INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Jun Fu,Naimeng Jiang,Dezhang Ren,Zhiyuan Song,Lu Li,Zhibao Huo
A novel process for the conversion of ethylene carbonate (EC) to ethylene glycol (EG) in high temperature water was investigated. As a result, even there is no external catalyst and additive, the reaction of EC proceeded well and provided the desired EG in 99% yield with 25% water filling at 250 °C for 2 h. Moreover, only CO 2 as by-product was observed in the process. High temperature water exhibits an unique merits and plays an catalytic role for EC conversion. From viewpoint of practice, this work provides a simple, environmentally benign, catalyst/additive-free process for the production of ethylene glycol from ethylene carbonate.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Yan Xiao,Lingxia Sun,Qian Ding,Miaoyun Li,Yaodi Zhu,Jong-Hoon Lee,Shengzhao Li,Gaiming Zhao,Yican Wang,Yuying Wang,Lijun Zhao
In the food industry, the emulsifying process alters both the stability and quality of the emulsified products prepared by bovine bone high-temperature hydrolysate (BBHH). The microstructure and interactions of BBHH emulsion were characterized by cryo-scanning electron microscopy (Cryo-SEM) and Raman spectroscopy during emulsification. Notably, BBHH emulsion exhibited the best properties under emulsifying for 120 s, attributed to its interfacial adsorption characteristics. In terms of microstructure, the droplets were small and uniform, and the cross-linking and network structure between the droplet surfaces were obvious at 120 s. Raman spectroscopy indicated that the adsorption of BBHH at the oil-water interface mainly involved an increase of the β-sheet at the expense of the α-helix region. In addition, protein adsorption and structural development at the interface were driven by hydrophobic interactions, while further rearrangement and polymerization were mediated by disulfide bonds. Furthermore, the stability and particle size distribution of the emulsion also supported the results. This study provided a theoretical basis for the behavior of BBHH emulsion formation, which expanded valuable insights into the mechanisms by which liquid food emulsification systems mediated by animal-derived proteins and how they behave under a variety of external conditions.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hang Zhang,Miaomiao Hu,Yun Cheng,Xiaohua Li,Xinyang Zhang,Yujie Ying,Jie Cao,Xiujian Xia,Shusen Zhang,Zhanfu Wei,Jintang Guo
This work proposed an ultra-high temperature set-regulation method to provide a reference scheme for the optimal retarder design of ultra-deep formation oil well cementing slurry. It was found that there was a synergistic retarding effect between 2-acrylamido-2-methylpropanesulfonic acid-based copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid, and the latter could serve as an intensifier for the former to significantly prolong the ultra-high temperature (≥200 ℃) thickening time of cement slurry. The thickening progress mechanism of cement slurry was studied from the perspective of hydration kinetics and mineral content evolution. Results indicated that the content of cement hydration products during the thickening process did not increase gradually and linearly, but increased rapidly within several minutes near thickening time due to the acceleration of hydration. The introduction of intensifier 1-hydroxyethylidene-1,1-diphosphonic acid extended the thickening time by highly delaying the hydration of silicate minerals (C 3 S/C 2 S), while less affected the hydration of aluminate minerals (C 4 AF/C 3 A). Furthermore, the synergistic principle between copolymer retarder and 1-hydroxyethylidene-1,1-diphosphonic acid was proposed from microchemical perspective. Analysis showed that the PO 3 2- was a stronger anchoring group than -COO - and could compensate for the decline of Ca 2+ chelating ability of copolymer retarder caused by decarboxylation and thermal oxidative degradation in ultra-high temperature and alkaline environment, thus further delaying the hydration.
研究领域:
石油工程
·
材料科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 10
·3075-3081
·
IF 8.506
Dezhang Ren,Zhiyuan Song,Lu Li,Yunjie Liu,Fangming Jin,Zhibao Huo
A novel approach for the production of 2,5-hexanedione (HDN) and 3-methyl-2-cyclopenten-1-one (3-MCO) from 5-hydroxymethylfurfural (HMF) by water splitting with Zn is reported for the first time. The use of high temperature water (HTW) conditions is the key for the efficient conversion of HMF to HDN and 3-MCO. Parameters regarding the Zn amount, temperature and reaction time are optimized and HDN and 3-MCO are produced in 27.3% and 30.5% yields, respectively. The roles of HTW and ZnO obtained by oxidation of Zn in water for the conversion of HMF, together with intermediate structures, are discussed to understand the mechanism of the reaction.
