Fundamentals of coal depolymerization: methodology for the in-situ investigation of free radicals in coal depolymerization under SRC-II preheater/reactor conditions. Quarterly report, October 1-December 31, 1979

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The overall scope of this project is to monitor the free radicals during coal depolymerization under SRC-II preheater/reactor conditions. Understanding the nature and behavior of the free radicals may not only provide significant mechanistic information for the depolymerization of coal, but it could also impact the design of coal liquefaction processes. Our uniquely designed apparatus will allow us to monitor free radicals and how they are affected by, among others, short residence times, temperature and pressure changes. All components of Task I have been completed successfully. Specifically, an experimental design for Task II (screening of main process variables) has been ... continued below

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Pages: 93

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Petrakis, L; Grandy, D W; Ruberto, R G & Carr, N L January 1, 1980.

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Description

The overall scope of this project is to monitor the free radicals during coal depolymerization under SRC-II preheater/reactor conditions. Understanding the nature and behavior of the free radicals may not only provide significant mechanistic information for the depolymerization of coal, but it could also impact the design of coal liquefaction processes. Our uniquely designed apparatus will allow us to monitor free radicals and how they are affected by, among others, short residence times, temperature and pressure changes. All components of Task I have been completed successfully. Specifically, an experimental design for Task II (screening of main process variables) has been developed; a detailed experimental procedure for obtaining data at high pressures and high temperatures has been developed; and the scheme to separate reacted coal has been outlined and tested. As part of the special cavity testing and development of experimental procedure, it was determined that data can be obtained 3 to 4 minutes after the initiation of the heating process to achieve a high temperature (450/sup 0/C). Thus, we expect that we will be able to gain significant information on free radical formation and behavior within the first several minutes of subjecting coal to high temperatures and pressures. The free radical concentration can be measured to +-20%. Preliminary results indicate that some of the process variables may cause several-fold changes in the free radicals. A new Varian Associates instrument has been purchased to carry out this work. The next phase of the work will involve the investigation of temperature and pressure effects, heating rate changes, short residence times and the use of process derived solvent.

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Pages: 93

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Dep. NTIS, PC A05/MF A01.

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  • Report No.: DOE/ET/14940-1
  • Grant Number: AC01-79ET14940
  • DOI: 10.2172/5561716 | External Link
  • Office of Scientific & Technical Information Report Number: 5561716
  • Archival Resource Key: ark:/67531/metadc1092270

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1980

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • March 28, 2018, 12:42 p.m.

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Petrakis, L; Grandy, D W; Ruberto, R G & Carr, N L. Fundamentals of coal depolymerization: methodology for the in-situ investigation of free radicals in coal depolymerization under SRC-II preheater/reactor conditions. Quarterly report, October 1-December 31, 1979, report, January 1, 1980; United States. (digital.library.unt.edu/ark:/67531/metadc1092270/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.