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| Emission characteristics of volatile organic compounds emitted from an ethylene process unit in petrochemical industry based on blow-through method |
| GAO Jie1,2,3, ZHANG Chun-lin1,2, WANG Bo-guang1,2, ZHANG Zhi-juan1,2, GONG Dao-cheng1,2 |
1. Institute of Atmospheric Environmental Safety and Pollution Control, Jinan University, Guangzhou 510630, China;
2. Guangdong Engineering Research Center for Online Atmospheric Pollution Source Apportionment Mass Spectrometry System, Jinan University, Guangzhou 510630, China;
3. College of environment, Jinan University, Guangzhou 510630, China |
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Abstract Equipment leakage is an important fugitive source of volatile organic compounds (VOCs) in petroleum refined industry. A novel blow-through sampling technique together with a preconcentrator-GC/MS equipment were employed to investigated emission of VOCs from equipment leakage of cracking apparatus (including compressed system, separation system) and aromatic extraction apparatus in an ethylene process unit in south China. The VOCs emitted from the process were mainly composed of alkanes (49.7%~82.4%), alkenes (3.2%~35.7%) and aromatics (5.5%~14.4%). 2-methylpentane, methylcyclopentane, 3-methylhexane and 2,3-dimethylbutane were abundant in the process. Ethylene and trans-2-Butene were discovered to be special species for cracking apparatus, while benzene and methylbenzene were the important ones for aromatic extraction apparatus. Further analysis indicated that alkenes contributed the most to ozone formation potential (OFP), among which ethylene accounted for 47.0%~73.0% to the OFP. According to US EPA Method-21, the leak rate of the light liquid valves was estimated, and the unit-specific correlation between leak rate and concentration was established as y=3×10-7x0.993(R2=0.788).
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Received: 29 June 2015
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