Aromatic hydrocarbon

About: Aromatic hydrocarbon is a research topic. Over the lifetime, 5814 publications have been published within this topic receiving 55499 citations. The topic is also known as: arene & arenes.

Method of making novel rubbery block copolymers and pressure-sensitive adhesives

Abstract: Rubbery coupled conjugated diene/monovinyl-substituted aromatic hydrocarbon teleblock copolymers are prepared by incremental addition of both monovinyl-substituted aromatic hydrocarbon and initiator. The resulting copolymers can be used to produce improved pressure-sensitive adhesives.

Manufacture of complex hydrides

Abstract: A process for the preparation of alkali metal aluminum hydrides including reacting aluminum and an alkali metal or alkali metal hydride with hydrogen at elevated temperatures and under super atmospheric pressure in the presence of an aliphatic or aromatic hydrocarbon.

Phase boundary process for the preparation of aromatic polycarbonates using a chlorinated aromatic hydrocarbon as the polymer solvent

Abstract: The present invention provides a process for the preparation of a polycarbonate by the phase boundary condensation method, by phosgenation of an aqueous alkali metal salt solution of one or more aromatic dihydroxy compounds, in which process an aromatic chlorinated hydrocarbon is used as the solvent and the synthesis of the polycarbonate is carried out in two stages, in the first stage of which the reaction of the alkali metal salt solution of the aromatic dihydroxy compound(s) with phosgene is carried out at an OH concentration of between 0.01 and 0.1% by weight of OH, relative to the aqueous phase, in the presence of 0.1 to 2.5 mol% of trialkylamine, relative to aromatic dihydroxy compound(s), and at a temperature higher than 70° C, with a dwell time of less than 5 minutes, while in the second stage the polycondensation is effected by adjusting the OH concentration to 0.20 to 0.50% by weight of OH, relative to the aqueous phase, optionally with further addition of trialkylamine, at a temperature higher than 80° C and with a dwell time of more than 1 minute.

Polycyclic aromatic hydrocarbons from the co-pyrolysis of catechol and propyne

Abstract: In order to investigate C 3 species as potential participants in aromatic-ring-growth reactions of polycyclic aromatic hydrocarbons (PAH) from solid fuels, we have performed pyrolysis experiments in an isothermal laminar-flow reactor (at temperatures, 700–1000 °C; residence time, 0.3 s) with the C 3 hydrocarbon propyne, the model fuel catechol (representative of aromatic moieties in coal and biomass), and with propyne and catechol together (in a catechol-to-propyne molar ratio of 0.938). Analysis of the 1000-°C reaction products of propyne – by high-pressure liquid chromatography with diode-array ultraviolet-visible absorbance detection – has led to the identification of 58 two- to eight-ring PAH that have never before been reported as products of propyne pyrolysis or combustion. At all temperatures except 1000 °C, however, propyne-only pyrolysis produces very low yields of PAH – a consequence of low propyne (and propadiene) conversion and high production of benzene, which remains relatively invulnerable to ring-growth reactions. Catechol-only pyrolysis, in contrast, produces fairly high yields of PAH (up to 5.6% on a %-fed-carbon basis) – a result of catechol’s high production of effective C 2 and C 4 growth species as well as a rich radical pool that accelerates fuel conversion and aromatic-ring-growth reactions. When catechol and propyne are co-pyrolyzed, the radical pool provided by catechol causes a dramatic acceleration of propyne’s decomposition to methyl and acetylene – shifting the small-hydrocarbon product distribution from one that is rich in C 3 species to one that is rich in C 2 species. The 1- and 2-ring aromatic hydrocarbon product distribution also shifts from one dominated by unreactive benzene to one having more substituted species, more reactive to ring-growth. The net result of these shifts is a tremendous boost in PAH production: At all temperatures >800 °C, PAH yields from the co-pyrolysis experiments are 2.5–2.8 times higher than what would result from the two fuels being pyrolyzed independently.