Pyrolytic Behavior of Unsubstituted Aromatic Hydrocarbons

Kinney, Corliss R.; DelBel, Elsio

doi:10.1021/ie50531a042

Cited by 50 publications

(24 citation statements)

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“…Based on the results of the MALDI analyzes of quenched experimental products (Table 1 ) and on the results of previous experimental studies at ambient 37 , 40 and high pressures 18 , 22 , 23 we suggest PT -diagram of coronene oligomerization as well as benzene dimerization curve to 16 GPa and 1000 K (Fig. 5 ).…”

Section: Resultsmentioning

confidence: 55%

Temperature-induced oligomerization of polycyclic aromatic hydrocarbons at ambient and high pressures

Chanyshev

Litasov

Furukawa

et al. 2017

Sci Rep

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Temperature-induced oligomerization of polycyclic aromatic hydrocarbons (PAHs) was found at 500–773 K and ambient and high (3.5 GPa) pressures. The most intensive oligomerization at 1 bar and 3.5 GPa occurs at 740–823 K. PAH carbonization at high pressure is the final stage of oligomerization and occurs as a result of sequential oligomerization and polymerization of the starting material, caused by overlapping of π-orbitals, a decrease of intermolecular distances, and finally the dehydrogenation and polycondensation of benzene rings. Being important for building blocks of life, PAHs and their oligomers can be formed in the interior of the terrestrial planets with radii less than 2270 km.

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Section: Resultsmentioning

confidence: 55%

Temperature-induced oligomerization of polycyclic aromatic hydrocarbons at ambient and high pressures

Chanyshev

Litasov

Furukawa

et al. 2017

Sci Rep

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“…Anthracene Decomposition. The two sources of anthracene decom position data are Dent (3) and Kinney and Delbel (5). The coincidence between decomposition rates during pyrolysis and hydrogenolysis of anthracene, like benzene, also supports the notion that ring destabilization is rate determining.…”

Section: Figure 2 Rates Of Decomposition For Benzene and Anthracenementioning

confidence: 67%

“…(5) In the absence of hydrogen, aromatics are synthesized during pyrolysis of low molecular weight paraffins and olefins; in both cases olefinic intermediates are probably involved. As the ratio of hydrogen to hydrocarbon is increased, the synthesis of aromatics is inhibited; during decomposition of a light paraffinic naptha at 700°C, no aromatic products were formed when the hydrogen-to-hydrocarbon mole ratio exceeded 6.…”

Section: Resultsmentioning

confidence: 99%

Thermal Hydrogasification of Aromatic Compounds

Virk

Chambers

Woebcke

1974

Advances in Chemistry

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The decomposition of simple aromatic molecules is examined to gain insight into possible reaction pathways involved in coal hydrogasification. Experimental data on benzene and anthracene decomposition kinetics in the literature suggest that the rate-determining step involves destabilization of the aromatic ring. Decomposition rates are substantially independent of hydrogen partial pressures from near zero to 100 atm; over this range the dominant product changes from solid carbon (coke) to methane gas. The associated experimental activation energies are proportional to benzene and anthracene delocalization energies as calculated from Dewars theory of odd-alternant hydrocarbons. Carbon-forming reactions and the synthesis of aromatic molecules during pyrolysis of paraffinic hydrocarbons are also studied.Tn synthesizing low sulfur fuels from coal the Stone & Webster process A uses the step-by-step addition of hydrogen to coal under conditions which minimize coke production. The first step involves the conversion of solid coal to a liquid by mild hydrocracking in the presence of a recycle solvent. In the next step these liquids react further with hydrogen under more severe conditions to produce methane, ethane, and aromatics.To obtain favorable reaction rates the product gas must contain some unreacted hydrogen. The synthesis of ethane makes this possible and at the same time meets the objective of a high volumetric heating value. Aromatic liquids are relatively inexpensive to produce since they contain little more hydrogen than coal. Another advantage is that a Btu of liquid is cheaper to transport by pipeline than a Btu of gas.The principal reason for gasifying a portion of the liquefied coal is to make substitute pipeline gas which normally is the primary product. Second, as conversion to gas increases, the quality of the residual liquid 237 Downloaded by NORTH CAROLINA STATE UNIV on October 12, 2012 |

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“…For instance, as the inlet aromatic concentration was increased from 9.1 to 2 1.1 mol % , the asymptotic coking rate increased by 220%. Most probably, the increase in coking rate is due to the formation of unsaturated compounds with the elimination of hydrogen in the condensed ring (Kinney and Del Bel, 1954;Virk et al, 1974). It should be mentioned that at these conditions benzene does not pyrolyse.…”

Section: Effect Of Aromatic Concentrationmentioning

confidence: 99%

Effect of benzene and thiophene on rate of coke formation during naphtha pyrolysis

Sahu

Kunzrw

1988

Can J Chem Eng

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The effect of benzene or thiophene addition to the feed on the rates of coke formation during naphtha pyrolysis has been investigated in a jet‐stirred reactor at atmospheric pressure in the temperature range of 1073‐1103 K. In addition, the effect of temperature, space time, weight ratio of steam to naphtha and the material of construction on the rate of coke deposition was also studied. The rate of coke formation increased as the temperature, space time and aromatic content of the feed was increased whereas it decreased with an increase in the weight ratio of steam to naphtha or the thiophene content of the feed. Addition of thiophene increased the rate of naphtha pyrolysis and significantly reduced the aromatic yields. Rates of coke formation for both thiophene‐free and thiophene‐containing naphtha could be modeled by power law expressions involving the aromatics.

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Pyrolytic Behavior of Unsubstituted Aromatic Hydrocarbons

Cited by 50 publications

References 3 publications

Temperature-induced oligomerization of polycyclic aromatic hydrocarbons at ambient and high pressures

Temperature-induced oligomerization of polycyclic aromatic hydrocarbons at ambient and high pressures

Thermal Hydrogasification of Aromatic Compounds

Effect of benzene and thiophene on rate of coke formation during naphtha pyrolysis

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