METHOD OF A SURFACE CLEANING FROM HYDROCARBON POLLUTIONS Russian patent published in 2005 - IPC

FIELD: different branches of industry; methods of cleaning of surfaces from hydrocarbon pollutions.

SUBSTANCE: the invention is pertaining to methods of cleaning of surfaces from hydrocarbon pollutions such as petroleum, oil products, lubricants, oils, technical and household fats and may be used in different branches of industry for mechanized washing and cleaning of the equipment and materials pipelines. The method includes delivery of a working medium in the form of a stream onto the treated surface and removal from the zone of treatment of products of cleansing, separation of even a part of hydrocarbon layer and the watered slimes from them and return for re-use of at least a part of the products of cleansing. In the beginning (the first stage) for warming up and removal of the main mass of hydrocarbon pollutions in the capacity of a working medium they use the heated products of cleansing, that are representing a multiphase and multi-component mixture formed as a result of the previous fettling, where in the capacity of a disperse medium use a water, losses of which with the steams separated by encroached hydrocarbonaceous layer and the removed amount of watered slimes are refilled. The final treatment (the second stage) is exercised by the circulating and preliminary purified from the seized pollutions washing agent, in the capacity of which use water, or a water solution of surfactants. At that and in accordance with decrease of quality of the washing agent a part of it is directed to compensate of the losses of water in the working medium, and in exchange add a corresponding amount of pure water or a just prepared water solution. The invention ensures a significant reduction of consumption of the circulating washing agent, that allows to reduce the time of treatment and consumption of surfactants without decrease of the quality of a cleaning of surface and to reduce the sizes of the separation equipment, and also ensures removal of the accumulated soaps for prevention of pollution of the atmosphere by vapors of hydrocarbons, utilization of a slime and to decrease a water encroachment of the separated hydrocarbons by up to 2 %.

EFFECT: the invention allows to reduce consumption of the circulating washing agent, surfactants without decrease of the quality of a cleaning of surfaces, to reduce the time of treatment and sizes of the separation equipment, to prevent pollution of the atmosphere.

10 cl, 1 dwg