参见词条三氧化硫。又称硫酸酐，硫的高价氧化物,硫酸工业的产品之一。常压和室温下为无色液体，沸点44.8℃。在大气中强烈发烟，形成难以沉降的硫酸雾。与水发生异常剧烈的反应，生成硫酸，并伴有酸雾，同时释出大量热。三氧化硫溶解于 100%硫酸中生成发烟硫酸。三氧化硫在气态时是单体，在液态的时候，单体和三聚体(SO3)3呈平衡状态： 温度愈高，三聚体愈少。
对液体三氧化硫磺化技术的特点进行了概述。
The sulfonation technology of the liquid sulfur trioxide was also reviewed.
叙述了用液体三氧化硫作为磺化助剂的磺化技术，同时，指出了该项技术的优缺点。
This paper described the technique of the sulfonation using the liquid sulfur trioxide as a sulfonating agent. The advantages and disadvantages by using this process were pointed out.
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