HFC-23 (CHF 3 ) emission trend response to HCFC-22 (CHClF 2 ) production and recent HFC-23 emission abatement measures
HFC-23 (CHF 3 ) emission trend response to HCFC-22 (CHClF 2 ) production and recent HFC-23 emission abatement measures
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DOI：
10.5194/acp-10-7875-2010
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发表时间：
2010-08
影响因子：
6.3
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中科院分区：
文献类型：
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HFC-23（也称为CHF 3、氟仿或三氟甲烷）是一种强效温室气体（GHG），在100年时间范围内的全球变暖潜值（GWP）为14 800。它是HCFC- 22（CHClF 2，氯二氟甲烷）生产过程中不可避免的副产品。HCFC- 22是一种消耗臭氧层物质（ODS），广泛用于商业制冷和空调、挤塑聚苯乙烯（XPS）泡沫塑料行业（分散应用），也用作含氟聚合物制造的原料（非分散用途）。除了特殊用途的小市场外，HFC-23历来被认为是一种废气，过去是，现在仍然是，只是排放到大气层中。在过去二十年中，已经做出了努力来减少HFC-23的排放，包括根据《联合国气候变化框架公约》（UN-FCCC）的清洁发展机制（CDM）在发展中国家的设施中销毁（焚烧），以及通过工艺优化和/或发达国家的大多数生产商自愿焚烧。我们介绍了通过“美杜莎”GC/MSD仪器对在五个远程站点（2007-2009年）的高级全球大气气体实验（AGAGE）网络和开普敦进行的环境空气原位采样中的低对流层HFC-23摩尔分数的观测结果
HFC-23 (also known as CHF3, fluoroform or tri- fluoromethane) is a potent greenhouse gas (GHG), with a global warming potential (GWP) of 14 800 for a 100-year time horizon. It is an unavoidable by-product of HCFC- 22 (CHClF2, chlorodifluoromethane) production. HCFC- 22, an ozone depleting substance (ODS), is used extensively in commercial refrigeration and air conditioning, in the ex- truded polystyrene (XPS) foam industries (dispersive appli- cations) and also as a feedstock in fluoropolymer manufac- ture (a non-dispersive use). Aside from small markets in spe- cialty uses, HFC-23 has historically been considered a waste gas that was, and often still is, simply vented to the atmo- sphere. Efforts have been made in the past two decades to reduce HFC-23 emissions, including destruction (incinera- tion) in facilities in developing countries under the United Nations Framework Convention on Climate Change's (UN- FCCC) Clean Development Mechanism (CDM), and by pro- cess optimization and/or voluntary incineration by most pro- ducers in developed countries. We present observations of lower-tropospheric mole frac- tions of HFC-23 measured by "Medusa" GC/MSD in- struments from ambient air sampled in situ at the Ad- vanced Global Atmospheric Gases Experiment (AGAGE) network of five remote sites (2007-2009) and in Cape