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INTRODUCT I ON 3 PROJECT APPROACH 5 DESCRIPTION OF THE PROCESS RESEARCH UNIT 7 DESCRIPTION OF THE MILD GASIFICATION TESTS AND PRU MODIFICATIONS 15 Test Coals 15 Shakedown Operations 15 Mild Gasification Tests 21 DISCUSSION OF PRU TEST RESULTS 39 93 Chemical Properties of Oils/Tars. 93 Reproducibility of Data I01 Reactor/Process Configuration 104 CONCLUSIONS 1,07 REFERENCES CITED iii LIST OF FIGURES Fibre NO. 1 Schematic Diagram of PRU System 8 2 Isometric View of PRU System 9 3 Slipstream Sampling System ii 4 Control Room Panel With Data Acquisition/ Control System 12 5 Fluidization Grid Modifications 31 6 Effect of Mild Gasification Temperature on Co-Product Yields 84 7 Effect of Mild Gasification Temperature on the Boiling-Point Fractions of Oils/Tars 85 8 Effect of Mild Gasification Temperature on the Heteroatoms in Oils/Tars 86 9 Effect of Mild Gasification Temperature on the H/C Atomic Ratio in Oils/Tars 87 i0 Effect of Mild Gasification Temperature on Ash, Volatile Matter, and Sulfur Content of Char 88 ii Effect of Mild Gasification Temperature on Gas Composition 89 12 FIMS Spectrum of Test MG-3 Solvent Quench Tar 90 13 FIMS Spectrum of Test MG-3 THF Wash Tar 97 14 Vacuum Distillation Curve for Test MG-3 Solvent Quench Tar 98 15 Vacuum Distillation Curve for Test MG-3 THF Wash Tar 99 ].6 H-NMR Spectrum of Test MG-25 Oils/Tars i01 vi LIST OF TABLES Table No.