INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Tao Shen,Youqin Hu,Ruijia Hu,Wei Zhuang,Ming Li,Huanqing Niu,Hong Xu,Chenjie Zhu,Hanjie Ying
The continuous production of furfural using vaporization reactor as a continuous stirred tank reactor is reported in this study. 50 g L −1 xylose solution was continuous fed into the reactor and catalyzed by 2 wt% H 2 SO 4 at 433 K gave 82.3% average yield of furfural in 10 h of reaction time. Pulp prehydrolysate derives from prehydrolysis of wood biomass was further used as the raw material for the reaction, and the 78.6% average yield of furfural was achieved for 10 h. According to Aspen Plus simulation, 11.7 tons of saturated steam was required for the production of one ton of furfural under the present reaction system, which is almost half of the traditional one-step method.
研究领域:
生物化学工程
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可再生资源利用
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产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Yongli Li,Zhongwei Zhao
For more than a hundred years, extraction with ethyl ether has been the most used method for synthetizing H 3 PW 12 O 40 . However, the use of ethyl ether as the extraction agent faced many problems, such as strict regulation by public safety and environment authorities, poor operating environment, significant dissolution loss, low yields (approximately 80%), and difficulty in realizing continuous production. To overcome these problems, a new extraction method has been proposed in this paper, which uses 2-octanol as the extraction agent and water as the stripping agent. Under optimal conditions (30% 2-octanol in kerosene, O:A = 1:1, 180 g/L H 2 SO 4 , 20 g/L H 3 PO 4 , 45 °C, and a contact time of 2 min), 90.2% of H 3 PW 12 O 40 contained in the solution was extracted in a single stage; the loaded H 3 PW 12 O 40 could then be stripped completely via 3-stage continuous countercurrent stripping by maintaining O:A = 5:1, 65 °C, and t = 5 min. Finally, the obtained strip liquor, containing more than 550 g/L H 3 PW 12 O 40 , was evaporated to obtain crystals, resulting in an increased recovery rate of 10%.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 10
·1811-1818
·
IF 4.239
Hongxing Wang,Guoqiang Ding,Yubo Liu,Junbo Zhang,Yongwang Li,Yulei Zhu
A sustainable and cost-competitive catalytic process for high yield production of levulinic acid (LA) and γ-valerolactone (GVL) from biomass-derived furfuryl alcohol (FOL) fluid was proposed with GVL as a self-circulation solvent. The innovative process eliminated the separation of the final product GVL and intermediate product LA from the solvent, and the actual concentration of FOL was improved enormously. A higher yield (90.5%) of LA was realized in the fixed-bed reactors than that in the conventional autoclave since the short residence time of the FOL solution could alleviate the polymerization of FOL in the continuous process. UV-Raman spectroscopy demonstrated that fewer polymers deposited on the catalysts, so superior stability of the zeolite was observed in the fixed-bed reactors. Moreover, an 89.4% high yield of GVL can be achieved since the integration of the tandem reaction of hydration and hydrogenation could substantially avoid side reactions in the fixed-bed reactors.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Gongxun Zhai,Qianqian Wang,Fuyao Liu,Zexu Hu,Chao Jia,Dengxin Li,Hengxue Xiang,Meifang Zhu
The rapid growth of the demand for carbon nanotubes (CNTs) has greatly promoted their large-scale synthesis and development. However, the continuous production of CNT fibers by floating catalyst chemical vapor deposition (FCCVD) requires a large amount of non-renewable carbon sources. Here, the continuous production of highly graphitized CNT yarns from biomass tannic acid (TA) is reported. The chelation of TA and catalyst promotes the rapid cracking of biomass into carbon source gas, and the pyrolysis cracking produces the reducing gas, which solves the problems of the continuous production of CNT yarns using biomass. Through simple twisting, the mechanical strength of CNT yarn can reach 886 ± 46 MPa, and the electrical conductivity and graphitization ( I G /I D ) can reach 2 × 10 5 S m −1 and 6.3, respectively. This work presents a promising solution for the continuous preparation of CNT yarns based on green raw material.
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Peng Xiao,Bao-Can Dong,Jia Li,Hong-Liang Zhang,Guang-Jin Chen,Chang-Yu Sun,Xing Huang
A continuous process for gas hydrate production is of great significance to hydrate–based technologies. In this study, filtrating hydrate particles from hydrate slurries, which is a key step for continuous hydrate production based on water–in–oil emulsion, was systematically studied. The specific resistances of the hydrate cakes formed from different emulsions and under different pressure drops were measured. The results showed that the specific resistance of the hydrate cake increased with the increase of the pressure drop in two stages, and it increased much more rapidly in the second stage. Increasing the concentrations of Span 20, TBAB and PE would increase the specific resistance. The resistances of the hydrate cakes formed with Span 20 + TBAB were much higher than that with Span 20 or Span 20 + PE. Calculation results suggested that only when TBAB with concentration ≥0.25 wt% was used as the anti–agglomerant, the filtration rate could not meet the requirement of a hypothetical production task. An approach that involves filtration mediums, additives and pressure drops was proposed to efficiently filtrate hydrate slurries for continuous hydrate production. Based on the results, a process for continuous hydrate production from water–in–oil emulsion was proposed.
