Modeling chemical and physical processes of wood and biomass pyrolysis

Modelling and experimental verification of physical and chemical processes during pyrolysis of a large biomass particle

The molecular representations of coal – A review

Studies on the effect of size, structure, environment, temperature, heating rate, composition of biomass and ash are reviewed. Based on the observations reported so far, auto-gasification of biomass by the bio-oxygen and the catalytic ash would be feasible. The auto-gasification may be explained in terms of heterogeneous catalytic reaction. Better understanding of auto-gasification is possible by further studies carrying out on the effect of heating rate on auto-gasification.

A review on gasification of biomass

Heat transfer and kinetics in the low temperature pyrolysis of solids

A mathematical model based on unreacted-core shrinking model is developed to describe the pyrolysis phenomena of the cellulosic materials in the temperature range of 700–1470 °K. The relative importance of each model parameter is studied by applying the sensitivity analysis. The heat transfer control region and kinetic reaction control region are obtained from the developed model. The shift of controlling mechanism is dependent on the particle size and the wall temperature. The effect of heat of reaction on the temperature of the particle is also discussed.

Influence of particle sizes and environmental conditions on high temperature pyrolysis of cellulosic material. I. Theoretical

Sulphur transformation and removal for Western Kentucky coals

Char fines produced by the gasification of coal or other carbonaceous solids are coked in the presence of heavy hydrocarbon oils, preferably 1000° F.+ bottoms products from a coal liquefaction process, to produce gaseous products, liquids, and larger coke particles. The coke particles thus produced may be fed to the gasifier for the production of additional gaseous products which can be used as fuel, employed as a source of hydrogen for coal liquefaction operations, or utilized for the production of hydrocarbon liquids.

Integrated process for the production of hydrocarbons from coal or the like in which fines from gasifier are coked with heavy hydrocarbon oil

An isotopic study utilizing methane- 13 C shows that the product toluene and xylenes formed from its reaction at high pressure (5.5 MPa, 400 °C) with benzene, over Cu/beta and H-beta zeolites, contain substantially methyl- 13 C substituents. It is therefore concluded that direct methylation of benzene with methane is possible under these conditions in a batch reactor. However, a second mechanism can also be recognized in which methylbenzene is formed by fragmentation and rearrangement of benzene without addition of methane gas.

Peter S. Maa

Papers

Influence of particle sizes and environmental conditions on high temperature pyrolysis of cellulosic material. I. Theoretical

Sulphur transformation and removal for Western Kentucky coals

Integrated process for the production of hydrocarbons from coal or the like in which fines from gasifier are coked with heavy hydrocarbon oil

Methylation of Benzene by Methane-13C over Zeolitic Catalysts at 400 .degree.C

Organic oxygen determination of kentucky no.9 coal by fast-neutron activation analysis