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Title: Comparison of isothermal and nonisothermal pyrolysis data with various rate mechanisms: Implications for kerogen structure

Abstract

In order to derive chemical kinetic rate constants that can be extrapolated over a wide range of reaction conditions, it is usually necessary to fit the kinetic data to a model that accounts for important aspects of the reaction mechanism. Kerogen pyrolysis is an extremely complicated process, so it is impossible to consider individual reactions. Therefore, the goal is to construct a global reaction model in which important stages of reaction and classes of reactions are treated by a single rate expression. Two global reaction models that have been used frequently for kerogen pyrolysis are the multiple-parallel reaction model and the kerogen-to-bitumen-to-oil serial reaction model. While these models may be able to describe some aspects of kerogen pyrolysis, they give fundamentally different predictions for certain aspects of oil generation. The purpose of this paper is to examine kerogen pyrolysis under conditions where the differences between these models can be tested. They find that both models have significant weaknesses. They discuss the implications of their results for the structure of kerogens, and they attempt to derive more realistic global models that take these possible structures into account. One promising model is the alternate pathway model.

Authors:
; ; ;  [1]
  1. (Lawrence Livermore National Lab., CA (USA))
Publication Date:
OSTI Identifier:
5433420
Report Number(s):
CONF-8904125-
Journal ID: ISSN 0569-3799; CODEN: ACPCA
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Journal Name:
American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States)
Additional Journal Information:
Journal Volume: 34:1; Conference: Comparative studies of various shale oils symposium, Dallas, TX (United States), 9-14 Apr 1989; Journal ID: ISSN 0569-3799
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 04 OIL SHALES AND TAR SANDS; 58 GEOSCIENCES; KEROGEN; PYROLYSIS; BITUMENS; CHEMICAL REACTION KINETICS; GEOCHEMISTRY; MATHEMATICAL MODELS; STRUCTURAL CHEMICAL ANALYSIS; BITUMINOUS MATERIALS; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; CHEMISTRY; DECOMPOSITION; KINETICS; MATERIALS; MATTER; ORGANIC COMPOUNDS; ORGANIC MATTER; OTHER ORGANIC COMPOUNDS; REACTION KINETICS; TAR; THERMOCHEMICAL PROCESSES; 023000* - Petroleum- Properties & Composition; 040500 - Oil Shales & Tar Sands- Properties & Composition; 580000 - Geosciences

Citation Formats

Burnham, A.K., Braun, R.L., Taylor, R.W., and Coburn, T.T. Comparison of isothermal and nonisothermal pyrolysis data with various rate mechanisms: Implications for kerogen structure. United States: N. p., 1989. Web.
Burnham, A.K., Braun, R.L., Taylor, R.W., & Coburn, T.T. Comparison of isothermal and nonisothermal pyrolysis data with various rate mechanisms: Implications for kerogen structure. United States.
Burnham, A.K., Braun, R.L., Taylor, R.W., and Coburn, T.T. Wed . "Comparison of isothermal and nonisothermal pyrolysis data with various rate mechanisms: Implications for kerogen structure". United States.
@article{osti_5433420,
title = {Comparison of isothermal and nonisothermal pyrolysis data with various rate mechanisms: Implications for kerogen structure},
author = {Burnham, A.K. and Braun, R.L. and Taylor, R.W. and Coburn, T.T.},
abstractNote = {In order to derive chemical kinetic rate constants that can be extrapolated over a wide range of reaction conditions, it is usually necessary to fit the kinetic data to a model that accounts for important aspects of the reaction mechanism. Kerogen pyrolysis is an extremely complicated process, so it is impossible to consider individual reactions. Therefore, the goal is to construct a global reaction model in which important stages of reaction and classes of reactions are treated by a single rate expression. Two global reaction models that have been used frequently for kerogen pyrolysis are the multiple-parallel reaction model and the kerogen-to-bitumen-to-oil serial reaction model. While these models may be able to describe some aspects of kerogen pyrolysis, they give fundamentally different predictions for certain aspects of oil generation. The purpose of this paper is to examine kerogen pyrolysis under conditions where the differences between these models can be tested. They find that both models have significant weaknesses. They discuss the implications of their results for the structure of kerogens, and they attempt to derive more realistic global models that take these possible structures into account. One promising model is the alternate pathway model.},
doi = {},
journal = {American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States)},
issn = {0569-3799},
number = ,
volume = 34:1,
place = {United States},
year = {1989},
month = {3}
}

Conference:
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