Surface effects during pyrolysis of normal and iso-butanes using a continuous flow thermal gravimetric reactor

Thesis/Dissertation · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6930109

Chen, C T

The purpose of the study was to examine the coke structures, coking rates and surface effects during the pyrolysis of butane and isobutane. Several types of surfaces were investigated such as stainless steel 304, quartz, Incoloy 800 and Alonized 800, and polished and pretreated (by hydrogen sulfide) surfaces. A coking model with a coke decay coefficient was developed to represent coke formation on the surface of a S. S. 304 coupon. Surface conditions influenced the coke formation significantly. The polished surface was found to be an excellent means to reduce coke formation. A hydrogen sulfide pretreated surface inhibited coke formation too. Alonized 800 retarded coke formation, effectively, due to the addition of Al on the Incoloy 800 surface. The coking rate was rapid during an initial growth period, then reduced to a steady level. A coke decay coefficient was found to be the same for the coking model for butane and isobutane. Coke structures were similar under the same operating conditions for the pyrolysis of butane and isobutane. Filamentous carbon predominated on the surface of S. S. 304. Amorphous carbon was the major product on the surface of Incoloy 800. A three-halves order was estimated to be the global reaction of butane and isobutane pyrolyses.

• Research Organization: Oklahoma State Univ., Stillwater (USA)
• OSTI ID: 6930109
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
2-METHYLPROPANE
PYROLYSIS
BUTANE
INCOLOY 800
CATALYTIC EFFECTS
QUARTZ
STAINLESS STEEL-304
CATALYSIS
ALKANES
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
DECOMPOSITION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROCARBONS
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MINERALS
NICKEL ALLOYS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SILICON OXIDES
STAINLESS STEELS
STEELS
THERMOCHEMICAL PROCESSES
090110* - Hydrocarbon Fuels- Properties- (1979-1989)