China Tobacco Hunan Industrial Corporation

Changsha, China

China Tobacco Hunan Industrial Corporation

Changsha, China
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Tan R.,Hunan Normal University | Li C.,Hunan Normal University | Luo J.,Hunan Normal University | Kong Y.,Hunan Normal University | And 3 more authors.
Journal of Catalysis | Year: 2013

Pristine l-proline was non-covalently loaded on the graphene oxide (GO) sheet in a simple route by mixing them in aqueous solution. Technologies of characterization well suggested that l-proline was efficiently loaded on the two sides and edge of the GO sheet through hydrogen-bonding or/and ionic interaction, giving the excellent l-proline/GO hybrid catalyst for the direct asymmetric aldol reaction. The unique multilayered structure of the GO carrier with sufficient interlayer space favored reagents' diffusion toward l-proline chiral moiety and therefore resulted in the high catalytic efficiency of the heterogeneous l-proline. Excellent yield (96%) with high enantiomeric excess (79% ee) was obtained in the direct aldol reaction of 2-nitrobenzaldehyde with acetone catalyzed by l-proline/GO hybrid, which was comparable to that observed in the reactions promoted by l-proline itself. Furthermore, the l-proline/GO hybrid used as a heterogeneous catalyst could be easily recovered and recycled for seven times without significant loss of the reactivity. © 2012 Elsevier Inc. All rights reserved.


Kong Y.,Hunan Normal University | Tan R.,Hunan Normal University | Zhao L.,Hunan Normal University | Yin D.,Hunan Normal University | Yin D.,China Tobacco Hunan Industrial Corporation
Green Chemistry | Year: 2013

Grafting l-proline on imidazolium-based ionic liquid (IL)-functionalized magnetic nanoparticles afforded a magnetically recoverable l-proline catalyst. Characterization technologies suggested the presence of an l-proline backbone, an IL linker, and a magnetic ferrite core in the catalyst. The resulting l-proline catalyst was efficient for direct asymmetric aldol reaction in water without the need for organic solvents and co-catalysts. Such efficiency is attributed to the fact that the IL moiety facilitated the accessibility of hydrophobic reactants to active sites in water and stabilized the formed enamine intermediate during the reaction. High activity (yield = 92%), diastereoselectivity (dr; 88/12) and enantioselectivity (ee; 85%) were obtained using 10 mol% of a catalyst for the reaction between cyclohexanone and 2-nitrobenzaldehyde within 12 h, where the pristine l-proline and IL-free counterpart were almost inactive. The catalyst was easily separated using a permanent magnet externally and can be reused several times without significant loss of activity. © 2013 The Royal Society of Chemistry.


Tan R.,Hunan Normal University | Dong Y.,Hunan Normal University | Peng M.,Hunan Normal University | Zheng W.,Hunan Normal University | And 2 more authors.
Applied Catalysis A: General | Year: 2013

A series of novel chiral salen Mn(III) complexes possessing a thermoregulated phase-transfer function was prepared for the first time. The preparation involved the introduction of the "smart" poly(N-isopropylacrylamide) (PNIPAAm) group to the framework of the chiral salen Mn(III) complex by covalently connecting to one side of the 5-position in the salen ligand (complex 1) or by axially grafting onto the metal center of the complex (complex 2). Characterization results suggested the presence of the PNIPAAm moiety and active sites in the complexes. The thermoresponsive PNIPAAm groups imparted inverse temperature-dependent water solubility to the PNIPAAm-based complexes, which allowed them to undergo thermoregulated phase-separable catalysis during oxidative kinetic resolution (OKR) in water. Excellent enantioselectivity (up to 96%) with high kinetic resolution efficacy (13.1) was achieved over complex 1 in the aqueous OKR of α-methylbenzyl alcohols, and this efficacy was significantly higher than that obtained over neat complex. The PNIPAAm-based complexes can also be easily recovered by simply regulating the temperature and be reused for four times without obvious loss of enantioselectivity and activity. © 2013 Elsevier B.V. All rights reserved.


