Gas-liquid acetylene hydrochlorination under nonmercuric catalysis using ionic liquids as reaction media

Qin, G.; Song, Yuhan; Jin, Rui; Shi, Jun; Yu, Zhiyong; Cao, Shaokui

doi:10.1039/c1gc15041c

Cited by 34 publications

(32 citation statements)

References 23 publications

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“…The mercury catalyst (i.e., mercury chloride supported on carbon) plays an important role in producing vinyl chloride monomers through acetylene hydrochlorination. [2] Unfortunately, the mercury catalyst is highly toxic and causes serious environmental problems. To produce 10 3 kg of PVC, approximately 0.12-0.20 kg of mercury is needed.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Doped Pitch‐Based Spherical Active Carbon as a Nonmetal Catalyst for Acetylene Hydrochlorination

et al. 2014

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A highly active nitrogen‐doped pitch‐based spherical activated carbon catalyst (PSAC‐N) is synthesized through a nitrogen‐doping treatment and used as a nonmetal catalyst for acetylene hydrochlorination. The conversion of acetylene on PSAC‐N exceeds 68 % and the selectivity of vinyl chloride is over 99 % at a temperature of 250 °C, an acetylene gas hourly space velocity of 120 h−1, and a feed volume ratio V(HCl)/V(C2H2) of 1.15. DFT calculations performed with Gaussian 09 program package reveal that the active site of PSAC‐N has a N‐6v (quaternary nitrogen bonded between two 6‐membered rings) structure. A seven benzene ring unit model is used in the DFT study. In addition, the reason for inactivation for PSAC‐N catalysts is discussed. Of all the adsorption energies obtained, the adsorption capacity of hydrogen chloride on PSAC‐N is the highest, which indicates strong ability for acetylene hydrochlorination. The reaction mechanism is determined, and the reaction energy of N‐6v(7) calculated as 236.2 kJ mol−1.

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Section: Introductionmentioning

confidence: 99%

Nitrogen‐Doped Pitch‐Based Spherical Active Carbon as a Nonmetal Catalyst for Acetylene Hydrochlorination

et al. 2014

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“…Acetylene hydrochlorination was performed in a vertically double walled 400 mm tall glass reactor. The outer tube had a diameter of 15 mm and inner diameter was 12 mm . the bubble reactor was heated using a cylindrical oil bath.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The system showed both high catalytic activity and stability for C 2 H 2 hydrochlorination. Another advantage of the developed catalytic system was that gas‐liquid system can provide mild temperature control; which is important because the hydrochlorination of C 2 H 2 is a highly exothermic reaction (Δ H = −124.8 kJ.mol −1 ) . Nevertheless, the high viscosity of the ILs limited the mixing of reactants and the transfer of mass and heat.…”

Section: Introductionmentioning

confidence: 99%

Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Yang

et al. 2018

AIChE Journal

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Ionic liquid (IL)‐stabilized metal nanoparticles (NPs) have attracted increased attention as novel catalysts for various reactions due to their excellent stability and high activity. However, the high viscosity of ILs limits their applications. Here, for the first time, we reported an NPs@IL‐cosolvent liquid–liquid biphasic system for metal NPs catalysis. The NPs were successfully confined to IL phase, and abundant IL droplets containing NPs were generated under the reactant flow. The NPs@IL droplets served as microreactors for the catalysis; while the low viscosity organic phase enabled the rapid mass transfer of substances. The biphasic system exhibited improved performance for acetylene hydrochlorination than that of the pure IL system. An acetylene conversion of 98% and a selectivity of 99.5% were achieved along with a 90% decrease on IL usage. The tolerable gas hourly space velocity in the biphasic system for a satisfactory conversion was almost double that of the pure IL system. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2536–2544, 2018

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“…Ionic liquids as reaction media on the acetylene hydrochilorination under mercury-free catalysis was studied by Qin et al 14 They investigated several metal chlorides as catalysts in [Bmim]Cl for acetylene hydrochlorination. The results showed that both HAuCl 4 and H 2 PtCl 6 gave the highest acetylene conversion, which are 78.5% and 79.5%, respectively.…”

Section: Homgeneous Mercury-free Catalystsmentioning

confidence: 99%

Research Progress on Mercury-Free Catalysts for Acetylene Hydrochlorination

Meng¹,

Ding²,

Wang³

et al. 2014

energy environ focus

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Vinyl chloride monomer (VCM) is mainly used for synthesis of polyvinyl chloride (PVC). Two methods are employed for industrial synthesis of vinyl chloride monomer, the hydrochlorination of acetylene and the dehydrochlorination of ethylene dichloride (1,2-dichloroethane). In China, about 70% of VCM products are produced from acetylene hydrochlorination. It is a great challenge to use new-type mercury-free catalysts instead of highly toxic activated carbon supported HgCl 2 catalyst. In this contribution, the progress in research on mercuryfree catalysts for acetylene hydrochlorination is summarized, and the development prospects of mercury-free catalysts are looked forward.

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Gas-liquid acetylene hydrochlorination under nonmercuric catalysis using ionic liquids as reaction media

Abstract: By using ionic liquids as reaction media, gas-liquid acetylene hydrochlorination proceeded efficiently under catalysis of nonmercuric metal chlorides.

Cited by 34 publications

References 23 publications

Nitrogen‐Doped Pitch‐Based Spherical Active Carbon as a Nonmetal Catalyst for Acetylene Hydrochlorination

Nitrogen‐Doped Pitch‐Based Spherical Active Carbon as a Nonmetal Catalyst for Acetylene Hydrochlorination

Metal nanoparticles in ionic liquid‐cosolvent biphasic systems as active catalysts for acetylene hydrochlorination

Research Progress on Mercury-Free Catalysts for Acetylene Hydrochlorination

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