METHOD AND APPARATUS FOR PURIFYING SHALE OIL FROM SOLID IMPURITIES

摘要

The invention is provided for purifying shale oil from solid impurities which have remained in the oil after thermal processing of oil shale. First subject of present invention is a method of purifying shale oil, according to which a composition to be purified is prepared from heavy and medium-light fractions of shale oil and petrol, after which a cyclical purifying process of said composition is carried out. During each cycle said composition is first filtered and the cycles are repeated until to the moment when the effectiveness of filtering becomes lower than required. When this happens, the filter is drained from the composition to be purified and filter cartridges are cleaned. Depending on the percentage of shale oil in a layer built up on cartridges they shall be either only dried using an inert gas having high temperature, after which they are subjected to pneumatic impacts or the above described procedure is preceded by washing of the filter cartridges with petrol. When filter cartridges have been cleaned, an analogous purification cycle follows. Second subject of present invention is an apparatus by means of which it is possible to carry out the above described method.