Vapor−Liquid Equilibria of Systems Containing Dichloromethane and Gaseous Components

Jonasson, Ari; Persson, Ole; Rasmussen, Peter; Astrath, Dirk-Uwe

doi:10.1021/je9902387

Cited by 8 publications

(4 citation statements)

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“… a The CO exchange reaction started under an atmosphere of 13 CO at 743 mmHg total pressure. b Carbonylation reaction of ethyl diazoacetate (EDA) started with [EDA] 0 = [EtOH] 0 = 0.25 mol/dm 3 under an atmosphere of CO. c Calculated from the partial pressure of CO and the known solubility of CO in CH 2 Cl 2 , expressed in mole fraction: x CO (10 °C, 1 bar of P (CO)) = 0.000 473 converted to [CO] = 0.007 489 mol/dm 3 . Solubility of CO in EtOH expressed in mole fraction: x CO (10 °C, 1 bar of P (CO)) = 0.000 487 converted to [CO] = 0.008 438 mol/dm 3 .…”

Section: Resultsmentioning

confidence: 99%

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Triphenylphosphane-Modified Cobalt Catalysts for the Selective Carbonylation of Ethyl Diazoacetate

et al. 2010

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The triphenylphosphane-substituted carbonyl cobalt complexes Co2(CO)7(PPh3), Co2(CO)6(CHCO2Et)(PPh3), and [Co(CO)3(PPh3)2][Co(CO)4] were found to be more effective precatalysts in the carbonylation of ethyl diazoacetate under atmospheric pressure of carbon monoxide at 10 °C in dichloromethane solution than the parent Co2(CO)8 and Co2(CO)7(CHCO2Et) complexes. The highly reactive (ethoxycarbonyl)ketene is the primary product of the catalytic carbonylation, which dimerizes in the absence of a proper scavenger. In the presence of ethanol as the trapping reagent diethyl malonate is the final product of the carbonylation reaction. The formation of (ethoxycarbonyl)ketene using the catalyst precursor Co2(CO)7(PPh3) occurs in a catalytic cycle, where Co2(CO)6(PPh3) and Co2(CO)6(CHCO2Et)(PPh3) are the repeating species. The 16e species Co2(CO)6(PPh3) is involved in the deazotization of ethyl diazoacetate, and Co2(CO)6(CHCO2Et)(PPh3) leads to the (ethoxycarbonyl)ketene formation. In the absence of carbon monoxide or at low CO concentration the reaction of Co2(CO)6(CHCO2Et)(PPh3) with ethyl diazoacetate is the source of Co2(CO)5(CHCO2Et)2(PPh3), which is not an active catalyst for the carbonylation of ethyl diazoacetate. Using [Co(CO)3(PPh3)2][Co(CO)4] as the catalyst precursor, the intermediary formation of [Co(CO)3(PPh3)2][Co(CO)3(OCCHCO2Et)] through radical pairs is assumed. Substituting PPh3 in Co2(CO)7(PPh3), Co2(CO)6(CHCO2Et)(PPh3), and [Co(CO)3(PPh3)2][Co(CO)4] by polymer-bound PPh3 results in active and reusable catalysts for the selective carbonylation of ethyl diazoacetate in dichloromethane solution at 40 °C and 11 bar of pressure with up to 5.1 mol of product/((mol of catalyst) h) turnover frequency.

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Section: Resultsmentioning

confidence: 99%

“… c Calculated from the partial pressure of CO and the known solubility of CO in CH 2 Cl 2 , expressed in mole fraction: x CO (10 °C, 1 bar of P (CO)) = 0.000 473 converted to [CO] = 0.007 489 mol/dm 3 . Solubility of CO in EtOH expressed in mole fraction: x CO (10 °C, 1 bar of P (CO)) = 0.000 487 converted to [CO] = 0.008 438 mol/dm 3 .…”

Section: Resultsmentioning

confidence: 99%

Triphenylphosphane-Modified Cobalt Catalysts for the Selective Carbonylation of Ethyl Diazoacetate

et al. 2010

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“…Ne + Xe [236] Ne + R14 [237] C2H2 + propylene [239] Propylene + R30 [99] Ne + R13 [237] N2 + R14 [238] C2H2 + propyne [239] R13 + R114 [240] significantly restrict the applicability of the present mixture models. To counter this, a subset of 53 binaries was regarded for two to up to four different temperatures.…”

Section: Resultsmentioning

confidence: 99%

Molecular models for 267 binary mixtures validated by vapor–liquid equilibria: A systematic approach

Vrabec

Huang

Hasse

2009

Fluid Phase Equilibria

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“…Dichloromethane and difluoromethane, which have moderate dielectric constants, demonstrate interesting properties despite one being a liquid and the other a gas at RT [307,308]. These polar gases can liquify at LTs or moderate pressures, forming liquefied gas electrolytes that have been utilized in basic studies on ion transport and REDOX phenomena [309][310][311][312]. Cyrus et al researched the potential of hydrofluorocarbons (HFCs) as electrolytes in liquefied gas.…”

Section: Liquefied Gas Electrolytementioning

confidence: 99%

A review on electrode and electrolyte for lithium ion batteries under low temperature

Zheng

Liu

et al. 2023

Electroanalysis

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Under low temperature (LT) conditions (−80 °C∼0 °C), lithium‐ion batteries (LIBs) may experience the formation of an extensive solid electrolyte interface (SEI), which can cause a series of detrimental effects such as Li+ deposition and irregular dendritic filament growth on the electrolyte surface. These issues ultimately lead to the degradation of the LT performance of LIBs. As a result, new electrode/electrolyte materials are necessary to address these challenges and enable the proper functioning of LIBs at LT. Given that most electrochemical reactions in lithium‐ion batteries occur at the electrode/electrolyte interface, finding solutions to mitigate the negative impact caused by SEI is crucial to improve the LT performance of LIBs. In this article, we analyze and summarize the recent studies on electrode and electrolyte materials for low temperature lithium‐ion batteries (LIBs). These materials include both metallic materials like tin, manganese, and cobalt, as well as non‐metallic materials such as graphite and graphene. Modified materials, such as those with nano or alloying characteristics, generally exhibit better properties than raw materials. For instance, Sn nanowire‐Si nanoparticles (SiNPs−In‐SnNWs) and tin dioxide carbon nanotubes (SnO2@CNT) have faster Li+ transport rates and higher reversible capacity at LT. However, it′s important to note that when operating under LT, the electrolyte may solidify, leading to difficulty in Li+ transmission. The compatibility between the electrolyte and electrode can affect the formation of the solid electrolyte interphase (SEI) and the stability of the electrode/electrolyte system. Therefore, a good electrode/electrolyte system is crucial for successful operation of LIBs at LT.

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Vapor−Liquid Equilibria of Systems Containing Dichloromethane and Gaseous Components

Cited by 8 publications

References 4 publications

Triphenylphosphane-Modified Cobalt Catalysts for the Selective Carbonylation of Ethyl Diazoacetate

Triphenylphosphane-Modified Cobalt Catalysts for the Selective Carbonylation of Ethyl Diazoacetate

Molecular models for 267 binary mixtures validated by vapor–liquid equilibria: A systematic approach

A review on electrode and electrolyte for lithium ion batteries under low temperature

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