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i <br />Process heaters in the pyrolysis unit will be designed to burn <br />treated fuel gas, liquid Cq's or fuel oil which will be produced <br />in the retorting and upgrading sections of the plant. <br />GAS RECOVERY AND TREATING UNIT <br />In the gas recovery and treating unit, gas and raw naphtha produced <br />in oil recovery, coker, naphtha hydrotreater, and gas oil hydro- <br />treater are separated into fuel gas, LPG, butanes, and a stabili2ed <br />raw naphtha. Fuel gas is used as plant fuel and hydrogen plant <br />feed. LPG is a blend of propane and propylene and will be sold <br />as a product. The butane stream is a mixture of butane and bu- <br />tylene and will be used as plant fuel. Process operations in this <br />unit include oil absorption, solvent contact, and regeneration. <br />There are no discharges into the environment from this unit. <br />• All inputs going into the gas recovery and treating unit will <br />exit to other units or to storage areas, such as LPG. <br />HYDROGEN UNIT <br />Hydrogen will be used in the hydrogenation units to saturate <br />olefins and to remove nitrogen and sulfur from the naphtha and <br />gas oil streams. <br />GAS OIL HYDROGENATION UNIT <br />The gas oil hydrogenation unit treats a mixture of gas oil from <br />the pyrolysis and coker units with hydrogen in the presence of <br />a catalyst to produce a low-nitrogen, low-sulfur gas oil. Sulfur <br />is removed to comply with air quality standards and nitrogen <br />• is eliminated because it is a very potent poison to refining <br />catalysts. The treated gas oil product will be blended with <br />D-14 <br />