Steam pyrolysis of normal butenes

Conference · Tue Aug 01 04:00:00 EDT 1978 · Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)

OSTI ID:6354840

Leftin, H P

An experimental program is described to provide precise kinetic and product distribution data for the steam pyrolysis of a number of pure olefins. Results for steam pyrolysis of isobutene were reported earlier. The pyrolysis of the three normal butene isomers: 1-butene, cis-2-butene and trans-2-butene is described. Thermal decomposition of 1-butene provides a more complex product spectrum than is obtained from either cis- or trans-2-butenes. In a flow system with nitrogen dilution, methane, propylene, butadiene, and ethylene were major products in addition to hydrogen, ethane, 1-pentene, 2-pentene, 3-methyl-1-butene, and 1,5-hexadiene. While isomerization occurred in all cases, equilibrium isomer distribution was never achieved. There is no general agreement on the kinetics or mechanism of pyrolysis of 1-butene. Activation energies are reported in the range between 59.1 kcal/mole and 7.15 kcal/mole and reaction order with respect to 1-butene of 0.7; 1.0 (9 to 12); 2.0 at low pressures; and different than 1.0 at temperatures below 540/sup 0/C. All of the major products and many minor ones have been identified and their dependence on conersion established. Over the temperature range of this investigation, the calculated first-order rate constants for decomposition of 1-butene decreased with increasing conversion, while calculated second-order rate constants were substantially invariant over the range of conversions from 3% to 99%.

• Research Organization: Pullman Kellogg Research and Development Center, Houston, TX
• OSTI ID: 6354840
• Report Number(s): CONF-780305-P3
• Conference Information: Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Journal Volume: 23:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ACTIVATION ENERGY
ALKENES
BUTENES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CORRELATIONS
DECOMPOSITION
ENERGY
HYDROCARBONS
ORGANIC COMPOUNDS
PYROLYSIS
STEAM
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE
YIELDS