The words contained in this file might help you see if this file matches what you are looking for:

...Petroleum refining industry product gd and introduction measurement of hydrogen purity throughout a system allows the u s refineries represent approximately percent for efficient control process world production united states has gas density can be measured in various portions during largest capacity is an which undergoing intense amounts scrutiny from regulatory agencies environmental groups as result releases pollutants i hydrotreating caused by corrosion leaks are becoming high ii catalytic reformer consequence event clean air act forced iii input refiners to implement number costly measures reduce iv hydrocracking their impact on environment both with types v recycled products they produce manner operate vi fuel specific gravity vii purification viii off step one where hydrotreators or hds hydrodesulfurization units remove sulfur distillation like naphtha diesel oils before reforming this sweetening reduces so emissions when burned protects catalysts used down stream reformers carr...