نتایج جستجو برای: butene
تعداد نتایج: 827 فیلتر نتایج به سال:
ABSTRACT An earlier developed alkylating path leading to tetraalkylated diaminomaleonitrile derivatives was explored. Attempts to explain the reactivity of the representative dialkylated diaminomaleonitrile 2,3-bis[(3-pyridylmethyl)amino]-2(Z)-butene-1,4-dinitrile during the alkylation reaction were performed using X-ray and density functional theory (DFT) studies. The condensed Fukui functions...
In the present work, we have evaluated whether isomeric C5-alkene diols (1,2-dihydroxy-2-methyl-3-butene, 1,2-dihydroxy-3-methyl-3-butene, and 1,4-dihydroxy-2-methyl-2-butene (cis + trans)), which have first been detected upon photooxidation of isoprene in the absence of NO and are known to be formed in the ambient atmosphere, can serve as precursors for the 2-methyltetrols, C5-alkene triols, a...
Butene-1 is produced from ethylene by dimerization reaction in a CSTR. Due to the exothermic reaction, serious temperature runaway occurs in the reactor. Therefore, it is important to stabilize the reaction temperature in order to maintain good quality product and safe operation. Temperature stabilization is also essential for maintaining optimal operation of high ethylene conversion and desire...
Molecular dynamics simulations of the diffusion of trans-2-butene in zeolite type MEL at 623 K have revealed an initial increase of the self-diffusivity with increasing loading, in contrast to simulation data collected for the other butene isomers. This is usually the signature of repulsive guest-guest interactions. At higher loadings, however, the concentration dependence was shown to decrease...
Abstract Hydrodesulfurization of thiophene has been studied over alumina supported sulfided molybdena, nickel-promoted molybdena and nickel (Mo, NiMo Ni) catalysts. The experiments were carried out with a mixture thiophene, labeled radioactive carbon (thiophene-[G-]- 14 C) non-radioactive tetrahydrothiophene (1:1 mol ratio) in micro catalytic system. It was established, that the main products t...
The rheology of linear and branched metallocene polyethylenes (m-PEs) was investigated. The linear metallocenes were prepared by gas-phase polymerization, while the branched PEs were commercial resins. Molecular parameters such as Mw, branch type, and molecular weight distribution have influenced the viscoelastic behavior of both linear and branched PEs, whereas branch content (BC) had little i...
In the present work, we have investigated the conformational isomerism and calculated the vibrational spectra of the C4 oxygenates: 3-butyne-2-one, 3-butene-2-one, 2-butanone and 2-butanol using density functional theory. The calculations are validated by comparison to structural data where available and new, experimental inelastic neutron scattering and infrared spectra of the compounds. We fi...
In the present research, the titanium-catalyzed ethylene dimerization and more specifically, the concomitant byproducts and polymer formation have been studied in the presence of 2,5-dimethoxytetrahydrofuran as an electron donor compound in the combination with triethylaluminium (TEA) as activator. Then, we added ethylene chlorobromide as a new efficient promoter to the relevant catalyst system...
The possibility of separating divinyl from the butene-divinyl fraction by method extractive distillation is considered. A comparative evaluation process was performed using methanol and acetonitrile as agents
Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Piia Haimi Name of the doctoral dissertation Vapour liquid equilibrium measurements with three methods: static total pressure, circulation still and inert gas stripping Publisher School of Chemical Technology Unit Department of Biotechnology and Chemical Technology Series Aalto University publication series DOCTORAL DISSERTATI...
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