研究领域:
化学工程
·
有机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Shaocong Pang,Yang Xuan,Lina Zhu,Yuxiu An
With the advancement of ultra-deep well technology, there has been an increased demand for enhanced high-temperature stability in water-based drilling fluids. To address this challenge, this study has developed a novel polymer nanocomposite (AAND-S) to augment the thermal stability of polymeric fluid loss additives in WBDF. AAND-S was synthesized through aqueous radical polymerization, consisting of zwitterionic polymers with rigid anionic groups and strong cationic adsorption groups, grafted with modified silica nanoparticles. The structure of AAND-S was characterized by infrared and thermogravimetric analyses. The performance of drilling fluids containing AAND-S was evaluated under high-temperature aging conditions at 220 ℃. Notably, the Herschel-Bulkley model provided a more accurate description of the behavior of this non-Newtonian fluid. Specifically, after aging at 220 ℃, the fluid loss of the base mud with AAND-S was reduced to 12.25 mL. Additionally, AAND-S exhibited good salt tolerance up to 25 % NaCl solution. The compatibility of AAND-S was also excellent, enabling it to synergistically interact with other drilling fluid additives to form an efficient drilling fluid system that effectively minimized fluid loss. The mechanism of action of AAND-S was investigated through total organic carbon analysis, zeta potential measurements, and particle size analysis. It was found that AAND-S enhanced the adsorption capacity of bentonite, improving the stability of the colloidal solution and leading to a more uniform particle size distribution. Further SEM microstructural analysis confirmed that the incorporation of AAND-S facilitated the formation of high-quality filter cakes with a dense surface and minimal permeability at elevated temperatures. In conclusion, AAND-S, as a high-performance fluid loss additive, is anticipated to play a significant role in drilling operations in ultra-high temperature formations.
研究领域:
材料科学
·
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Chengxin Li,Zhuwei Gao,Xinyu Qi,Xintong Han,Zhongxin Liu
To control the water pollution caused by industrial oily wastewater, scientific research in the field of oil-water separation has begun all over the world, which has also attracted extensive attention to green advanced separation materials. Herein, we used stainless steel mesh as one of the reactants to load metal oxide particles formed by tetrabutyl titanate (TBT), and manganese acetate on cotton mesh under acidic conditions to prepare a membrane material with excellent oil-water separation. The results showed that the 0.1/0.3/0.5 Mn-TiO2/Fe membranes prepared by high-temperature hydrothermal reaction had an excellent separation effect in the light oil and water separation after 10 cycles, and its maximum oil-water separation efficiency was 89.87%, 92.65% and 96.96% respectively. At the same time, the membrane still had good hydrophobicity after acid, alkali and high temperature and low-temperature treatment. In the light oil and water separation experiment measured after 15 times of friction with sandpaper, the 0.5Mn-TiO2/Fe membrane showed good durability, and the average separation efficiency was 93.82% respectively. This diversified wettability and separation process of stainless steel mesh load on the membrane surface has a wide range of potential applications in environmental protection, energy utilization, industrial manufacturing and so on.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhengda Lin,Yijun Liu,Zhongming Zhang,Jie Yao
In this study we used a high-temperature steam-induced hydrolysis method to obtain a fluorinated OH/SiO 2 -TiO 2 /polyethersulfone (PES) composite hollow fiber membrane for CO 2 capture. The purpose of grafting SiO 2 and TiO 2 on the surface of PES by hydrolyzing silicon precursors and titanium precursors at high temperature, is to improve the alkali corrosion resistance and hydrophobicity of the PES membrane. The OH/SiO 2 -TiO 2 /PES composite hollow fiber membranes prepared by the high-temperature steam-induced hydrolysis method and the graft coating method were measured by SEM, EDS , FTIR, WCA, AFM , XRD and XPS in order to characterize the morphology and structure of the prepared membranes. In the CO 2 /CH 4 separation performance test experiment, the OH/SiO 2 -TiO 2 /PES membrane prepared by the high-temperature steam hydrolysis method showed better separation performance than the original PES membrane. The effects of absorbent flow rate, absorbent concentration and feed gas flow rate on CO 2 flux and CO 2 /CH 4 were selectivity investigated. When the flow rate of the absorbent (DEA) reached 16 L/h, the flow rate of the feed gas (CO 2 /CH 4 = 40 : 60) was 30 ml/min, the concentration of the absorbent was 1 mol/L, The CH 4 concentration was 99.88 % and the optimal separation factor was as high as 554.89. In general, the results obtained in this work may provide promising insights into the use of fluorinated OH/SiO 2 -TiO 2 /PES composite membranes for carbon capture and CO 2 /CH 4 separation in GLMC application.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）