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You searched for subject:(pyrolysis pathway). Showing records 1 – 2 of 2 total matches.

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Iowa State University

1. Patwardhan, Pushkaraj Ramchandra. Understanding the product distribution from biomass fast pyrolysis.

Degree: 2010, Iowa State University

Fast pyrolysis of biomass is an attractive route to transform solid biomass into a liquid bio-oil, which has been envisioned as a renewable substitute for crude oil. However, lack of fundamental understanding of the pyrolysis process poses a significant challenge in developing cost-effective pyrolysis based technologies for producing transportation fuels. The fundamental knowledge of pyrolysis pathways, product distribution and underlying mechanisms will have a direct and significant impact on the reactor design, strategic operation and kinetic modeling of the pyrolysis process. However, this knowledge has remained obscure due to the complexity of the pyrolysis process and lack of well established analytical methodologies. The present work provides a systematic approach to study pyrolysis, where many factors that affect the pyrolysis process are decoupled and their effect is systematically studied. The study employs a combination of analytical techniques such as Gas Chromatography - Mass Spectrometry, Gas analysis, Liquid Chromatography - Mass Spectrometry, Capillary Electrophoresis, Ion Chromatography and Gel Permeation Chromatography to identify and quantify the pyrolysis products and establish the mass balance. Pyrolysis involves a complex scheme of reactions consisting of several primary and subsequent secondary reactions. Disassociating primary and secondary reactions is often challenging because of the typical residence time of pyrolysis vapors in the traditional pyrolysis reactors. However, mechanistic understanding of the pyrolysis pathways needs information of the primary pyrolysis products, prior to complex series of secondary reactions. This was achieved by employing a system consisting of a micro-pyrolyzer which had vapor residence time of only a few milliseconds, directly coupled with the analytical equipment. The problem was further simplified by considering the pyrolysis of each individual component of biomass (hemicellulose, cellulose and lignin) one at a time. Influence of minerals and reaction temperature on the primary pyrolysis products was also studied. Secondary reactions, which become important in industrial-scale pyrolysis systems were studied by comparing the cellulose pyrolysis product distribution from micro-pyrolyzer and a bench scale fluidized bed reactor system. The study provides fundamental insights on the pyrolysis pathways of hemicellulose, cellulose and lignin. It shows that the organic components of biomass are fragmented completely into monomeric compounds during pyrolysis. These monomeric compounds re-oligomerize to produce heavy oligomeric compounds and aerosols. It also provides the understanding of the effect of parameters such as presence of minerals and temperature on the resulting product distribution. This knowledge can help tailor the pyrolysis process in order to obtain bio-oil with desired composition. The pyrolysis product distribution data reported in this dissertation can also be used as a basis to build descriptive pyrolysis models that can predict yield of specific…

Subjects/Keywords: bio-oil; fast pyrolysis; mechanism; primary products; product distribution; pyrolysis pathway; Biological Engineering; Chemical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Patwardhan, P. R. (2010). Understanding the product distribution from biomass fast pyrolysis. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/11767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Patwardhan, Pushkaraj Ramchandra. “Understanding the product distribution from biomass fast pyrolysis.” 2010. Thesis, Iowa State University. Accessed August 21, 2019. https://lib.dr.iastate.edu/etd/11767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Patwardhan, Pushkaraj Ramchandra. “Understanding the product distribution from biomass fast pyrolysis.” 2010. Web. 21 Aug 2019.

Vancouver:

Patwardhan PR. Understanding the product distribution from biomass fast pyrolysis. [Internet] [Thesis]. Iowa State University; 2010. [cited 2019 Aug 21]. Available from: https://lib.dr.iastate.edu/etd/11767.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Patwardhan PR. Understanding the product distribution from biomass fast pyrolysis. [Thesis]. Iowa State University; 2010. Available from: https://lib.dr.iastate.edu/etd/11767

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Central Florida

2. Lingam, Balasubramaniam. Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products.

Degree: 2015, University of Central Florida

In this dissertation research, two fundamental studies involving gas chromatography mass spectrometry of n-butylbenzene and pyrolysis products are presented. In the first study, fragmentation pathways of n-butylbenzene in quadrupole ion trap have been investigated. At low energy, product ion corresponding to m/z 92 and m/z 91 are formed via competitive parallel dissociation. Studies have also shown that at higher energy m/z 92 has sufficient internal energy to undergo further fragmentation yielding m/z 91 via consecutive dissociation. Thus in order to discern the fragmentation pathways of n-butylbenzene, the technique of two-dimensional correlation spectroscopy (2DCOS) was applied to the mass spectral data. Application of 2DCOS resulted in two 2D correlation spectra namely synchronous and asynchronous. A third spectra known as coherence spectra was obtained from the ration of asynchronous to synchronous correlation intensities. For the elucidation of n-butylbenzene fragmentation pathways, all the three spectra were utilized in this study. The second study in this dissertation involves investigation of pyrolysis products to aid in fire debris analysis. One of the major concerns in fire debris analysis is that pyrolysis products can mask the patterns of compounds of interest and make the chromatographic results interpretation extremely difficult. One of the approaches for investigating the formation of pyrolysis products is to subject the commonly found building materials to controlled heating in laboratory. In this study, new heating methodologies for controlled heating of substrates involving furnace, paint-cans and flat steel pans have been developed. The substrates used for investigating pyrolysis products were polystyrene, polyvinylchloride, polybutadiene, yellow-pine, nylon carpet and padding. Experiments were also performed to investigate the influence of hydrocarbons on the formation of pyrolysis. Advisors/Committee Members: Sigman, Michael.

Subjects/Keywords: Two dimensional correlation spectroscopy; fragmentation pathway; butylbenzene; fire debris analysis and pyrolysis products; Chemistry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lingam, B. (2015). Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/1278

Chicago Manual of Style (16th Edition):

Lingam, Balasubramaniam. “Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products.” 2015. Doctoral Dissertation, University of Central Florida. Accessed August 21, 2019. https://stars.library.ucf.edu/etd/1278.

MLA Handbook (7th Edition):

Lingam, Balasubramaniam. “Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products.” 2015. Web. 21 Aug 2019.

Vancouver:

Lingam B. Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products. [Internet] [Doctoral dissertation]. University of Central Florida; 2015. [cited 2019 Aug 21]. Available from: https://stars.library.ucf.edu/etd/1278.

Council of Science Editors:

Lingam B. Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products. [Doctoral Dissertation]. University of Central Florida; 2015. Available from: https://stars.library.ucf.edu/etd/1278

.