Liu C.,Hunan Normal University | Tan R.,Hunan Normal University | Yu N.,Hunan Normal University | Yin D.,Hunan Normal University | Yin D.,China Tobacco Hunan Industrial Corporation
Microporous and Mesoporous Materials | Year: 2010

Pt-Pd bi-metal nanoparticles (bi-MNPs) captured and stabilized by imine groups inside a periodic mesoporous organosilica of SBA-15 (PMO-SBA-15) and their catalytic performances in the hydrogenation of nitrobenzene were investigated. The PMO-SBA-15 was synthesized via a one-pot condensation process by hydrolysis of tetraethoxysilane (TEOS) in the presence of P123 (EO20PO70EO20) involving the assembly of triethylenetetramine silsesquioxane organic precursor. Aqueous PtCl6 2 - and Pd2+ ions were reduced by NaBH4 to form Pt and Pd nanopaprticles, which were captured in real-time by imine groups inside the channels of the PMO-SBA-15 to obtain the sample of Pt-Pd/PMO-SBA-15. The obtained samples were characterized by TG-DTG analysis, FT-IR spectra, XRD, N2 adsorption-desorption measurement and TEM micrograph. The results indicated that both the PMO-SBA-15 and Pt-Pd/PMO-SBA-15 retained the typical characteristics of mesoporous SBA-15 and the dispersed Pt-Pd bi-MNPs well entrapped into the channels of PMO-SBA-15 with the size of ca. 2.5 nm. The MNPs/PMO-SBA-15 was used as a catalyst for hydrogenation of nitrobenzene under 0.1 MPa H2 at 15-60 °C. It was found that the bi-MNPs of Pt and Pd inside the PMO-SBA-15 were more active than the monometallic Pt or Pd nanoparticles due to the synergetic effect and the segregation behavior between Pt and Pd interaction. 100% of nitrobenzene conversion and >99% of selectivity to aniline were obtained over the Pt-Pd/PMO-SBA-15 (Pt:Pd = 1:1) catalyst. Furthermore, the Pt-Pd/PMO-SBA-15 catalyst could be recovered for reuse without significant loss of catalytic activity and selectivity. © 2009 Elsevier Inc. All rights reserved.


Luo R.,Hunan Normal University | Tan R.,Hunan Normal University | Peng Z.,Hunan Normal University | Zheng W.,Hunan Normal University | And 3 more authors.
Journal of Catalysis | Year: 2012

A series of novel chiral salen Mn(III) complexes with inherent phase-transfer capability were prepared by covalent linkage of the limidazolium IL moieties containing various PEG chains with chiral salen ligand at two sides of 5,5′-position. Technologies of characterization well suggested the presence of polyether chain, the IL linker, and the intact active sites in the complexes. The amphipathic nature of the PEG chain allowed the PEG-based catalysts to undergo built-in phase transfer, which in turn increased the reaction rates in water/organic biphasic systems. Enantioselective epoxidation of styrene, α-methylstyrene, indene, 1,2-dihydronaphthalene, 6-cyano-2,2-dimethylchromene, and 6-nitro-2,2-dimethylchromene catalyzed by the complexes with NaOCl gave >99% conversions within 60 min. The enantiomeric excess (ee) for the epoxides was in the range of 68-93%, except for styrene (ee, 35%) and α-methylstyrene (ee, 42%). Furthermore, the PEG-based complexes were stable and could be separated from the reaction mixture by control of the solvent. © 2011 Elsevier Inc. All rights reserved.


Li Y.,CAS Dalian Institute of Chemical Physics | Pang T.,Yunnan Academy of Agricultural Sciences | Guo Z.,China Tobacco Hunan Industrial Corporation | Wang X.,CAS Dalian Institute of Chemical Physics | And 4 more authors.
Talanta | Year: 2010

An accelerated solvent extraction (ASE) procedure has been developed as a pretreatment method for chemical fingerprinting of volatile and semi-volatile components in cut tobacco. The ASE extraction conditions including temperature, operation pressure and extraction cycles were optimized to maximize extraction yield. The method was validated with repeatability, recovery and linearity. Compared with simultaneous distillation extraction (SDE), ASE provides higher extraction yields, less extraction time, lower solvent consumption and less labor time, and is more suitable for tobacco sample preparation. A typical ASE extract was analyzed by gas chromatography/time-of-flight mass spectrometry (GC-TOFMS). A total of 305 components with signal-to-noise ratio higher than 100 were tentatively identified by NIST05 and Wiley database. Finally, 36 cigarette samples from six cigarette brands were analyzed using the developed chemical fingerprinting method. Partial least squares-discriminant analysis shows good discrimination of different cigarette brands. The results indicate that ASE method can serve as high-throughput sample preparation technique for cigarette chemical fingerprint analysis. © 2010 Elsevier B.V. All rights reserved.


