Bituminous Coal Pyrolysis Tar as Feedstock for Carbon Black by olr10626


									                                                                   The Pennsylvania State University
                                                                                      209 Academic Projects Building
                                                                                  University Park Pennsylvania 16802

Bituminous Coal Pyrolysis Tar as Feedstock for

Carbon Black Production

                                  A steadily decreasing metallurgical coke production in by-product coke ovens in
                                  the U. S. vis-à-vis the strong demand for coal tar and coal-tar derived carbon
                                  precursors calls for exploring acceptable alternative processes to separate coal
                                  tar production from the parent process of coke-making in by-product coke
                                  ovens. As a possible alternative, steam pyrolysis of bituminous coals was
                                  proposed for the production of raw coal tar, which can be further processed to
                                  produce coal tar products with desired properties.

Project Lead
                                  In this study, steam pyrolysis of four different coal samples (Arch, Amerikohl,
Penn State University
                                  Splash dam and Pocahontas #3) was carried out in a tubular reactor. Steam
209 Academic Projects Bldg
                                  pyrolysis experiments were conducted at four different temperatures (500, 600,
University Park, PA 16802
                                  700 and 800 °C) on all the samples using a steam flow rate of 3g/min at a
                                  constant heating rate of 10 °C/min. The effects of heating rate and steam flow
                                  rate on the product yields and were also studied for different coal samples.
Principal                         Changes in pyrolysis temperature, heating rate, and steam flow rate strongly
Investigator                      affected the tar yields and composition. In general, an intermediate pyrolysis
Semih Eser                        temperature (600°C), an intermediate steam flow rate (3 g/min), and a moderate
                                  heating rate (10 °C/min) gave the highest tar yields.

Other Participants                Benefits
Columbian Chemicals Company       Among the coal samples, Pocahontas #3 gave a much lower tar yield (3-5% wt
                                  on a dry-ash-free basis) than those of the other samples that ranged between 7
                                  and 16 wt% on daf basis. These tar yields are much higher than that obtained
Project Funding                   in by-product coke ovens (2-3%). The tar samples obtained were characterized
DOE              $ 72,205         by high-temperature simulated distillation using gas chromatography (HT Sim-
Non-DOE          $ 74,904         Dis GC) with a capillary column. The atmospheric equivalent boiling points
Total            $ 147,107        (AEBP) distribution of different coal tar samples was determined by using this
                                  method. A commercial coal tar oil sample used for carbon black production was
                                  also analyzed by HT SimDis GC. The atmospheric gas oil and light gas oil
Period of                         fractions are the major constituents (90 %) of this commercial coal tar oil.
Performance                       Among the tar collected from the four different coal samples, Pocahontas tar
                                  contains the least proportion of these two fractions, while Arch and Amerikohl
                                  tars have the largest abundances of these fractions followed by the Splash Dam
                                  coal tar. Steam pyrolysis of Arch and Amerikohl coals would produce raw tars
                                  with high yields of carbon black oils .

                                                                         CPCPC 1999 Project Fact Sheet

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