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在国外焦化厂或冶金工厂中污水初步除害(脱酚)是采用萃取法或所谓蒸汽循环的方法来实现。萃取法最初是在欧洲(西德、波兰、捷克)得到广泛应用。在美国则普遍应用蒸汽法,然而,近年来已有转向萃取法的趋势,并用苯或其它溶剂作为萃取剂来脱酚。1960年在西德的鲁尔煤矿区筹建了29台脱酚设备,现今则有20台萃取设备在运转,这些都是在战后重新建立的。在西德关于焦化工厂污水脱酚方法的文章中详细报导了所谓苯碱法(或称之为Потта和Гильгеншток法)自应用于工业后到现在为止的发展方向。还指出尽管可能应用效率较高的溶剂,但即使当前来讲,苯碱法也并未失去意义。
In foreign coking plants or metallurgical plants in the initial removal of sewage (phenol) is the use of extraction or so-called steam cycle method to achieve. Extraction method was first widely used in Europe (West Germany, Poland, Czech Republic). In the United States, steam is commonly used. However, in recent years, there has been a shift to the extraction process and the use of benzene or other solvents as extractants to remove phenol. In 1960, 29 de-phenol equipment was prepared in the Ruhr coal mine in West Germany and now 20 extraction equipment is in operation, all of which were re-established after the war. The development of the so-called benzene-base method (or the so-called Потта and Гильгеншток method) since its application in industry has been reported in detail in the West German article on methods for the de-phenololysis of coking plants. It was also pointed out that even though more efficient solvents may be used, the alkalimetry is not meaningless even now.