Zeng J.-L.,Changsha University | Zhu F.-R.,Changsha University | Yu S.-B.,China Tobacco Hunan Industrial Corporation | Zhu L.,Changsha University | And 5 more authors.
Solar Energy Materials and Solar Cells | Year: 2012

The effects of copper nanowires (Cu NWs) with ultra-high aspect ratio and sponge-like structure on the properties of an organic phase change material (PCM) were investigated. Tetradecanol (TD) was selected as the organic PCM. The sponge-like Cu NWs clusters were randomly dispersed in the TD matrix and were wrapped by TD to form a new kind of composite PCM. The phase change enthalpy (ΔH) of the composite PCMs was decreased linearly with the increasing of Cu NWs loading, while the melting speed was accelerated. The thermal conductivity of the composite PCMs was greatly enhanced by Cu NWs. The ΔH of the composite PCM containing 58.9 wt% (corresponding to 11.9 vol%) of Cu NWs was 86.95 J/g, and the thermal conductivity attained to 2.86 W/m K, which was nearly 9 times higher than that of the TD. The thermal conductivity enhancement of Cu NWs on the composite PCMs showed a turning point at the Cu NWs loading of 1.5 vol%. When Cu NWs loading exceeded 1.5 vol%, the thermal conductivity of the composite PCMs increased significantly faster with the increasing of Cu NWs loading. © 2012 Elsevier B.V.


Zeng J.-L.,Changsha University | Zhu F.-R.,Changsha University | Yu S.-B.,China Tobacco Hunan Industrial Corporation | Xiao Z.-L.,Changsha University | And 5 more authors.
Solar Energy Materials and Solar Cells | Year: 2013

Form-stable phase change materials (PCMs) possess the advantages of direct use without additional encapsulation, making their practical applications more feasible comparing to solid-liquid PCMs. In this paper, a new kind of myristic acid (MA)/polyaniline (PANI) form-stable PCMs were readily prepared by means of surface polymerization method. MA and PANI were applied as thermal energy storage material and supporting material, respectively. Morphology and structure characterization revealed that in the form-stable PCMs, MA particles were wrapped by PANI particles, which in turn were polymerized from aniline. Thermal stability and thermal energy storage properties of the prepared form-stable PCMs were investigated by means of thermogravimetry (TG) and differential scanning calorimetry (DSC). The results indicated that the form-stable PCMs exhibited good thermal stability when their phase change temperature was concerned. The highest loading of MA in the form-stable PCM with good form stability could attain 82 wt%, corresponding to the phase change enthalpy of 150.63 J/g. © 2013 Elsevier B.V.


Zeng J.-L.,Changsha University | Zheng S.-H.,Changsha University | Yu S.-B.,China Tobacco Hunan Industrial Corporation | Zhu F.-R.,Changsha University | And 7 more authors.
Applied Energy | Year: 2014

Exfoliated graphite nanoplatelets (xGnP) were applied to enhance the thermal conductivity of polyaniline (PANI) based form-stable phase change materials (PCMs). The xGnP was first dispersed in palmitic acid (PA) uniformly under the assistance of ultra-sonication. The xGnP/PA mixture was then applied to prepare PA/PANI/xGnP form-stable PCMs, in which PANI was obtained by means of surface polymerization of aniline and acted as supporting material. The content of PA in the prepared form-stable PCMs was fixed as 75. wt%. The structure, thermal energy storage properties and thermal conductivity of the PA/PANI/xGnP form-stable PCMs were investigated. The results showed that the thermal conductivity of the prepared form-stable PCMs could be greatly improved by xGnP while the thermal energy storage capacity was maintained. The thermal conductivity and thermal energy storage capacity of the PA/PANI/xGnP form-stable PCM doped with 7.87. wt% of xGnP could attain 1.08. W/(m. K) and 157.7. J/g, respectively. The thermal conductivity was 237.5% higher than that of PA/PANI form-stable PCM. The prepared PA/PANI/xGnP form-stable PCM is expected to exhibit better performance in solar thermal energy applications. © 2013 Elsevier Ltd.


Patent
China Tobacco Hunan Industrial Corporation | Date: 2012-05-02

Disclosed is a coarse-dust mixing device for adding tobacco dust in the production process of papermaking tobacco sheet, the device includes a vertical stirring drum, a raw slurry inlet (9) and a mixed slurry outlet (16) equipped on the vertical stirring drum (15), a vertical stirring device (13) axially arranged at an upper part of the vertical stirring drum (15), a horizontal stirring device (10) radially installed at the lower part of the vertical stirring drum (15), a coarse-dust hopper (11) connected to the upper part of the said vertical stirring drum (15) via the coarse-dust feeding device (12).Further disclosed is a fine-dust splashing device for adding tobacco dust in the production process of papermaking tobacco sheet, the device includes a feed bin (1) equipped at an upper part of the house (6), a feed-distribution roller (3) corresponding to the feed bin (1) horizontally equipped within the house (6), a fine dust held feed groove (2) arranged on an external surface of the feed-distribution roller (3), a ration controller (8) corresponding to the feed-distribution roller (3) and equipped within the house (6), coating rollers (4,7) acting on the feed-distribution roller (3) and arranged between an outlet (5) of the house (6) and the feed-distribution roller (3).

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