研究领域:
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today
·
2025
·
IF 22
Jikai Zhang,Yi Tao,Yuxuan Ye,Haiyang Wang,Xinping Wu,Zicheng Luo,Yu Shi,Qi Zhao,Zongju Cheng,Yu Guo,Bin Li,Bo Mai,Qinyou An,Xiansheng Zhang,Zhiguo Du,Shubin Yang
Although 2D transition-metal carbides (MXenes) are usually synthesized by selective etching and chemical vapor deposition approaches, they are limited by the slow reaction kinetics, resulting in their continuous production challenging. Here, we demonstrate a bubbling chemical vapor growth (BCVG) method to continuously produce Cl-terminated MXenes by the reaction of CH 4 and TiCl 4 chemical bubbles with titanium powder in a molten salt. In the molten reaction system, titanium powder would effectively react with TiCl 4 to form highly active [TiCl 6 ] y – with low Ti Cl bond dissociation energies. The multivalent [TiCl 6 ] y – could efficiently incorporate the carbon species from CH 4 to form [Ti 6 CCl 18 ] clusters on the surface of bubbles in a low energy barrier, efficiently promoting the reaction kinetics. Subsequently, Cl-terminated MXenes were produced based on the following condensation reaction of [Ti 6 CCl 18 ] clusters. The resultant MXene (Ti 2 CCl x ) exhibits an expanded structure with strong interfacial polarization between its basal planes and the polymer matrix, delivering a good electromagnetic wave absorption performance with a minimum reflection loss (RL min ) value of –52.2 dB at a thin thickness of 2.84 mm.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Chuanchuan Zhao,Ziyi Zhang,Yaru Liu,Ningzhao Shang,Hai-Jun Wang,Chun Wang,Yongjun Gao
A kind of natural, sustainable, and abundant biomass, chitin, is used as support to load palladium nanoparticles catalyst (Pd–chitin) for the transfer hydrogenation of phenolic compounds to ketones in HCOONa solution. The appropriate reduction temperature in hydrogen atmosphere is a key factor to improve the coordination between oxygen-containing groups and palladium nanoparticle, which prevents palladium nanoparticles leaching during the reaction so that Pd–chitin-150 exhibits good recycling stability. More importantly, Pd–chitin-150 can be fabricated into a PTFE tube with 2 mm inner diameters as a kind of monolithic catalyst, achieving the continuous production of cyclohexanone by feeding the mixture of phenol and HCOONa solution. The functions of sodium introduced during the preparation of catalyst are researched by H2-TPR, CO–DRIFT, and DFT calculations, which facilitate the reduction of palladium and increase the catalytic activity for phenol hydrogenation and selectivity to cyclohexanone.
研究领域:
催化化学
·
生物质材料
·
绿色化学
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Shujing Chen,Qianlong Wang,Maomao Zhang,Ruizhi Huang,Youyuan Huang,Jie Tang,Johan Liu
With the increasing demand on integration and better performance of portable electronics devices, the system operation temperatures are expected to continue to increase, leading eventually to degeneration in functional performance and reliability. Therefore, demand for thermal management materials that effectively spread heat and reduce heat density is urgent. The existing solution of pyrolytic graphite film (PGF) is unsatisfactory due to their low heat flux carrying capacity or low thermal conductivity , as well as poor mechanical performance. This work solves the problem by substituting ultra-thick (≥75 μm) graphene film (GF) for PGF, offering more than three times higher heat flux carrying capacity. The conjugation of large crystallinity and firm structures endows GFs with excellent thermal conductive performance (up to 1204 ± 35 W m −1 K −1 ), great heat flux carrying capacity, and good foldability (5000 cycles folding). In addition to this, such a GF is produced based on an economically efficient and quasi-industrial method incorporating continuous high-pressure homogenization processing (HPH), indicating an enormous potential as a new pathway to thermal management applications.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiuqin Ci,Dong Zhai,Rui Tu,Xiaoju Li,Shuchao Jiang,Xinbo Wang,Weiqiao Deng,Guoqing Ren
CO 2 hydrogenation into formic acid is of great significance to mitigate CO 2 emission. However, conventional routes typically require the addition of unrecyclable bases to shift the reaction equilibrium by the formation of formate, which leads to complex subsequent separation and difficulty in continuous production of pure formic acid solution. Here we report a secondary amine-modified PdMn nanocatalyst for the continuous production of pure formic acid solution in fixed-bed reactors via CO 2 hydrogenation. By optimizing fine structure of PdMn nano-alloy, the optimal TOF of up to 26.5 h −1 is obtained under mild reaction conditions (25 ℃, 3.0 MPa). This is one of the highest levels reported for a heterogeneous catalyst without alkali additives under similar conditions. The characterization shows that the two-component alloying effect of PdMn and the synergistic effect between PdMn NPs and secondary amine group (NH) are the key to obtaining superior reactivity. These findings in this work may pave an avenue for conversion of CO 2 in a more environmentally friendly way.
