimized by the ternary phase diagram and phase behavior of MDEA/NHD/HCl system. The results demonstrate that the biphasic system can be constructed with the mass fraction of HCl less than 28% and NHD component in the range of 23.0% ∼ 95.3%. Because of the higher stability of protonated MDEA·HCl than that of NHD·HCl, HCl molecules are mainly enriched in MDEA phase containing the volume ratio of less than 1/3 and partition coefficient over 100 at the neutral point. Therefore, only MDEA phase needs to be recycled, which results in reducing the circulation of regeneration by approximately 68%. Moreover, concentrated HCl in anhydrous MDEA phase could further prevent the side reaction of OER and improve the Faradaic efficiency toward HER and CER to reach 98.5% and 90.5% at 55 °C, respectively. And the energy consumption of regeneration is reduced to 0.37 GJ/t(absorbed HCl) in MDEA/NHD biphasic absorbent compared with that of 2.3 GJ/tCO 2 by DMX™ phase change absorption for CO 2 . By enhancing the conductivity and decreasing the viscosity of MDEA phase, introducing water in MDEA/NHD/HCl solution within 5% could significantly promote the current density and maintain high Faradaic efficiency toward HER and CER as 89.0% and 86.8%, respectively. Therefore, it is a promising technology to be applied in industry.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 94
·期 5
·1474-1479
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IF 2.587
Yuqiang Zhang,Jun Li,Yang Jin,Ming Chen,Defang Yu
BACKGROUND Over the past few decades, tri-n-butyl phosphate (TBP) has been a widely used and irreplaceable extractant that can extract a variety of heavy metal ions and inorganic acids. The conventional process of tri-n-butyl phosphate synthesis has the problem of low yield. The in situ vapor stripping method was developed to intensify the tri-n-butyl phosphate synthesis reaction. RESULTS In this work, the coupling process of in situ vapor stripping and reaction was proposed for the first time in the process of synthesis of TBP. It was found that the reaction of high concentration hydrogen chloride and 1-butanol would produce water, which resulted in increasing the possibility of side reactions, especially when the temperature was higher than 55 °C. In the lower temperature range, n-pentane was selected as the stripping medium, which effectively removed hydrogen chloride from the reaction system by in situ vapor stripping. The FT-IR analysis confirmed that TBP can be synthesized successfully by the vapor stripping process. In addition, the effects of n-pentane volume, temperature and stripping time on the yield of TBP and the amount of hydrogen chloride stripped were investigated. By applying the optimum reaction conditions, the yield of TBP was increased to 94%, larger than that of the current industrial process whose yield is only 80%. CONCLUSION The in situ vapor stripping process is demonstrated to be an effective method for intensification of the esterification process in TBP synthesis. It can be used for other reactions which generate volatile gases as the byproduct. © 2018 Society of Chemical Industry
研究领域:
化学工程
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工业化学
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 1
·597-603
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IF 2.206
Xu Xiaopeng,Chen Si,Wu Bozhen,Ma Meng,Shi Yanqin,Wang Xu
The influence of allantoin (ALL) combined with zinc stearate (ZnSt 2 ), calcium stearate (CaSt 2 ), and ZnSt 2 –CaSt 2 (1:1), respectively, in different mass ratios on thermal stability of poly(vinyl chloride) (PVC) was investigated by Congo red test, discoloration test, and thermogravimetric analysis. The results indicated that ALL behaved as a good long-term thermal stabilizer for PVC, which was attributed to its ability to absorb hydrogen chloride released from the degradation of PVC. Moreover, ALL was able to extend the stabilization time of PVC containing ZnSt 2 –CaSt 2 and postpone “zinc burning.” Fourier transform infrared spectra confirmed that ALL can react with ZnCl 2 to produce an inert complex, which is responsible for postponing “zinc burning.”
