Kinetics of the nonisothermal pyrolysis of propane

A method was devised to yield chemical reaction kinetic parameters from nonisothermal, nonisobaric flow experiments. The system studied was the pyrolysis of propane at high temperatures (800° to 1,000°C.). At these temperatures the rates of the various reactions are so high that a batch or even an isothermal flow experiment is impossible. To keep the conversions low so that the initial stages of decomposition could be studied, the feed gas was diluted with varying amounts of nitrogen. Residence times in the reactor were in the millisecond range. The reactor exit gas was analyzed by mass spectrometry. The method developed in this work is not limited to simple kinetic studies, but can be useful in complicated series and parallel reactions which often require nonisothermal conditions.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/37347/1/690130127_ftp.pd

Kinetics of the non-isothermal pyrolysis of propane

http://deepblue.lib.umich.edu/bitstream/2027.42/5983/5/bac5837.0001.001.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/5983/4/bac5837.0001.001.tx

Integrated production of chemicals and energy

Polygeneration technologies based on synthesis gas allow for the simultaneousproduction of intermediate chemicals and the generation of electricity. The study ofthe integrated production of chemicals and power has different approachesdepending on the products and their demands. This study focuses on the combinedproduction of methanol or dimethyl ether and electricity considering a small tomedium scale production plant to provide chemicals (for applications such astransportation fuel or LPG substitute) and electricity for a small to medium-sizedpopulation. Methanol or dimethyl ether and electricity production were estimated to meet a localtransportation fuel market and off-peak load electricity demand for a small town. The methanol and dimethyl ether synthesis were simulated assuming both asynthesis loop and a once-through configuration. The effect of lower catalyticperformances on the polygeneration system performances was tested in methanoland dimethyl ether production. In addition, direct DME synthesis was assessed atdifferent catalyst loading ratios and also different H2/COx ratios. The flexibility of thecombined systems was studied assuming different approaches to cope with achange on the demand for chemical or electricity. These approaches involvedchanging operating conditions such as the recycle ratio or the synthesis gas feedrate. The feasibility of the polygeneration systems was determined through thecomparison with separate stand-alone configurations for chemical production andpower generation considering requirements of fresh synthesis gas, heating/coolingutilities, and compressor duties. In general, the simulations of the integrated system based on once-throughconfiguration for both MeOH and DME synthesis cases showed lower powerconsumptions and lower fresh synthesis gas requirements compared to theequivalent stand-alone and loop configurations. Finally, the once-throughpolygeneration system is an attractive scheme to produce chemicals and powerbecause of the simplicity of the chemical plant and its lower capital and operatingcosts.EThOS - Electronic Theses Online ServiceUniversidad Cat?lica de la Sant?sima Concepci?nCONICYT-Gobierno de ChileProgramme AlbanGBUnited Kingdo