研究领域:
化学工程
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环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jiandong Cui,Zhanxin Du,Lixue Zhao,Huihui Li,Zhongjie Wang,Zibei Huo,Yingjie Du,Zhaoming Zhang
Yellow water is a kind of Chinese liquor-making wastewater, and contains rich organic components such as alcohols and organic acids , if not treated, it can cause environmental pollution. Herein, continuous aromatic ester production from Chinese liquor yellow water by a packed-bed column bioreactor with immobilized lipase was achieved. Inspired by interface activation of lipase, lipase from Aspergillus oryzae (AOL) was immobilized on LX-1000HA resin with silicone DC1–2577 modification (SH-LX-1000HA) and oleic acid modification (LX-1000HA-NH 2 -OA), respectively. Benefiting from the hydrophobic properties of the surface, the resultant AOL@SH LX-1000HA and AOL@LX-1000HA-NH 2 -OA were 2.3-times and 1.5-times higher activity than that of free AOL, reached 240 U/g and 156 U/g respectively. Meanwhile, the AOL@SH LX-1000HA and AOL@LX-1000HA-NH 2 -OA exhibited higher thermal stability , storage stability, and recyclability than free lipase. Furthermore, the aromatic ester production from yellow water by an packed-bed column bioreactor increased from 1.293 g/L to 3.976 g/L. This efficient continuous bioprocess presents great industrial potential for high value utilization from Chinese liquor yellow water.
研究领域:
生物工程
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 22
·期 16
·5274-5284
·
IF 9.48
Puxiang Yan,Ming Xia,Shanshuai Chen,Wanying Han,Hongliang Wang,Wanbin Zhu
5-Hydroxymethylfurfural (HMF), a versatile biomass derivative building block, is recognized as a bridge between biorefinery and petrorefinery for the production of sustainable fuels and chemicals. Despite extensive research, the industrial production of HMF is far from being realized. The design of novel systems for biomass processing should fully consider the properties of feedstocks and products, and only in this way can we realize the efficient and economical utilization of biomass on industrial scales. Here, we break through the limitations of traditional technologies and report a novel strategy with simple operation, high efficiency, and low cost for HMF production. By the simultaneous circulation of a reaction phase and an extraction phase, and the separation of a HMF extraction process from carbohydrate dehydration conditions, carbohydrates could be continuously and stably dehydrated to HMF in high yields. Over 94 mol% yield of HMF was obtained from fructose and nearly 70 mol% was obtained from glucose, both of which were significantly higher than all reported data obtained in water. Techno-economic analysis demonstrated that HMF could be produced at a minimum selling price of $1716 per ton and $1215 per ton from fructose and glucose, respectively, which brings hope and motivation for the commercial production of HMF.
研究领域:
生物化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 12
·2312736
·
IF 19
Guang Yao,Hongping Xiang,Margaret Lucas,Hang Gao,Lijuan Zheng,Dandan Wu,Zexi Han,Jianhua Lai,Chengyong Wang
Existing manufacturing technologies for thermoset components are limited by long cycle times, simple structures, limited material, and poor controllability, making it difficult to realize complex structures with functionally graded properties. Herein, a sound continuous production (SCP) technology is proposed for the rapid manufacture of thermosets by accelerating the gelation through the mechanical, physical, and chemical effects of ultrasound. SCP is shown to enable the continuous production of homogeneous and heterogeneous thermosets. Its combination with a robotic arm allows for 360° omnidirectional continuous production, which is demonstrated by the successful construction of lateral and vertical-oriented spiral structures via unsupported fabrication. Multiscale filaments with diameters ranging from 150 µm to 2 cm are manufactured and are shown capable of producing functionally graded materials with mechanical property gradients of up to five. The direct fabrication via SCP of a set of functional composites is demonstrated and a novel fabrication technique for multilayer carbon fiber-reinforced plastic laminates is presented. This method can bring technological innovation to the rapid manufacture of thermosets for several emerging fields.
研究领域:
材料科学
·
制造工程
·
超声技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）