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2018
·
IF 3.193
Mei Wang,Xianghai Song,Jianchun Jiang,Jianling Xia,Mei Li
A zeolitic imidazolate framework material (ZIF-8) was prepared from stoichiometric zinc nitrate and 2-methylimidazole at room temperature in the presence of ammonium hydroxide . The material was characterized by a series of methods and used as a thermal stabilizer for poly (vinyl chloride) (PVC) film. The properties of the stabilized PVC were investigated using Congo red test, thermal aging test and thermal gravimetric analysis (TGA). Compared with the stabilizing efficiencies of some commonly-used reference stabilizers (e.g. CaSt 2 and ZnSt 2 ), the stabilizers including ZIF-8 [such as CaSt 2 /ZnSt 2 /ZIF-8 and ZnSt 2 /ZIF-8] exhibit better initial color stability and long-term thermal stability for PVC. The static thermal stability time was significantly prolonged from 33.13 min for PVC/CaSt 2 /ZnSt 2 to about 128.92 min for PVC/ZIF-8/ZnSt 2 at 180 °C. The superior performance is attributed to the synergistic effect of ZIF-8 and ZnSt 2 . The imidazole ligand of ZIF-8 can strongly absorb hydrogen chloride and form complexes with ZnCl 2 generated from ZnSt 2 in the PVC degradation process. In addition, the double bonds of ZIF-8 may help to form stable compounds with polyenes to further retard the PVC degradation. Dynamic mechanical and tensile properties of the PVC films were also studied.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 9
·1468-1479
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IF 3.046
Ming Duan,Gang Wu,Tianbin Gu,Xiaohui Jiang,Lei Zhao,Limei Zhou,Yunwen Liao,Qiang Pu
Present work reports a new type of poly( N -alkyl-2-[4-hydroxybut-2-ynyl] pyridinium bromides) (designated as Po-n, n = 8, 12, 16 of carbon atoms in the alkyl chain). Po-n were synthesized and characterized by FTIR, GPC, and NMR analysis. The possible polymerization mechanism was proposed and supported by theoretic calculation. A preliminary probe was performed on the conductivity and anticorrosive ability of the conjugated polymer. The results showed that these polymers demonstrated poor conductivity, however the conductivity was enhanced by graphene doping. Po-n are good inhibitors for X70 steel corrosion in HCl solution. So, the conjugated polymers may play important roles in the fields of optoelectronic devices and steel corrosion inhibition. Graphical
研究领域:
材料化学
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腐蚀科学
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高分子化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Min Zheng,Mingzhen Shi,Xingbang Hu,Zhuoheng Tu,Youting Wu
Efficient separation and recovery of hydrogen chloride (HCl) from HCl tail gas containing impurities such as sulfur dioxide (SO 2 ) is very important from the viewpoint of economy and environment. However, due to the similar dissolution ability of SO 2 and HCl , most solvents, including organic solvents, ionic liquids and deep eutectic solvents (DESs), show low SO 2 /HCl selectivity near 1.0 and are thus incompetent to separate SO 2 /HCl. To address this, we firstly reported the task-specific design of a novel class of protic metal-based DESs (PM-DESs) containing hydrochloride, metal chloride and sulfolane, which have good SO 2 affinity but much inhibited HCl uptake, for the separation of HCl/SO 2 . The solubility data of SO 2 and HCl in PM-DESs were determined and correlated by Krichevsky-Пiinskaya (K-I) equation. Among these PM-DESs, N,N -dimethylaniline hydrochloride (DMA·HCl) + zinc chloride (ZnCl 2 ) + sulfolane exhibits satisfactory recyclability and selectivity up to 2.669 (100 kPa, 313.2 K), which is the highest value reported so far. Absorption of HCl/SO 2 (50/50) mixed gas was also tested, with a high SO 2 /HCl selectivity of 3.250 obtained. In addition, the NMR and FTIR spectroscopic characterizations paired with quantum chemistry calculation were utilized to investigate the absorption mechanism from the perspective of atomic level. The DESs developed in the present work have the potential to separate and recycle HCl from SO 2 owing to their good selectivity and desirable reversibility, and the strategy proposed in this work may offer new guidance for designing green media for HCl recovery.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2019
·Vol. 92
·期 6
·848-856
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IF 0.508
Lv Jie,Fu Luoping,Zeng Bo,Tang Mingjin,Li Jianbo
In this paper, citric acid was used as carbon source, diethylenetriamine and urotropine were used as precursors, and N-doped carbon dots (cdh-CDs) with luminescent properties were synthesized by microwave method. The structure of the sample was analyzed by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffractometry (XRD), ultraviolet spectrophotometer (UV), fluorescence spectroscopy, etc., and it was proved that cdh-CDs with an amorphous structure about 4–10 nm in diameter was synthesized. The corrosion inhibition performance of cdh-CDs in 1 M hydrochloric acid was evaluated by static weight loss and electrochemical method. The results showed that cdh-CDs have a good corrosion inhibition performance at 60°C, the inhibition efficiency can reach 81.2% when the dosage is 600 ppm. Electrochemical results showed that cdh-CDs are mixed inhibitors which mainly inhibit cathodes.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lei Xing,Jieru Bao,Shiyu Zhou,Yulong Qiu,Hongji Sun,Shuai Gu,Jianguo Yu
