- Nitrogen-Doped Carbon-Assisted One-pot Tandem Reaction for Vinyl Chloride Production via Ethylene Oxychlorination
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A bifunctional catalyst comprising CuCl2/Al2O3 and nitrogen-doped carbon was developed for an efficient one-pot ethylene oxychlorination process to produce vinyl chloride monomer (VCM) up to 76 % yield at 250 °C and under ambient pressure, which is higher than the conventional industrial two-step process (≈50 %) in a single pass. In the second bed, active sites containing N-functional groups on the metal-free N-doped carbon catalyzed both ethylene oxychlorination and ethylene dichloride (EDC) dehydrochlorination under the mild conditions. Benefitting from the bifunctionality of the N-doped carbon, VCM formation was intensified by the surface Cl*-looping of EDC dehydrochlorination and ethylene oxychlorination. Both reactions were enhanced by in situ consumption of surface Cl* by oxychlorination, in which Cl* was generated by EDC dehydrochlorination. This work offers a promising alternative pathway to VCM production via ethylene oxychlorination at mild conditions through a single pass reactor.
- Chen, De,Chen, Qingjun,Fuglerud, Terje,Ma, Guoyan,Ma, Hongfei,Qi, Yanying,Rout, Kumar R.,Wang, Yalan
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supporting information
p. 22080 - 22085
(2020/10/02)
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- An acetylene and methylene chloride coupling reaction for preparing vinyl chloride production dichloroethylene and 1, 1, 2-trichloroethane method of
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The invention relates to a method for preparing vinyl chloride and coproducing dichloroethylene and 1,1,2-trichloroethane by acetylene-dichloromethane coupled reaction, which is characterized by comprising the following steps: mixing acetylene and dichloromethane, and simultaneously carrying out dichloromethane coupled reaction and acetylene hydrochlorination on the acetylene and dichloromethane in a catalyst-filled reactor under the action of the catalyst, wherein the mole ratio of the acetylene to the dichloromethane is 0.5-2.5, the reaction temperature is 200-400 DEG C, the volumetric space velocity of the acetylene-dichloromethane gas mixture is 10-500 h, and the dichloromethane coupled reaction generates dichloroethylene, 1,1,2-trichloroethane and chlorine hydride; and further carrying out acetylene hydrochlorination on the generated chlorine hydride and acetylene to generate vinyl chloride. The method can simultaneously coproduce the dichloroethylene, 1,1,2-trichloroethane and other high-added-value products while producing vinyl chloride, and the process is more economical and has wider industrialization prospects.
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Paragraph 0038; 0039; 0045; 0046
(2017/02/09)
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- INTEGRATED PROCESS FOR PRODUCING 1,2-DICHLOROETHYLENE
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Describes an integrated process for preparing 1,2-dichloroethylenes. In the described process organic feed material, e.g., C2-C4 aliphatic hydrocarbons and/or chlorinated derivatives of such aliphatic hydrocarbons, is introduced into a first reaction zone 10, e.g., a chlorination zone such as an oxychlorination zone, or a thermal cracking zone; first product effluent from the first reaction zone is forwarded to a second reaction zone 9; trichloroethane is introduced into the second reaction zone and into heat exchange contact with the first product effluent from the first reaction zone, which has a heat content sufficient to cause thermal dehydrochlorination of trichloroethane in the second reaction zone; and second product effluent is removed from the second reaction zone. 1,2-dichloroethylene is recovered by conventional distillation recovery methods from the second product effluent.
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Page/Page column 6-7
(2008/06/13)
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- PROCESS FOR PREPARING EPICHLOROHYDRIN FROM ETHANE
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A process for preparing epichlorohydrin comprises (1) converting ethane to 1,2-dichloroethylene (cis/trans mixture) in the presence of a catalyst; (2) producing 2,3-dichloropropanal by (a) hydroformylating the 1,2-- dichloroethylene in the presence of a catalyst, carbon monoxide, and hydrogen, (b) adding MeOH to the 1,2-dichloroethylene, or (c) subjecting the 1,2-dichloroethylene to direct reductive hydroformylation in the presence of a reductive hydroformylation catalyst; and (3) epoxidizing the 2,3-DCH with a base to produce epichlorohydrin.
