Patrick L. Grizzle Oryx Energy Co. Dallas Evaluations by Oryx Energy Co., Dallas, of five reboiler-emissions estimating methods indicate that one employing rich/ lean-glycol mass balance yields excellent estimates of benzene, toluene, ethyl benzene, and xylene (BTEX) and acceptable estimates of total volatile organic compounds (VOCS). The company has confirmed the rich/lean-glycol estimating method from total-capture stack condensation sampling on small glycol units (less than 15 MMscfd) and from partial-stack condensation sampling on large units. BTEX emission data obtained from total-capture condensation and rich/lean mass b...

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