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    • 1. 发明授权
    • Method for reducing hydrogen chloride emissions from air-blown asphalt
    • 降低吹气沥青中氯化氢排放的方法
    • US06325986B1
    • 2001-12-04
    • US09667057
    • 2000-09-21
    • Jorge A. MarzariKatherine E. PoterekTimothy T. Picman
    • Jorge A. MarzariKatherine E. PoterekTimothy T. Picman
    • C01B700
    • C10C3/026C10C3/023C10C3/04Y02A50/2327
    • In a method for reducing hydrogen chloride emissions from an asphalt air-blowing process, an asphalt is subjected to an air-blowing process where air is bubbled through hot asphalt to raise the softening point of the asphalt. The fumes from the air-blowing process are bubbled through a liquid seal in a knockout tank before going to an incinerator and finally being emitted to the atmosphere. The knockout tank normally operates to condense oil in the fume stream, and the liquid seal is composed of this oil, as well as some of the water evolved in the air-blowing process. When using ferric chloride or ferrous chloride as a catalyst in the air-blowing process, the fume stream contains significant levels of hydrogen chloride. In this invention, a chemical modifier is added to the process oil and water seal in the knockout tank prior to the start of the process in order to reduce the amount of hydrogen chloride in the emitted fume stream by at least 25% by weight compared to the same process without the addition of the chemical modifier.
    • 在沥青吹风方法中减少氯化氢排放的方法中,对沥青进行吹风过程,其中空气通过热沥青鼓泡以提高沥青的软化点。 来自吹气过程的烟雾在进入焚化炉之前被鼓泡通过敲打罐中的液体密封,最后被排放到大气中。 脱模罐通常用于在烟气流中冷凝油,并且液体密封由该油组成,以及在吹风过程中产生的一些水。 当在吹风过程中使用氯化铁或氯化亚铁作为催化剂时,烟气流含有显着水平的氯化氢。 在本发明中,在开始工艺之前,将化学改性剂加入到脱模罐中的工艺油和水封中,以便将排放的烟气流中的氯化氢的量减少至少25重量%,相比于 相同的工艺没有添加化学改性剂。