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Page/Page column 11-12
(2008/06/13)
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- Liquid-Phase Chlorination of Chlorosilyl-substituted Ethylenes and Acetylenes
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The liquid-phase chlorination of bis(chloromethylsilyl)ethylenes and -acetylenes MenQ3-nSiZ · SiMenCl 3-n (n = 0-3; Z = CH=CH, C≡C) was studied. Novel carbochlorosilanes were obtained and characterized. The effe
- Lakhtin,Sheludyakov,Chernyshev
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p. 708 - 710
(2007/10/03)
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- A nonspectroscopic method to determine the photolytic decomposition pathways of 3-chloro-3-alkyldiazirine: Carbene, diazo and rearrangement in excited state
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C60 acts as a mechanistic probe for the formation of carbene, diazo compound, and for the rearranged product via the excited state in the photolysis of 3-chloro-3-isopropyldiazirine and 3-chloro-3-chloromethyldiazirine. The carbene adds to C60 to form methanofullerene, whereas the diazo compound adds to C60 to form fulleroid. The olefin product arises as a result of the rearrangement in the excited state.
- Wakahara, Takatsugu,Niino, Yasuyuki,Kato, Takashi,Maeda, Yutaka,Akasaka, Takeshi,Liu, Michael T. H.,Kobayashi,Nagase
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p. 9465 - 9468
(2007/10/03)
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- Copyrolysis of polychloroethanes
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Pyrolysis of tetrachloroethanes at 713-773 K for a time shorter than 7 s was studied. The rate constants of pyrolysis of pure tetrachloroethanes and their mixtures with penta- and hexachloroethane were compared.
- Bykov,Solyannikov,Berlin
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p. 1595 - 1599
(2007/10/03)
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- Reactions of chlorinated vinylsilanes with hydrogen chloride
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Catalytic hydrochlorination of a series of chloro(chlorovinyl)methylsilanes was studied. The course of the reaction depends on the number and position of the chlorine atoms in the initial monomers.
- Lakhtin, V. G.,Ryabkov, V. L.,Kisin, A. V.,Nosova, V. M.,Chernyshev, E. A.
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p. 375 - 378
(2007/10/03)
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- Liquid-phase chlorination of C-chlorovinylsilanes
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Liquid-phase chlorination of a number of chloro(chlorovinyl)methylsilanes was investigated.A number of novel C-chlorosilanes were characterized by IR and 1H NMR spectra.Some regularities of these reactions were determined: correlations between the structure of chloro(chlorovinyl)methylsilanes and their reactivities were identified. - Key words: chloro(chlorovinyl)methylsilanes; chlorine; chlorination; chloroethylsilanes; C-chlorosilanes; IR spectra; 1H NMR spectra.
- Lakhtin, V. G.,Ryabkov, V. L.,Kisin, A. V.,Nosova, V. M.,Polyakova, M. V.,Chernyshev, E. A.
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p. 2163 - 2167
(2007/10/03)
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- Hydrogen-Atom-Induced Decomposition of Trichloroethylene at High Temperatures
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Mechanisms and rate constants for hydrogen atom attack on trichloroethylene have been determined in single-pulse shock tube experiments near 1050 K.Products from all the decomposition channels have been observed.The predominant process is the displacement of the chlorine at the least substituted site.The following rate expressions have been determined: k(H* + HClC=CCl2 -> H2C=CCl2 + Cl*) = 6 x 1E13 exp(-2439/T) cm3 mol-1 s-1; k(H* + HClC=CCl2 -> HClC=CClH (cis + trans) + Cl*) = 3.7 x 1E13 exp(-3946/T) cm3 mol-1 s-1; k(H* + HClC=CCl2 -> *HC=CCl2 or HClC=CCl* + HCl) = 3.8 x 1E14 exp(-6686/T) cm3 mol-1 s-1.An upper limit for the rate constant of the abstraction process H* + HClC=CCl2 -> *ClC=CCl2 + H2 is 6.5 x 1E10 cm3 mol-1 s-1 at 1050 K.Rate constants for chlorine attack on H2 at these temperatures are a factor of 13 smaller than those on mesitylene.The results are compared with those for hydrogen atom reactions with other unsaturated compounds.Some implications regarding the incineration of chlorinated organics will be discussed.
- Tsang, Wing,Walker, James A.
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p. 3156 - 3161
(2007/10/02)
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- Influence of Supporting Silica Gel on the Catalytic Activity of B-18 Crown Ether-KCl Complex for the Selective Dehydrochlorination of 1,1,2-Trichloroethane
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Catalytic dehydrochlorination of 1,1,2-trichloroethane into 1,1-dichloroethylene proceeded selectively around 200 deg C over dibenzo-18-crown-6-KCl complex supported on silica gels.The reaction rate depended very much on the kinds of silica gel and impregnation levels of the complex, suggesting some roles of surface hydroxyl groups in this catalysis.
- Fujitsu, Hiroshi,Takagi, Takeshi,Mochida, Isao
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p. 1589 - 1590
(2007/10/02)
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