Poor economics is the principal factor that hinders the commercialization of hydrometallurgy processing of spent lithium-ion batteries cathode materials. Here, ultra-fast leaching of spent cathode materials (97.72% Li and 97.25% Co leached under S/L ratio: 10 g/L, temperature: 363 K within 10 min) was achieved in 0.5 M hydrochloric acid and 0.5 M L -ascorbic acid system as part of reducing the costs of hydrometallurgy process. The correlations of both acids with the leaching ratios were studied for the first time with the Pearson correlation coefficient. The mixture of 0.5 M hydrochloric acid and 0.5 M L -ascorbic acid demonstrated both faster kinetics and higher leaching volume than those of aqua regia. Adopting quantum chemistry and thermodynamic calculations, four hypothetical mechanisms were proposed to interpret the reaction mechanisms. Synergy-coordination, with the lowest energy, was considered to be the most reasonable mechanism for the leaching of cathode materials. Three scenarios with different leaching systems and conditions were compared to identify the key parameters determining the economics of the leaching process.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Siyu Li,Jiali Yao,Dayang Wang,Keke Huang,Wensheng Yang,Renguo Xie
Metal halides (MHs), specifically CsPbX3 (where X = Cl and Br), have garnered significant research interest due to excellent optoelectronic properties. However, most of these metal halides exhibit no red emission in the visible region. In this study, Cs2ZnCl4 powders in the presence of hydrochloric acid were synthesized through mechanical milling. X-ray diffraction (XRD) analyses revealed no detectable diffraction signals before or after acid treatment, suggesting a uniform crystal structure. The initial Cs2ZnCl4 powders displayed intrinsic blue emission centered at 486 nm, with a Photoluminescence Quantum Yield (PLQY) of approximately 5.07%. In contrast, the hydrochloric acid-treated Cs2ZnCl4 powder exhibited bright red emission centered at 645 nm, with a PLQY of about 12.78%. The broad emission, characterized by a full width at half maximum (FWHM) of 135 nm, was attributed to self-trapped exciton (STE) emission. X-ray photoelectron spectroscopy (XPS) analysis of Cs2ZnCl4 before and after acid treatment suggests that hydrochloric acid introduction may have induced distortions or defects in the coordination environment of Zn2+ ions. This provides a valuable route for further investigation into the optical properties of other metal halides.
研究领域:
材料科学
·
光学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·Vol. 49
·期 35
·15448-15456
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IF 2.5
Dalong Zheng,Yuchun Tan,Xin Song
Chemical modification is a critical method to improve the properties and structures of catalysts, which remains challenging. In this study, a series of Cu–Al catalysts were prepared by a hydrothermal synthesis method for hydrogen sulphide (H2S) and phosphine (PH3) removal at 80 °C, and the role of metal complexes and acid were discussed in detail. Results showed that the HCl-treated CuAlOx catalyst with the molar ratio of Cu : Al : HCl = 5 : 5 : 1 exhibited the highest performance among all the materials tested, corresponding to capacities of 37.25 mgS g−1 for sulfur and 64.15 mgP g−1 for phosphorus. The catalysts were characterized by X-ray diffraction, Brunauer–Emmett–Teller analysis, X-ray photo electron spectroscopy, scanning electron microscopy, transmission electron microscopy, inductively coupled plasma, and in situ IR. Results showed that HCl was able to expose more active sites and expand the catalyst channel by speciation generation and structural corrosion. Cu+ species was the most important constituent in the catalyst. It was derived from the reduction of Cu2+ species, facilitated by the provision of additional electrons from Cl ions and H2 in the thermal treatment process. Metal coordination promoted the interaction of metal crystal faces, which offered more advantages in pollutant removal than single copper or aluminum. Pollutant molecules were vertically adsorbed on the Cu+ species to generate sulfur species and phosphorus species with the help of oxygen species and active sites. Subsequently, the products rapidly shifted to the surface of the catalyst and occupied the active sites and vacancies, resulting in inactivation. The strategy of metal coordination and acid treatment is an important approach that provides possibilities for enhanced catalytic performance in various applications.
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高影响因子
Small
·
2012
·Vol. 8
·期 11
·1710-1716
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IF 8.349
Bo Li,Ran Long,Xiaolan Zhong,Yu Bai,Zijie Zhu,Xing Zhang,Min Zhi,Jiawei He,Chengming Wang,Zhi-Yuan Li,Yujie Xiong
Particle size is one important parameter of nanocrystals that need to be tightly controlled, owing to its versatility for tailoring the properties and functions of nanocrystals towards various applications. In this article, oxidative etching by hydrogen chloride is employed as a tool to control the size of metallic nanocrystals. As a result of the size control, investigations into the size-dependent plasmonic and catalytic properties of metallic nanocrystals can be investigated. Given that the shape can be kept consistent when tuning the particle size in this system, it enables the systematic investigation of size-dependent properties free of the influence of other factors such as shape effect.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）