Since Clean Air Act amendments of 1990, heat recovery coke plants are the only metallurgical coke production facilities permitted for construction in the United States. This technology enables coke to be produced from pyrolysis of metallurgical coals with no waste water, no hazardous solid waste, low air emissions and co-generation of electricity. Classic studies of coal to coke conversion reveal an intermediate metaplast stage and yields solid, liquid and gas products. Experimental kinetic and chemical analysis of this process starts from a mass and atomic balance enabling construction of reliable chemical models. Chemical models will be used to explain the effects of operating parameters in heat recovery coke ovens such as coal blends, temperature, heating rate, bed density, etc.